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A class AB polyphase Gm-C filter made in standard CMOS processing and dissipating only 1 mW has been presented. It uses a fully differential transconductor with novel feedthrough equalisation to make a balanced filter with near ideal response. It operates from a supply voltage regulator which automatically tunes the filter and provides effective rejection of both supply and substrate noise. The transconductors operate in class AB and this produces excellent efficiency and good linearity, making this filter technique a strong candidate for future wireless transceivers.
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