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A switched-capacitor N-path circuit can be employed for filtering an RFsignal, as well as a passive downconverter. A known limitation of an N-pathfilter is that in addition to downconverting signals around the desired centerfrequency, the circuit also downconverts signals located around harmonics ofthe center frequency. An N-path filter that uses a PWM representation of asinusoidal LO to mitigate harmonic downconversion is proposed in this work.Single-edge natural sampling pulse-width modulated (PWM) clocks are used todrive the switches in the N-path filter. The potential for employing PWM forproviding gain control is also described.

An N-Path Filter with Multiphase PWM Clocks for Harmonic Response Suppression