Good afternoon.  :)I am now working on a gm-c filter, whose cutoff frequency is 3.75MHz and the attenuation at 4.25MHz is about -40dB. When designing the automatic tuning circuit, I met a problem. A friend tells me that for the variations caused by process, voltage and temperature, capacitors in the circuit vary greatly while gm varies little, but he is not too sure about it. So my question is, is it necessary to consider the variations of gm when designing the automatic tuning? can I just tune the variations of capacitors while ignoring the variations of gm?

Thanks!

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