The MOSFET- <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</tex> version of the Tow-Thomas activeRC biquadratic filter operated at high frequencies is considered. Formulas for the deviation of quality factor and center frequency due to the finite gain-bandwidth product of the op amps and the intrinsic distributed- RC effects of the MOS transistors are presented and verified by computer simulation. Passive compensation methods are considered for eliminating the degradation of filter performance due to the above effects.