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help needed in opamp design (Read 2074 times)
rampat
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help needed in opamp design
May 13th, 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
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raja.cedt
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Re: help needed in opamp design
Reply #1 - May 14th, 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.                              
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Mayank
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Re: help needed in opamp design
Reply #2 - May 20th, 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.

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Mayank
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