urian
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Posts: 30
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Hi,there! I have designed a pre-amp and what to know the ICMR and noise of it.I use spectre to do simulation. But how to find the DC gain with common-mode level Vcm changing? The circuit is a diff. pair with diode corrected transistors as load,and output is also diff. I made dc sweep with variable Vcm,and plot the expression deriv(Vout+) to see the output,is the result is DC gain with Vcm changing?
Furthemore,when I run noise analysis,I find that I can select pos.&neg output as output noise,but the input noise,but the input voltage source can only select one,and my diff.input is fed by two voltage,then what should I do?
Thanks a lot!
urian
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