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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.