The effects of mismatch in Gm-C polyphase filters

Based upon state-space representation, the effects of component mismatch in a complex (or polyphase) Gm-C filter are examined. It was found that the effects of component mismatch in this kind of filter are twofold. The first is that it will distort the filter's frequency response. The second and probably more severe consequence is the crosstalk in which the unwanted image signal is leaked into the passband frequencies, interfering with the wanted signal of the selected channel. A simulation method of a polyphase filter is also presented, and simulation results based on Monte Carlo analysis are given.