CMOS correlation receiver for UWB pulse radar

Abstract

A correlator-based receiver of an UWB radar for cardio-pulmonary monitoring is presented. It consists of Low Noise Amplifier, analog Multiplier and Integrator. The UWB LNA shows a measured −3 dB band close to 5 GHz, from 3.56 and 8.46 GHz, a transducer gain of 22.7 dB at 5.2 GHz, an input reflection coefficient lower than −10.5 dB in −3 dB band, and a input-referred 1-dB compression point of −19.7 dBm, in excellent agreement with the post-layout simulation results. The Multiplier shows a direct conversion gain (GC) equal to 4.3 at 5 GHz, and implements the analog multiplication with a good linearity. The Integrator (i.e. OTA) shows a −3 dB band of 40 Hz, a voltage gain of 32 dB and a phase margin of 90 degree with an input linear range of 100 mV. In the linear range the OTA is characterized by a THD of about −38 dB.