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Library Characterization Tidbits: Recharacterize What Matters - Save Time!

Recently, I read an article about how failure is the stepping stone to success in life. It instantly struck a chord and a thought came zinging from nowhere about what happens to the failed arcs of a...

[[ Click on the title to access the full blog on the Cadence Community site. ]]




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QPSS with non-50% dutycycle square wave clocks (For sample and hold)

Hello,

Would anyone know how to setup a PSS or QPSS simulation with 25% dutycycle clock sources or if such a thing is possible with QPSS.

Fig1 (below) is a snapshot of the circuit I am trying to characterize. This has 4 clock ports each with 25%duty cycle in the ON state. Fig2 below shows two of these clocks.

Each path in the circuit consists of two switches with a low pass RC sandwiched in between. The Input is a 50Ohm port sine wave and the output is a 1K resistor. The output nets of all paths are connected together.

I am trying to determine the swept frequency response from input to output (voltage) when the input is from 500Mhz to  510MHz. The Period (T=1/Fp) of each of the pulses is such that Fp=500MHz. The first pulse source has a delay=0, second has delay=T/4, third delay=2T/4, etc...

I am currently getting it working and seeing the correct result (bandpass response) with Transient but the problem is doing a dft at 500MHz with 10KHz spacings needs at least 100us and takes up a lot of time and disk space.

Many Thanks,
Chris.



Fig1


Fig2




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Skill code to Calculating PCB Real-estate usage using placement boundaries and package keep ins

Other tools allow a sanity check of placement density vs available board space.  There is an older post "Skill code to evaluate all components area (Accumulative Place bound area)"  (9 years ago) that has a couple of examples that no longer work or expired.

This would be useful to provide feedback to schismatic and project managers regarding the component density on the PCB and how it will affect the routing abilities.  Thermal considerations can be evaluated as well 

Has anyone attempted this or still being done externally in spread sheets?




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Here Is Why the Indian Voter Is Saddled With Bad Economics

This is the 15th installment of The Rationalist, my column for the Times of India.

It’s election season, and promises are raining down on voters like rose petals on naïve newlyweds. Earlier this week, the Congress party announced a minimum income guarantee for the poor. This Friday, the Modi government released a budget full of sops. As the days go by, the promises will get bolder, and you might feel important that so much attention is being given to you. Well, the joke is on you.

Every election, HL Mencken once said, is “an advance auction sale of stolen goods.” A bunch of competing mafias fight to rule over you for the next five years. You decide who wins, on the basis of who can bribe you better with your own money. This is an absurd situation, which I tried to express in a limerick I wrote for this page a couple of years ago:

POLITICS: A neta who loves currency notes/ Told me what his line of work denotes./ ‘It is kind of funny./ We steal people’s money/And use some of it to buy their votes.’

We’re the dupes here, and we pay far more to keep this circus going than this circus costs. It would be okay if the parties, once they came to power, provided good governance. But voters have given up on that, and now only want patronage and handouts. That leads to one of the biggest problems in Indian politics: We are stuck in an equilibrium where all good politics is bad economics, and vice versa.

For example, the minimum guarantee for the poor is good politics, because the optics are great. It’s basically Garibi Hatao: that slogan made Indira Gandhi a political juggernaut in the 1970s, at the same time that she unleashed a series of economic policies that kept millions of people in garibi for decades longer than they should have been.

This time, the Congress has released no details, and keeping it vague makes sense because I find it hard to see how it can make economic sense. Depending on how they define ‘poor’, how much income they offer and what the cost is, the plan will either be ineffective or unworkable.

The Modi government’s interim budget announced a handout for poor farmers that seemed rather pointless. Given our agricultural distress, offering a poor farmer 500 bucks a month seems almost like mockery.

Such condescending handouts solve nothing. The poor want jobs and opportunities. Those come with growth, which requires structural reforms. Structural reforms don’t sound sexy as election promises. Handouts do.

A classic example is farm loan waivers. We have reached a stage in our politics where every party has to promise them to assuage farmers, who are a strong vote bank everywhere. You can’t blame farmers for wanting them – they are a necessary anaesthetic. But no government has yet made a serious attempt at tackling the root causes of our agricultural crisis.

Why is it that Good Politics in India is always Bad Economics? Let me put forth some possible reasons. One, voters tend to think in zero-sum ways, as if the pie is fixed, and the only way to bring people out of poverty is to redistribute. The truth is that trade is a positive-sum game, and nations can only be lifted out of poverty when the whole pie grows. But this is unintuitive.

Two, Indian politics revolves around identity and patronage. The spoils of power are limited – that is indeed a zero-sum game – so you’re likely to vote for whoever can look after the interests of your in-group rather than care about the economy as a whole.

Three, voters tend to stay uninformed for good reasons, because of what Public Choice economists call Rational Ignorance. A single vote is unlikely to make a difference in an election, so why put in the effort to understand the nuances of economics and governance? Just ask, what is in it for me, and go with whatever seems to be the best answer.

Four, Politicians have a short-term horizon, geared towards winning the next election. A good policy that may take years to play out is unattractive. A policy that will win them votes in the short term is preferable.

Sadly, no Indian party has shown a willingness to aim for the long term. The Congress has produced new Gandhis, but not new ideas. And while the BJP did make some solid promises in 2014, they did not walk that talk, and have proved to be, as Arun Shourie once called them, UPA + Cow. Even the Congress is adopting the cow, in fact, so maybe the BJP will add Temple to that mix?

Benjamin Franklin once said, “Democracy is two wolves and a lamb voting on what to have for lunch.” This election season, my friends, the people of India are on the menu. You have been deveined and deboned, marinated with rhetoric, seasoned with narrative – now enter the oven and vote.

The India Uncut Blog © 2010 Amit Varma. All rights reserved.
Follow me on Twitter.




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Farmers, Technology and Freedom of Choice: A Tale of Two Satyagrahas

This is the 23rd installment of The Rationalist, my column for the Times of India.

I had a strange dream last night. I dreamt that the government had passed a law that made using laptops illegal. I would have to write this column by hand. I would also have to leave my home in Mumbai to deliver it in person to my editor in Delhi. I woke up trembling and angry – and realised how Indian farmers feel every single day of their lives.

My column today is a tale of two satyagrahas. Both involve farmers, technology and the freedom of choice. One of them began this month – but first, let us go back to the turn of the millennium.

As the 1990s came to an end, cotton farmers across India were in distress. Pests known as bollworms were ravaging crops across the country. Farmers had to use increasing amounts of pesticide to keep them at bay. The costs of the pesticide and the amount of labour involved made it unviable – and often, the crops would fail anyway.

Then, technology came to the rescue. The farmers heard of Bt Cotton, a genetically modified type of cotton that kept these pests away, and was being used around the world. But they were illegal in India, even though no bad effects had ever been recorded. Well, who cares about ‘illegal’ when it is a matter of life and death?

Farmers in Gujarat got hold of Bt Cotton seeds from the black market and planted them. You’ll never guess what happened next. As 2002 began, all cotton crops in Gujarat failed – except the 10,000 hectares that had Bt Cotton. The government did not care about the failed crops. They cared about the ‘illegal’ ones. They ordered all the Bt Cotton crops to be destroyed.

It was time for a satyagraha – and not just in Gujarat. The late Sharad Joshi, leader of the Shetkari Sanghatana in Maharashtra, took around 10,000 farmers to Gujarat to stand with their fellows there. They sat in the fields of Bt Cotton and basically said, ‘Over our dead bodies.’ ¬Joshi’s point was simple: all other citizens of India have access to the latest technology from all over. They are all empowered with choice. Why should farmers be held back?

The satyagraha was successful. The ban on Bt Cotton was lifted.

There are three things I would like to point out here. One, the lifting of the ban transformed cotton farming in India. Over 90% of Indian farmers now use Bt Cotton. India has become the world’s largest producer of cotton, moving ahead of China. According to agriculture expert Ashok Gulati, India has gained US$ 67 billion in the years since from higher exports and import savings because of Bt Cotton. Most importantly, cotton farmers’ incomes have doubled.

Two, GMO crops have become standard across the world. Around 190 million hectares of GMO crops have been planted worldwide, and GMO foods are accepted in 67 countries. The humanitarian benefits have been massive: Golden Rice, a variety of rice packed with minerals and vitamins, has prevented blindness in countless new-born kids since it was introduced in the Philippines.

Three, despite the fear-mongering of some NGOs, whose existence depends on alarmism, the science behind GMO is settled. No harmful side effects have been noted in all these years, and millions of lives impacted positively. A couple of years ago, over 100 Nobel Laureates signed a petition asserting that GMO foods were safe, and blasting anti-science NGOs that stood in the way of progress. There is scientific consensus on this.

The science may be settled, but the politics is not. The government still bans some types of GMO seeds, such as Bt Brinjal, which was developed by an Indian company called Mahyco, and used successfully in Bangladesh. More crucially, a variety called HT Bt Cotton, which fights weeds, is also banned. Weeding takes up to 15% of a farmer’s time, and often makes farming unviable. Farmers across the world use this variant – 60% of global cotton crops are HT Bt. Indian farmers are so desperate for it that they choose to break the law and buy expensive seeds from the black market – but the government is cracking down. A farmer in Haryana had his crop destroyed by the government in May.

On June 10 this year, a farmer named Lalit Bahale in the Akola District of Maharashtra kicked off a satyagraha by planting banned seeds of HT Bt Cotton and Bt Brinjal. He was soon joined by thousands of farmers. Far from our urban eyes, a heroic fight has begun. Our farmers, already victimised and oppressed by a predatory government in countless ways, are fighting for their right to take charge of their lives.

As this brave struggle unfolds, I am left with a troubling question: All those satyagrahas of the past by our great freedom fighters, what were they for, if all they got us was independence and not freedom?

The India Uncut Blog © 2010 Amit Varma. All rights reserved.
Follow me on Twitter.




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How do we use the concept of Save and Restore during real developing(debugging)???/

Hi All,

I'm trying to understand checkpoint concept. When I found save and restart concept in cdnshelp, There is just describing about "$save" and "xrun -r "~~~".

and I found also the below link about save restart and it saves your time.

But I can't find any benefits from my experiment from save&restart article( I fully agree..the article)

Ok, So I'v got some experiment  Here.

1. I declared $save and got the below result as I expected within the simple UVM code.

In UVM code...

$display("TEST1");
$display("TEST2");
$save("SAVE_TEST");
$display("TEST3");
$display("TEST4");

And I restart at "SAVE_TEST" point by xrun -r "SAVE_TEST", I've got the below log

xcelium> run
TEST3
TEST4

Ok, It's Good what I expected.(The concept of Save and Restore is simple: instead of re-initializing your simulation every time you want to run a test, only initialize it once. Then you can save the simulation as a “snapshot” and re-run it from that point to avoid hours of initialization times. It used to be inconvenient. I agree..)

2. But The Problem is that I can't restart with modified code. Let's see the below example.

I just modified TEST5 instead of "TEST3"

$display("TEST1");
$display("TEST2");
$save("SAVE_TEST");
$display("TEST5"); //$display("TEST3");
$display("TEST4");

and I rerun with xrun -r "SAVE_TEST", then I've got the same log

xcelium> run
TEST3
TEST4

There is no "TEST5". Actually I expected "TEST5" in the log.From here We know $save can't support partially modified code after $save. 

Actually, through this, we can approach to our goal about saving developing time. 

So I want to know Is there any possible way that instead of re-initializing our simulation every time we want to run a test, only initialize it once and keep developing(debugging) our code ?

If we do, Could you let me know the simple example?




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IC Packagers: Time-Saving Alternatives to Show Element

In the Allegro back-end layout products like Allegro Package Designer Plus, it would be reasonable to assume that the most often used command is none other than “show element” (shortcut key F4). This command, runnable at nearly any t...(read more)



  • Allegro Package Designer
  • Allegro PCB Editor

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OVM transactions in simvision

 Hi,

I'm using OVM transaction level tracing in SV. I was wondering if I can have simvision render different types of transactions with different colors e.g. based on a transaction attribute. I know how to do it at signal level using mnemonics but I haven't succeeded doing this at transaction level. Anyone?

 -Joep




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Regarding Save/Restore Settings for Transient Simulation

Hello,

I am running a transient simulation on my circuit and usually my simulation time took me more than a day (The circuit is quite big). I am usually saving specific nodes to decrease the simulation time. My problem is, since it usually took me one day to finish I need to save my trans simulation just in case something bad happens. I am aware that the transient simulation have the options for save/restore. But, when I tried to use it I have some problem. Whenever I restore the save file, it starts where it ends before (expected function) but my data is incomplete. It doesn't save the previous data. Its kind of my data is incomplete. What I did is set the saveperiod and savefile. I hope someone can help me. Thank you!


Regards,

Kiel




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Layout can't open with the following warning message in CIW

Hi,

I tried to open my layout by Library Manager, but the Virtuoso CIW window sometimes pops up the follow WARNING messages( as picture depicts). Thus, layout can't open.

Sometimes, I try to reconfigure ICADV12.3 by the iscape and restart my VM and then it incredibly works! But, often not!

So, If anyone knows what it is going on. Please let me know! Thanks!

Appreciated so much   




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Different Extracted Capacitance Values of the Same MOM Cap Structures Obtained from Quantus QRC Filed Solver

Hello,

 

I am using Virtuoso 6.1.7.

 

I am performing the parasitic extraction of a MOM cap array of 32 caps. I use Quantus QRC and I enable field solver. I select “QRCFS” for field solver type and “High” for field solver accuracy. The unit MOM cap is horizontally and vertically symmetric. The array looks like the sketch below and there are no other structures except the unit caps:

Rationally speaking, the capacitance values of the unit caps should be symmetric with respect to a vertical symmetry axis that is between cap16 and cap17 (shown with dashed red line). For example,

the capacitance of cap1 should be equal to the capacitance of cap32

the capacitance of cap2 should be equal to the capacitance of cap31

etc. as there are no other structures around the caps that might create some asymmetry.

Nevertheless, what I observe is the following after the parasitic extraction:

As it can be seen, the result is not symmetric contrary to what is expected. I should also add that I do not observe this when I perform parasitic extraction with no filed solver.

Why do I get this result? Is it an artifact resulting from the field solver tool (my conclusion was yes but still it must be verified)? If not, how can something like this happen?

 

Many thanks in advance.

 

Best regards,

Can




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Library Characterization Tidbits: Recharacterize What Matters - Save Time!

Read how the Cadence Liberate Characterization solution effectively enables you to characterize only the failed or new arcs of a standard cell.(read more)




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Arduino: how to save the dynamic memory?

When the Arduino Mega2560 is added to the first serial port, the dynamic memory is 2000 bytes, and when the second serial serial is added, the dynamic memory is 4000 bytes. Now I need to add the third Serial serial port. The dynamic memory is 6000 bytes. Due to the many variables in the program itself, the dynamic memory is not enough. Please help me how to save the dynamic memory?




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News18 Urdu: Latest News Prakasam

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News18 Urdu: Latest News Mandsaur

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News18 Urdu: Latest News Chaibasa

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News18 Urdu: Latest News Samastipur

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News18 Urdu: Latest News Sawai Madhopur

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News18 Urdu: Latest News Sabarkantha

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News18 Urdu: Latest News Saharanpur

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News18 Urdu: Latest News Saran Chapra

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News18 Urdu: Latest News Sibsagar

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News18 Urdu: Latest News Hissar

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News18 Gujarati: Latest News Borasad

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News18 Urdu: Latest News Sangrur

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News18 Urdu: Latest News Sambalpur

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News18 Urdu: Latest News Valsad

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News18 Urdu: Latest News Saharsa

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News18 Urdu: Latest News Satara

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News18 Urdu: Latest News Sangli

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News18 Urdu: Latest News Sant Kabir Nagar

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News18 Urdu: Latest News Jaisalmer

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USAમાં કોરોના પર સંશોધન, Covid-19ને જડમૂળમાંથી ઉખાડતા 2 વર્ષ નીકળી જશે

અમેરિકાની મેનેસૅટા યૂનિવર્સિટીના ચેપીરોગો વિશેના સંશોધનકારોના નવા અભ્યાસથી ખળભળાટ




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ભોપાલ : લૉકડાઉન 3.0ના પ્રથમ લગ્નમાં Sanitizerથી થયું જાનૈયાનું સ્વાગત

આ પહેલા લગ્ન હતા જેમાં રિવાજો પણ ફોલો કરવામાં આવ્યા અને કોરોના બચાવની મોટા ભાગની ગાઇડલાઇન્સ પણ.




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News18 Gujarati: Latest News Mansa

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News18 Gujarati: Latest News Sarasvati

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News18 Gujarati: Latest News Jambusar

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News18 Gujarati: Latest News Sami

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News18 Gujarati: Latest News Sankheswar

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Video: એકાંતથી કંટાળી Dinosaurનો ડ્રેસ પહેરી રસ્તા પર રખડ્યો શખ્સ, પોલીસ પણ ગભરાઈ!

કોરોનાનો હાહાકાર : સ્પેનમાં લૉકડાઉન બાદ ઘરમાં કેદ એક શખ્સે રસ્તા પર મુક્ત મને ફરવા અપનાવી અનોખી યુક્તિ




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કોરોના વાયરસઃ સાવધાન! NASAના નામે આ Fake Messageને વાયરલ કરાયો

Fake Message: જનતા કર્ફ્યૂ સમયે તાળી અને થાળી વગાડવાના અવાજ બાદ એક સાઉન્ડ વેબ ક્રિએટ થયો અને કોરોના ભારતમાં નબળો પડી ગયો




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NASAએ શોધ્યો પૃથ્વી જોવા ગ્રહ, પાણી માટે જ્યાં છે અનુકૂળ સ્થિતિ

નાસાને આવો ત્રીજો ગ્રહ મળ્યો છે જ્યાં જીવન હોવાની સંભાવના છે.




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News18 Urdu: Latest News Kasaragod

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કોરોના વાયરસના કારણે કપાશે Salary, આવ્યા મોટા સમાચાર

કોરોના વાયરસ માત્ર લોકોનો માત્ર જીવ જ નથીલઈ રહ્યો પરંતુ તેની સાથે-સાથે આ મહામારી આર્થિક મંદીની પણ પરિસ્થિતિ પેદા કરી રહ્યો છે.




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Lockdown : અહીં કામ કરતા કર્મચારીઓને માટે ખુશખબરી, મળશે 3 ગણી Salary

દેશભરમાં તેના 400 કર્મચારી છે, જેમાંથી 300 મુંબઈ મુખ્ય કાર્યાલયમાં કાર્યરત છે.




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2 લાખની વધુ H-1B Visa હોલ્ડરની મુશ્કેલીઓ વધી, જૂનમાં પૂરી થશે માન્યતા

ટ્રંપ પ્રસાશમાં ઇમીગ્રેશન અને ફોરેન વર્કરના નિયમો ખૂબ જ કડક છે.




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TV,ફ્રિઝ, AC ખરીદનારને Samsung આપી રહ્યું છે ભારે કેશબેક, નો કોસ્ટ EMIની સાથે મળશે આ ઓફર્સ

લૉકડાઉન પુરૂં થતાની સાથે જ ટેલિવિઝન અને અન્ય ડિજિટલ એપ્લાયન્સ પર આજે અનેક લોભામણા ઓફરની જાહેરાત કરી છે.




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Saltlake News in Bengali by News18 Bengali




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Happy Birthday Samantha Akkineni: লকডাউনে স্ত্রীয়ের জন্য নিজে হাতে কেক তৈরি করলেন অভিনেতা নাগা চৈতন্য




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News18 Urdu: Latest News Lakhisarai

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