An N-Path Filter with Multiphase PWM Clocks for Harmonic Response Suppression
Signal Processing
2019-10-31 v1
Abstract
A switched-capacitor N-path circuit can be employed for filtering an RF signal, as well as a passive downconverter. A known limitation of an N-path filter is that in addition to downconverting signals around the desired center frequency, the circuit also downconverts signals located around harmonics of the center frequency. An N-path filter that uses a PWM representation of a sinusoidal LO to mitigate harmonic downconversion is proposed in this work. Single-edge natural sampling pulse-width modulated (PWM) clocks are used to drive the switches in the N-path filter. The potential for employing PWM for providing gain control is also described.
Keywords
Cite
@article{arxiv.1910.14019,
title = {An N-Path Filter with Multiphase PWM Clocks for Harmonic Response Suppression},
author = {Venkata S. Rayudu and Heechai Kang and R. Gharpurey},
journal= {arXiv preprint arXiv:1910.14019},
year = {2019}
}