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how to calibrate gm-c filter and get the measured frequency response curve

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lhlbluesky

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i have designed a gm-C bandpass filter used in ir receiver module. in my design, C is integrated on-chip (f0=gm/C), so C will change with process variation (may be 20% ~ 30% variation). i want to calibrate the variation of C with process through varing gm (bias current of gm), but how to calibrate this in detail?
besides, in simulation, i can get the frequency response(amplitude vs frequency) of my bandpass filter (ac analysis), but for real chip, how to measure the frequency response of bandpass filter? how to add the stimulus and how to get the frequency response curve?
thanks all.
 

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