Reciprocal mixing and inherent nonlinearity in N-path filters

Reciprocal mixing and inherent nonlinearity in N-path filters

van der Kamp, Pieter (TU Delft Electrical Engineering, Mathematics and Computer Science)

de Vreede, L.C.N. (mentor)
Babaie, M. (graduation committee)
Montazerolghaem, M.A. (graduation committee)

Delft University of Technology

Electrical Engineering

2022-07-08

N-path filters promise to miniaturize RF receivers by replacing various fixed off-chip filters with a single programmable on-chip filter. This research investigates some of the issues of receivers with N-path filters under strong blocker conditions: reciprocal mixing and inherent nonlinearity. First, a technique for reciprocal mixing cancellation is explored and shown to be impossible using only mixers and baseband impedances. Second, the inherent nonlinearity of both bandpass and notch N-path filters are simulated and modelled. To validate this approach, a highly linear receiver is proposed and designed in 40nm CMOS. The receiver has a bandpass common gate architecture, with a notch filter in the feedback path, improving linearity. The filter is isolated using buffers, improving LO leakage. The common gate stage is IM3 compensated to obtain good
linearity (OOB IIP3 >20 dBm).

Receiver
N-path filter
Linearity
Reciprocal mixing

http://resolver.tudelft.nl/uuid:16a73357-9c54-44d4-9d63-6e40bf5ae986

Student theses

master thesis

© 2022 Pieter van der Kamp