b

Packaging box with test strips and gripper assembly thereof

A packaging box with test strips is provided for a gripper to grip the test strips, and the gripper has a gripping section and a conductive terminal in the gripping section, and the packaging box includes a main body and a test strip. The main body has an embedded groove including a port with a shape corresponding to the shape of the gripping section, and the port is provided for inserting the gripping section. The test strip has a conductive area defined on a surface of the test strip, and the test strip is contained in the embedded groove, wherein the gripping section is coupled to the port, and the conductive terminal is electrically coupled to the conductive area. With the packaging box, the test strips can be taken out conveniently and quickly.




b

Multifunctional case for portable electronic device

A multifunctional case is configured for receiving or supporting a portable electronic device. The case includes a first layer and a second layer. The second layer is connected to the first layer by the edges. A receiving space is formed between the first and second layers for receiving the portable electronic device. The second layer is provided with a base portion, a main supporting portion, two side supporting portions and two remaining portions are formed on the second layer. The two side supporting portions and the remaining portions are symmetrically positioned at two sides of the main supporting portion. When the case is folded up as a support, the main supporting portion is angled with the base portion. The remaining portions are stacked on the base portion. The side supporting portions are perpendicular to the remaining portions and the main supporting portion.




b

Housing for encasing an object

An apparatus and system for housing a device include a housing that is configured such that a device may be fitted within the housing and thereby be protected, such as from shocks and/or liquid. The housing may include top and bottom members that may be removably coupled together so as to form the housing. Each top and bottom member optionally includes front and back surfaces surrounded by a perimeter. The perimeter is defined by proximal and distal ends as well as opposing sides. The top and bottom members may include respective clasping mechanisms that extend along the perimeter of the top and bottom members. The clasping mechanisms are configured for coupling the top and bottom members with one another thereby sealing the housing, for instance, in a shock-proof and/or water tight seal.




b

Method of producing a booklet, data page produced by this method and booklet produced by the method

The booklet comprises a number of sheets between a cover, and each sheet has a front side and a rear side. At least one data page is provided that is joined to the cover in a fixed manner. The data page comprises a flexible layer and this flexible layer projects with an area out of a data carrier. On this area, the data page is joined to the cover and to the remaining sheets. The flexible layer is flatly joined to at least one other layer, for example, by welding or bonding and is thus inseparably bound without a mechanical joining part.




b

Booklet with ultra removable adhesive label

An ultra removable booklet with label for application to media is described. The booklet with label includes a release liner, an ultra removable adhesive layer, a paper stock layer, a booklet, an adhesive layer, and a clear plastic cover layer. The clear plastic cover layer has the adhesive layer applied to a bottom surface thereof and the bottom surface is positioned over the booklet. The booklet is positioned over the paper stock. The ultra removable adhesive layer is attached to the lower surface of the paper stock. The release liner is applied to the ultra removable adhesive layer. A process for forming an ultra removable booklet with label for application to media is also described.




b

Reusable notecard and methods of use thereof

Embodiments of the invention are directed to reusable notecard. In one embodiment, the reusable notecard is comprised of a trifold panel having a left panel, a center panel and a right panel and a reclosable closing mechanism, connected to the trifold panel, to releasably secure the left panel to the right panel when folded over one another. In one embodiment, the adjustable left panel is comprised of a plurality of left panel fold lines and the right panel is comprised of a plurality of right panel fold lines, the plurality of left panel fold lines and the plurality of right panel fold lines for adapting to dimensions of contents inside the notecard. In one embodiment, the trifold panel is made of a material allowing for non-permanent markings.




b

Convertible transport apparatus

An apparatus (10) for transporting items includes a base (12), a handle element (16) extending from the base (12), a pair of rollers or wheels (20) mounted to the base (12) and a platform (14) mounted to the base (12) and adapted for movement between a stored condition and an operative position. The platform (14) includes first and second leg elements (24) and a platform support (26) connected to the first and second leg elements (24) and extending therebetween. The platform (14) is dimensioned and adapted to carry an object when in the operative position. The platform support (26) may comprise a flexible material such as a fabric material.




b

Binding element and associated method for binding

A binding structure for binding a bundle of sheets and that includes a base and a pair of opposed position legs that are integrally formed with and extend from respective sides of the base. The pair of legs and base together defines a retention area in which the bundle of sheets is held. The pair of legs is constructed and arranged with a resilient bias toward each other, but separable to enable the bundle of sheets to be held therebetween under a biasing force. The legs each have at least one inwardly directed rib arranged for contact with opposed sides of the bundle of sheets, and a thermal adhesive layer is disposed on the base and upon which the bundle of sheets rests, to be later formed in a thermal binding machine.




b

Spine label pocket for a binder cover

A binding cover having a transparent overlay cover disposed over and around the spine of the binding is configured to provide a label pocket on the spine portion of the binding cover wherein a label may be inserted easily without tools or rigid label material. In several embodiments the label pocket provides a fixed label space. In another embodiment the label pocket opens along the spine when the binding cover is opened, and returns to a closed position when closed, thereby retaining a label inserted therein. In another embodiment a method for forming the label pocket is provided.




b

Integrable bookstand

An integrable bookstand adapted to be integrated into a hard back cover of a book is disclosed. The integrable bookstand having a withheld and deployed conformations. In the withheld conformation the bookstand is coplanar with the hard back cover, rendering the latter storable in tandem between other flat articles.




b

Communications device including radio frequency (RF) signal blocking layer for near-field communication (NFC) device and related methods

A communications device may include a near-field communication (NFC) circuit device, and a radio frequency (RF) signal blocking member adhesively coupled with the NFC device. The RF signal blocking member may be configured to block RF signal communication by the NFC device while coupled therewith. The RF signal blocking member may comprise an electrical conductor. In accordance with an example, the RF signal blocking member may comprise a frangible layer. In another example, a pressure sensitive adhesive layer may be included for adhesively securing the RF signal blocking member with the NFC device.




b

Lay flat book sheets

A sheet stock having a flexible hinge area is described. The sheet stock includes a substrate having an opening and gap stiffener, and a flexible film covering the opening and defining a flexible hinge area in the region of the opening and gap stiffener covered by the film. Methods for producing sheet stock having a flexible hinge area are also described. The sheet stock may be used in printing, binding, and in other applications.




b

Making bound document having fastener and spacer

Sheets are bound to form a bound document by fastening together the sheets and a binding strip. A spacer is applied to a back sheet adjacent to the feet of the fasteners. A wraparound portion of the binding strip is folded around the spine edges of the sheets so that adhesive on the strip contacts the spacer or the back sheet farther from the spine than the feet of the fasteners. The adhesive is affixed to the back sheet. The binding strip includes a spacer adjacent to the heads of the fasteners, protruding above the face-attachment portion at least as far as the heads of the fasteners do.




b

Notebook cover with extending hole-punched tabs for facilitating attachment to ringed binder

A bound system including a plurality of pages and a cover and/or divider including a bound outer edge and a plurality of free outer edges. The cover and/or divider may be bound to the plurality of pages along the bound edge. The cover and/or divider may include one or more discreet tabs extending generally outwardly relative to one of the edges. Each tab may be integrally formed from a single piece of material with the rest of the cover and/or divider. Each tab further may have an opening formed therethrough and is configured to receive at least part of a binding device therethrough to thereby couple the cover and/or divider to the binding device.




b

Device for holding sheets in a binder which form a folded stack

The invention relates to a device for holding sheets in a binder which form a folded stack, comprising a holding element (3) connected to the spine (2) of the binder (1). According to the invention, the holding element (3) engages behind the innermost sheet of the stack (4) at its fold (9).




b

Binding element and associated method for binding

A binding structure for binding a bundle of sheets and that includes a base and a pair of opposed position legs that are integrally formed with and extend from respective sides of the base. The pair of legs and base together defines a retention area in which the bundle of sheets is held. The pair of legs is constructed and arranged with a resilient bias toward each other, but separable to enable the bundle of sheets to be held therebetween under a biasing force. The legs each have at least one inwardly directed rib arranged for contact with opposed sides of the bundle of sheets, and a thermal adhesive layer is disposed on the base and upon which the bundle of sheets rests, to be later formed in a thermal binding machine.




b

Searchable binder

A binder management system having a cabinet with shelves for removable storage of searchable binders. Each binder has a body with front and rear covers and a spine. Inside the body is a binder mechanism for removably retaining sheet media. Each binder has externally extending upper and tower ohmic contact members which ohmically engage conductive members mounted on the shelf surfaces near the front. Each binder has a binder identification circuit coupled to an LED mounted on the binder spine in a location visible when the binder rests on a shelf. When a binder identification signal from a host computer is presented to the shelf conductive members it is transferred by the binder contact members to the binder identification circuit. If the signal matches, the LED is activated to aid the user in finding the binder. An LED and an optional audible indicator are mounted on the shelves to further aid the user in finding the sought binder.




b

Attachable dry erase shopping list

A clipboard for keeping lists of items for purchases is described. The clipboard includes a dry-erase board, a paper pad, a holder for a dry-erase marker, a holder for an ink pen, a plurality of magnets for holding the clipboard to a ferro-magnetic surface, and a folding board having a clip for attaching to the clipboard to a shopping cart handled. The clip is configured to enable tilting the clipboard with mounted on a shopping cart handle. The clipboard can be moved from a refrigerator, carried to a store, and then clipped onto a shopping cart.




b

Method and apparatus for superposed application of shipping labels over packing slips

The invention provides a method and apparatus for applying shipping labels over both folded or non-folded packing slips, or the like, at a single print-and-apply station, either through use of a label configured for application to a substrate and also in a superposed registered manner to another label of identical construction previously attached to the substrate, or by using a shipping label having a non-aggressive adhesive applied to a removable center section of the shipping label for attachment of the packing list, or the like, to the shipping label prior to application of the shipping label to the substrate.




b

Plastic film with concealed tearable strip

Disclosed is a plastic film with concealed tearable strip, which includes a film body; at least one first tearable strip having two sides respectively forming first and second joint sections; and at least one second tearable strip having two sides respectively forming a third joint section and an internal tear line. The first and second tearable strips each have one side connected to the film body. The first joint section has two sides each forming a tear line. The third joint section has one side forming at least one tear line. The third joint section and the internal tear line have inside faces respectively coupled to the first and second joint sections, whereby the first and second tearable strips are respectively located at outside and inside of the film body and the second tearable strip is concealed at the inside of the film body.




b

Method for creating a single continuous web from which to fabricate mailpieces

A method for producing a continuous web of printed material for use in creating mailpieces. The continuous web has a width and a length, the length comprised of a series of attached sheets. The series of attached sheets are comprising envelope sheets and rectangular content pages. The content pages are rectangular in shape and may be oriented relative to the envelope sheets in a number of different configurations. In some configurations, two sets of content pages and/or envelope sheets can be printed across the width of the web. Sheets for forming business return envelopes may be printed in series with the content pages and envelope sheets. BREs may include individualized return addresses. A control code may be printed on one or more of the sheets for a given mailpiece, providing information for controlling assembly of the mailpiece. Two sets of sheets may be printed across the width of the web by printing content pages onto the continuous web such that two end-to-end content pages are printed across the width of the web. Positioning of mail content pages and envelope sheets for a given mailpiece may be optimized based on respective processing times determined for the system.




b

Method for binding a bundle of loose leaves or the like and end leaf applied thereby

Method for binding a bundle of loose leaves or the like in a cover. The method includes the step of providing an end leaf that includes a fixing strip on a side edge, with the fixing strip partly fixed to the end leaf and provided with a strip of glue on a part of the fixing strip which is not fixed to the end leaf. On the side of the fixing strip turned away from the end leaf, said strip of glue being provided with a removable foil. Another step is binding a free edge of the bundle of loose leaves together with the end leaf. Further steps include removing the foil, and providing the bound edge of the bundle of leaves and the end leaf in the back of the cover and fixing thereof in the cover only by the strip of glue.




b

Apparatus and device for providing book protection

A book protection apparatus and method are provided, that include a pair of substantially right angled sheets configured in a parallel fashion, the sheets being joined by a joining mechanism having a tension setting mechanism configured between the pair of sheets, to enable forcibly coupling the binding device to a coupled corner of a book.




b

Inside leaflet of book

An inside leaflet of a book is provided which is bond-bound with pages of the book to provide an advertisement. The inside leaflet includes an advertisement printed part and a binding part. Catchphrases or illustrations for advertisement are printed on at least one side of the advertisement printed part. The binding part is configured to be bound with the pages along an edge of the inside leaflet such that the binding part has less binding portions than those of the pages in order to leave no traces or marks when the inside leaflet is detached from the book. Accordingly, since the inside leaflet is able to be bound to pages of various kinds of books and easily removed from the books without leaving any traces or marks in the books, the inside leaflet contributes to extension of the application range of advertisements and improvement of advertisement efficiency.




b

Binding system using binder pieces with concentric cylinders

A binding system for binding a set of media sheets, including first and second binder pieces, each including an end cap, a retainer, a cylinder and a connection mechanism. The retainer has an arc-shaped cross-section having an associated arc angle thereby providing an opening slot that extends along a length of the retainer. The retainer and the cylinder are connected to the end cap such that the cylinder is positioned within the retainer. The binder pieces are adapted to bind the set of sheets of media by inserting the set of media sheets into the first and second binder pieces such that the media sheets are wrapped around the cylinders and extend out of the opening slots in the retainers, and engaging the connection mechanisms to connect the first and second binder pieces together.




b

Binding plant for hardcover books and a method of binding for these books

Binding equipment and false cover forming equipment for hardcover books are disclosed. The false cover forming equipment carries out false covers, by positioning a pair of endpapers in correspondence of lateral binding flaps of a respective backstrip, arranging folds of the endpapers at a pre-assembling distance associated with the thickness of the text block and gluing margins of past-down sheets of the endpapers with binding edges of the backstrip. The binding equipment is feedable, at a cover input “IC”, with the false covers for carrying out book blocks by gluing the backstrips of the false covers with the binding edges of corresponding text blocks and refolding the pairs of endpapers on the respective text blocks. An electronic processing unit is settable for the control of the false cover forming equipment and the binding equipment as a function of the dimensions of the hardcover book to be bound.




b

Movable highlight strip

A highlighter strip including adhesive to form a removable bond with a substrate, constructed from a translucent and colored material. The highlighter strip can be affixed over writing or other markings, which highlights the indicia that remains legible. One or both ends of the strip can omit the adhesive, thereby providing a grabbing portion to facilitate removal from an initial position and optionally subsequent positions. The strip can be included in a set of strips affixed to each other and optionally affixed to another base; such as a notebook, binder, or other entity where one would expect writing, text, or other indicia requiring highlighting.




b

Binding strip including spacer

A binding strip includes a substrate having an interior surface and an exterior surface, a spine-alignment edge, a free edge opposite the spine-alignment edge and substantially non-perpendicular thereto, a face-attachment portion of the exterior surface adjacent to the spine-alignment edge, and a wraparound portion of the interior surface adjacent to the free edge. A border is defined laterally between the face-attachment portion and the wraparound portion and substantially parallel to the spine-alignment edge. An adhesive layer is arranged over the wraparound portion. A first spacer is affixed to the interior surface opposite the face-attachment portion so that a fastener area is defined. The spacer has a selected thickness.




b

Bound document having binding strip with spacer

A bound document has front, back, and interior sheets with spine edges. The document has a binding strip and fasteners binding the sheets and the binding strip together. The strip has a flexible substrate with a face-attachment portion through which the fasteners are driven, and a wraparound portion that is bent so adhesive on the wraparound portion contacts the back sheet farther from the spine edge of the book than the feet of the fasteners. The strip also has a first spacer affixed to the interior surface opposite the face-attachment portion so that a fastener area is defined, the spacer at least as thick as the protrusion of the heads of the fasteners above the face-attachment portion.




b

Clipboard with mounting accessories

A clipboard having a board assembly with a front face and a rear face. A clip assembly is mounted onto the board assembly. The board assembly docks onto a docking assembly. The front face is defined by a top edge, a bottom edge, and first and second lateral edges. The rear face has first and second lower interior channel guide edges and first and second higher interior channel guide edges. The board assembly tapers from the top edge towards the bottom edge. The first and second higher interior channel guide edges terminate forming a channel neck. The channel neck is a channel to receive the docking assembly. The rear face further has at least one grip section that extends from the first or second lateral edge. The front face has a recessed face, and the clip assembly has a docking station, a spring assembly, and a writing instrument holder.




b

Recessed adhesive binding systems

Recessed adhesive binding systems. One system can include a plurality of sheets arranged in a stack, each of the plurality of sheets having a front surface, a rear surface, and an exposed edge. At least one of the front surface and the rear surface of each of the plurality sheets can include at least one recessed adhesive positioned adjacent the exposed edge to form an at least partially exposed recessed adhesive, which can be selectively activated. The rear surface of a first sheet in the plurality of sheets can be positioned adjacent the front surface of a second sheet in the plurality of sheets, or vice versa, and the exposed edges of the plurality of sheets can be staggered, such that the exposed edge of the second sheet extends further outwardly from the stack than the exposed edge of the first sheet in the stack.




b

Book with padded covers and pages

An interchangeable story pillow book system having audio content playback has a book core structure having a spine member, a front cover member, a back cover member, a first page member, and a second page member. The book core structure resembles a book having pages. The system has an audio recording and output system having a microprocessor, a speaker, a microphone, a data storage component, a plurality of activation switches, a power source, and a data interface component. The system has a padded multi-page book sheath having a front cover sheath, a back cover sheath, a first page sheath, and a second page sheath. The book sheath is located over and onto the book core structure.




b

Producing bound document having inner cover sheet

A bound document having a plurality of sheets is produced. Image data for a cover image is received and dividing along a sheet-edge curve into first and second image portions. The first image portion is printed on an inner cover sheet so that an alignment location is defined on the inner cover sheet corresponding to the sheet-edge curve. The inner cover sheet and the plurality of sheets are bound together. The second image portion is printed on an outer cover sheet, and is printed borderlessly with respect to a selected edge of the outer cover sheet. After the binding step, the outer cover sheet is affixed to the inner cover sheet so that the selected edge aligns with the alignment location to form the bound document.




b

Binding system using concentric cylinders

A binding system for binding a set of media sheets, including a cylinder having an outer diameter and a length, and a retainer fabricated from a flexible material. The retainer has an arc-shaped cross-section having an inner diameter and an associated arc angle thereby providing an opening slot that extends along a length of the retainer. The binding system is adapted to bind the set of media sheets by wrapping the media sheets around the cylinder and inserting the wrapped cylinder into the retainer with the wrapped media sheets extending out of the opening slot in the retainer. The inner diameter of the retainer is less than the sum of the outer diameter of the cylinder and a total thickness of the wrapped media sheets so that the retainer flexes to provide a clamping force to bind the media sheets.




b

Composition book

A composition book having a front and back cover and a plurality of pages stitched together wherein the plurality of pages may have hole punches and the front and back cover may have hole punches such as to allow the composition book to fit within a binder and wherein the plurality of pages are perforated such that they may be removed from the composition book.




b

Book cover with printed image

A system for affixing a printed image onto a book cover, comprising a sleeve having a front surface, a back surface and four edges. The sleeve includes a front layer having a transparent window region surrounded by an opaque mask region and a back layer joined to the front layer along at least two of the edges, wherein the back layer is not joined to the front layer along at least one of the edges thereby providing at least one open edge adapted to receive the printed image. Adhesive strips having peelable coverings are affixed onto the back surface of the sleeve along at least two of the edges. The opaque mask region is adapted to cover the edges of the printed image, and the adhesive strips are adapted to affix the sleeve onto the book cover.




b

Page construction for improved manipulation and book incorporating the same

A book having a page construction for improved page manipulation. The book includes a plurality of pages bound together at an edge margin, wherein each page includes a bound edge and a plurality of free edges. At least one of the free edges of at least one of the pages includes an edge relief. The pages may comprise cardboard or other stiff material having a thickness. The free edges include opposed top and bottom edges and a side edge. The edge relief may extend along the entire side edge or only a portion thereof. The edge relief may be in the form of, for example, a chamfer, a bevel, a radius, a notch, a step, or the like.




b

Printable book binding structure

A book binding structure which includes at least one adhesive binder strip and a pair of supporting sheets for supporting the binder strip during a binder strip printing process. Opposite ends of the binder strip are supported on separate support sheets, which are coupled together only by way of the binder strip to allow independent movement of the ends of the binder strip. The sheets are arranged to support the binder strip as is passes along the paper path of a conventional printer.




b

Foldable pop-up article

A foldable and unfoldable pop-up article with a tensioning member.




b

Publication and method of making a publication

A publication including a plurality of pairs of pages, with the pair of pages comprised of a removable page and non-removable page. The removable page has a perforated edge, an adhesive edge opposite the perforated edge and a printable surface. The non-removable page has a printable surface. The pairs of pages are arranged such that alternate pages are removable and can be removed without harming the publication or the non-removable pages. The removable pages can be arranged to form an image larger than the publication itself and removable attached to a surface through the adhesive edge.




b

Booklet stacker, ring-binding device, ring-binding system, and booklet stacking method

A booklet stacker to stack multiple booklets each bound with a ring member includes a stack tray on which multiple booklets are stacked, a shifter disposed upstream from the stack tray in a booklet conveyance direction in which a booklet is conveyed, the shifter to adjust a position of the booklet in a width direction perpendicular to the booklet conveyance direction by shifting the booklet a distance shorter than a ring pitch of the ring member in the width direction, and a booklet conveyer disposed upstream from the stack tray in the booklet conveyance direction, to convey the booklet positioned by the shifter to the stack tray.




b

Operational transconductance amplifier with increased current sinking capability

An amplifier circuit includes an input terminal and an output terminal. A current sinking transistor includes a first conduction terminal coupled to the output terminal and a second conduction terminal coupled to a reference supply node. A voltage sensing circuit has a first input coupled to the input terminal and a second input coupled to the output terminal. An output of the voltage sensing circuit is coupled to the control terminal of the current sinking transistor. The voltage sensing circuit functions to sense a rise in the voltage at the output terminal which exceeds the voltage at the input terminal, and respond thereto by activating the current sinking transistor.




b

Dual-band high efficiency Doherty amplifiers with hybrid packaged power devices

An amplifying structure includes a main amplifier configured to amplify a first signal; and a peak amplifier configured to amplify a second signal, each of the main amplifier and the peak amplifier including, respectively, a hybrid power device, the hybrid power device including, a first power transistor die configured to amplify signals of a first frequency, and a second power transistor die configured to amplify signals of a second frequency different than the first frequency.




b

Multiple E-probe waveguide power combiner/divider

A power combiner/divider having a waveguide, a plurality of amplifiers disposed on a supporting structure, a plurality of probes, each one having a first end electrically coupled to an output of a corresponding one of the plurality of amplifiers and a second end projecting outwardly from the supporting structure and into the waveguide. The probes are disposed in a common region of the waveguide. The region has a common electric field maximum within the waveguide. A first portion of the probes proximate the sidewalls have lengths different from a second portion of the probes disposed in a region distal from the sidewalls of the waveguide. The waveguide is supported by the support structure. The power combiner is a monolithic microwave integrated circuit structure.




b

Gain calibration of a high speed amplifier

Embodiments include systems and methods for accurately controlling gain of a high-speed variable-gain amplifier (VGA) without adversely impacting bandwidth performance. Embodiments include a VGA with a variable resistor, for which resistance is a function of a control level. A gain calibration system controls the control level by using a gain control feedback subsystem to sample outputs of a duplicate VGA, which includes a duplicate variable resistor. The sampled duplicate outputs are compared to a target gain generated by a reference generator. The control level can be fed back to control the gain of the duplicate VGA until the target gain is reached. The control level can also be fed to the actual VGA to control its gain. By performing gain control on the duplicate VGA without interfering with the output signal path of the actual VGA, the actual VGA's gain can be accurately controlled without impacting its bandwidth.




b

Variable gain amplifier

A variable gain amplifier (100) includes a transistor (110), an FB impedance section (120), a source impedance section (130), a drain impedance section (140), a gain controller (150), and a frequency characteristic controller (160). The gain controller (150) varies impedance of one of the FB impedance section (140), the source impedance section (130), and the drain impedance section (140), and outputs a gain control signal. The frequency characteristic controller (160) varies the impedance of different impedance section, based on the gain control signal.




b

Tunable wide band driver amplifier

A tunable wide band driver amplifier is disclosed. In an exemplary embodiment, an apparatus includes a first band selection circuit selectively connected between an output terminal of an amplifier and a circuit ground. The first band selection circuit configured to adjust an amplification band from a first frequency band to a second frequency band. The apparatus also includes a first harmonic reduction circuit selectively connected between the first band selection circuit and the circuit ground and configured to reduce 2nd harmonic frequencies associated with the first frequency band when the amplification band is set to the first frequency band.




b

Combining an audio power amplifier and a power converter in a single device

An apparatus is described that includes an audio power amplifier having an input and an output. An alternating-current to direct-current power converter is coupled to the audio power amplifier in a single package to supply power to the audio power amplifier.




b

Power amplifier with an adaptive bias

An electronic circuit, including, a power amplifier adapted to amplify an RF signal and provide it as output from the integrated circuit; a power source that is adapted to provide an unregulated voltage to the power amplifier; a regulator adapted to provide a regulated bias voltage; a subtracter that is adapted to accept a voltage proportional to the unregulated voltage and subtract it from the bias voltage to provide a reference voltage to the power amplifier; wherein the power amplifier is adapted to use the reference voltage to adjust the output from the power amplifier so that it will provide a stable power output.




b

Multimode differential amplifier biasing system

Differential power amplifier circuitry includes a differential transistor pair, an input transformer, and biasing circuitry. The base contact of each transistor in the differential transistor pair may be coupled to the input transformer through a coupling capacitor. The coupling capacitors may be designed to resonate with the input transformer about a desired frequency range, thereby passing desirable signals to the differential transistor pair while blocking undesirable signals. The biasing circuitry may include a pair of emitter follower transistors, each coupled at the emitter to the base contact of each one of the transistors in the differential transistor pair and adapted to bias the differential transistor pair to maximize efficiency and stability.