A Third-Order Quasi-Elliptic N-Path Filter With Enhanced Linearity Through Clock

Abstract

N-path filters show promise to realize tunable, high- quality on-chip filters. However, N-path filters remain restricted to sub-2 GHz operation, low frequency selectivity, and ≈0 dBm power handling. We circumvent these issues through: 1) the concept of frequency-translational higher order N-path filters that uses baseband/intermediary-frequency nodes/resonators to break the trade-off between operating frequency and loss/power consumption; 2) a new complementary Nakagome-charge-pump- based clock