has all disadvantages but the only one; continious tuning.
Noise/DynamicRange is defined by cap size !
1. GM-C does not use full supply as swing
2. Is inherent nonlinear, best try is NMOS in linear with NPN cascode
3. Uses class A mode. Dc Power equal to maximum power
Alternative is RC with class AB Opamp and switched cap tuning
for capacitors today MIM cap with vertical parallel plates can achieve both good capacity/um^2 (nearly 1 to 1.5 fF/um^2) and substrate decoupling useful for high frequency applications. **broken link removed**
Can anybogy tell how to find cutoff frequency of gm_c filter. Do we have to consider internal parasitic capacitances to find cutoff frequency(I mean cutoff frequency in frequency response of filter)?