Making Digital N-Path Mixers

This paper focuses on a Digital N-Path Mixer for radiofrequency systems, which is synthesized from a VHDL RTL model in a 65 nm CMOS technology. The proposed architecture targets a 4-path mixer including a Finite Impulse Response filter of order 3, and is driven by a Self-Timed Ring Oscillator used as a multiphase generator. This digital system exhibits a power consumption of 0.73 mW, occupies an active area of 0.004 mm(2), and can operate in a frequency range of up to 1 GHz. These performances are compared to their analog counterpart.