Finite gain compensation techniques for high-Q bandpass SC filters

A technique for the compensation of the finite gain in a switched-capacitor (SC) integrator is presented. The technique is effective in a narrow frequency range centered around a specific frequency. The finite-gain compensation technique is derived from the basic idea of memorizing the values of the output signal of SC integrator and using them to predict the operation of the stage in the successive time slots. The operation is based on the memorization of the effects caused by the finite gain at that frequency, and on the use of this information for compensating purposes. The circuits are particularly suited for high-Q high-frequency bandpass filters. An example of a biquad is reported