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Gm-c bandpass filter transconductance simulation

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lhlbluesky

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in gm-c bandpass filter (such as bpf-gm-c.jpg), how to simulate the transconductance of OTA, just as gm-curve.jpg (output current vs differential input voltage)? i mean that, how to get the output current of OTA in dc analysis (is it the current difference of pmos and nmos of OTA output stage)?
besides, for a vdd=3V bandpass gm-c filter, generally, what is the max differential input voltage, can it be +/-600mV or larger?
thanks.
bpf-gm-c.jpg
gm-curve.jpg
 

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