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Design >> Analog Design >> help needed in opamp design
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Message started by rampat on May 13^th, 2010, 8:58pm

Title: help needed in opamp design
Post by rampat on May 13^th, 2010, 8:58pm

Hi All,
I have opamp spec as follows
Adc=100dB,UGB=900MHz,Supply=1.2V ,Tech=0.13u CMOS
I have 1.2V MOS devices with vthn=vthp~0.45V in this process
Could someone help me in deciding the architecture of opamp for above specs ?
thanks

Title: Re: help needed in opamp design
Post by raja.cedt on May 14^th, 2010, 1:45am

hi,
seems tough spec..but try to use two stage with cascode in the first stage and use some feed forward kind of compensation rather than splitting poles.... better you do the open loop and please publish pole zero location, then people may suggest some tech.

Thanks,
Rajasekhar.

Title: Re: help needed in opamp design
Post by Mayank on May 20^th, 2010, 7:07pm

Hi

900MHz is a bit more than usual which means you gotta employ some wideband Amplifier techniques...

Refer Allen Hollberg or some papers.

--
Mayank