ACWWong
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I agree, so long as you can meet the system requirements (ie inband ripple & gain, groupdelay, signal handling, noise, out-of-band rejection, power, area etc.) then it'll be fine.
I have designed a few gmC filters for wireless transceivers in the past, and have always envitably had to tweak gm values and C values to "optimise" (mostly to correctly centre the response and "square up" the shoulders) when using real kit devices to get nearer the ideal mathematical response.
as you are using gmC, I guess you have some tuning mechanism to overcome PVT spread.
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