2019/10/30 by Rayudu, Venkata S., Kang, Heechai, Gharpurey, R.
#FOS: Electrical engineering #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · doi:10.48550/arxiv.1910.14019
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.