Self-Tuning N-Path Filter

This paper takes a novel approach to N-Path filtering by adding self-tuning capabilities to filter out unwanted blockers based off their power. The PCB prototype uses a 4 phase design that provides up to 14dB of rejection from 1MHz to 50MHz. Additional circuitry turns off the filter when no blocker is present. This is the only self-tuning N-Path filter to the knowledge of the authors.