A 320 μW Multi-Band Receiver with N-Path Switched-Capacitor Networks

This paper presents a multi-band ultra-low power (ULP) receiver with N-Path Switched-Capacitor (NPSC) networks in 90 nm CMOS process. The NPSC is integrated into the feedback loop of the low noise amplifier (LNA) to flexibly provide narrowband input matching at multiple sub-GHz Industrial, Scientific, and Medical (ISM) bands by adjusting the switching frequency. Moreover, the LNA with an NPSC network is utilized to suppress the out-of-band signal at the input and output of the LNA, simultaneously. In order to achieve an ultra-low power consumption, a sub-threshold LNA and four passive NPSC mixers are implemented in this receiver. The ULP receiver achieves a measured gain of 40±2 dB in ISM bands (430/860/915/960 MHz). The measured noise figure and out-of-band IIP3 are 10±0.5 dB and −0.3±2 dBm, respectively. The ULP receiver chip consumes 320 μW at 0.4 V power supply and occupies a chip area of 0.31 mm2.