A 10 to 40 GHz Reflection-Mode <i>N</i>-Path Filter

A bandpass reflection-mode N-path filter (RMNF) with 2 GHz bandwidth and 10 to 40 GHz center-frequency tuning is presented. The design includes a broadband hybrid coupler, Npath reflectors, comprising four-phase passive mixers terminated with third-order in-phase and quadrature-phase active baseband loads, and a broadband clock-generation network. The reflectors realize an in-band open circuit and an out-of-band matched termination, providing a bandpass response in reflection mode. The filter is fabricated in the GlobalFoundries 45 nm RFSOI process. Across the 10 to 40 GHz tuning range, the bandpass filter has 18 dB/octave roll-off, 3.6 to 6.3 dB insertion loss, 40 to 20 dB out-of-band rejection, 6 to 12 dB noise figure, +22 to +12 dBm out-of-band input-referred third-order intercept point, and 130 to 332 mW of power consumption.