Tunable N-Path Notch Filters for Blocker Suppression Modeling and V erification

Abstract

N-path switched- RC circuits can realize filters with very high linearity and compression point while they are tunable by a clock frequency. In this paper, both differential and single-ended N-path notch filters are modeled and analyzed. Closed-form equa- tions provide design equations for the main filtering characteris- tics and nonidealities such as: harmonic mixing, switch resistance, mismatch and phase imbalance, clock rise and fall times, noise, and insertion loss. Both an eigh t-path single-e