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DC offset

Hello all,

I am doing a simulation to determine the DC offset of a two-stage PMOS-based differential opamp. Say, for instance I am using some technique to calibrate the DC offset of the opamp or even assume that I simply observe the DC transfer characteristics curve & determine the DC offset by keeping the reference voltage to VDD/2. I want to know the contribution of that DC offset in terms of % of every MOSFET. DC offset voltage mainly arises due to the device mismatch, differential or current mirror pair's un-matching & other factors. Say, the DC offset of the opamp is 50 mV & I want to determine each MOSFET's contribution or at least a MOSFET-pair's contribution to it. Is it possible in Viruoso Visualization & Analysis tool of CADENCE ?

Thanks in advance :)

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Frank Wiedmann over 7 years ago

I suggest that you take a look at https://community.cadence.com/cadence_blogs_8/b/cic/posts/the-art-of-analog-design-part-4-mismatch-analysis and https://community.cadence.com/cadence_blogs_8/b/cic/posts/the-art-of-analog-design-part-5-response-to-frank-s-question for a start.
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Frank Wiedmann over 7 years ago

I suggest that you take a look at https://community.cadence.com/cadence_blogs_8/b/cic/posts/the-art-of-analog-design-part-4-mismatch-analysis and https://community.cadence.com/cadence_blogs_8/b/cic/posts/the-art-of-analog-design-part-5-response-to-frank-s-question for a start.
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