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hande.vinayak Junior Member Offline Posts: 22 BOM	Folded cascode opamp Oct 05^th, 2006, 9:22pm Hi, I wanted to design a opamp with UGB 180Mhz with PM around 50 degrees and open loop gain 65dB.As per this spec. can you help me to decide a proper opamp config.If anybody is having a papera regarding folded cascode,can you like share with me? Thanks.
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bharat Community Member Offline Posts: 57	Re: Folded cascode opamp Reply #1 - Oct 5^th, 2006, 10:30pm Folded cascode is preferred because of head room issue. If you are good in head room there is no need of folded cascode. I believe in KISS (keep it simple and small ) philosophy. Bias generation is little tricky in folded cascode. -Bharat
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hande.vinayak Junior Member Offline Posts: 22 BOM	Re: Folded cascode opamp Reply #2 - Oct 6^th, 2006, 3:27am Thanks Bharat. Can you suggest any paper in the case of Fully Differential FC OTA? Thnx.
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Raul Community Member Offline Posts: 37 San Jose, CA.	Re: Folded cascode opamp Reply #3 - Oct 10^th, 2006, 2:25pm Are you only driving capacitance? If so, a folded-cascode is the best option.
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packiaraj Junior Member Offline Posts: 28 India	Re: Folded cascode opamp Reply #4 - Oct 11^th, 2006, 8:40pm Look for the attached JSSC paper on Fully Differential Folded Cascode OTA Design. Thanks, Packiaraj.V.
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jbdavid

Community Fellow

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Posts: 378
Silicon Valley

Re: Folded cascode opamp
Reply #5 - Oct 11^th, 2006, 11:07pm

Unless that was YOUR paper, its covered by an IEEE copyright..
ok even if it was its covered, but IEEE allows you to distribute a few copies of your own paper..

In either case,
posting it to a website like this is illegal!
It would be better to post a link

http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=1702&arnumber=45013&count=3...

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jbdavid
Mixed Signal Design Verification

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hande.vinayak Junior Member Offline Posts: 22 BOM	Re: Folded cascode opamp Reply #6 - Oct 12^th, 2006, 12:14am Thanks Packiaraj.V.,it really helped me a lot.
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packiaraj Junior Member Offline Posts: 28 India	Re: Folded cascode opamp Reply #7 - Oct 12^th, 2006, 1:56am I thought before posting....but ?... OK David... Taken... Thanks, Packiaraj.V.
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SATurn Community Member Offline Posts: 53	Re: Folded cascode opamp Reply #8 - Oct 12^th, 2006, 9:17am Please remind that if load capacitor is large, then it is very difficult to achieve the desired specs. In this case you must use another class of amplifier (e.g., class-AB) ...
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