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can't get 2 precission multiply MDAC for pipeline ADC.

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kazu_kazu

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Dear all member,

I design 1.5 bit MDAC,:
using gain boosting folded cascode opamp
DC gain : 80 dB
UGB : 100MHz

but after I set it up with sc circuit, (2 precission multiply )
I can't get the rsult, sometimes output is bigger 1. ... Vin

but sometimes output even smaller than input.

do anybody knows what is the problem?
thank you very much


kazu



)
 

BackerShu

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Some specific descriptions about your schematic or netlists may help to do locate your problem.
 

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