A Centimeter Resolution, 10 m Range CMOS Impulse Radio Radar for Human

Abstract

A single-chip impulse radio radar transceiver that enables high-resolution reception with enhanced signal to noise ratio (SNR) is proposed. The radar transceiver, consisting of a spectrum adjustable transmitter and a 100-ps resolution 4-channel sampling receiver, successfully demonstrates in/outdoor human walk tracing, stride-rate, and r espiration measurements. The 4-channel sampling receiver, wh ich is robust against pulse dis- tortion, utilizes track and hold samplers and integrators while sharing a single low noise ampli fier. By adopting embedded control logic, the sampling receiver achieves control flexibility as well as improved performance. A repetitive reception mode can proportionally increase the SNR of the receive pulse at the cost of a longer pulse acquisition time. DC offset and low-f requency coherent noise problems caused by on-board control clock signals are resolved with the radar architecture. The single chip radar transceiver is fabricated in a 130-nm CMOS technolo gy occupying ac h i pa r e ao f3 . 2 7m m . The measured results show that echo pulses are recovered with a centimeter range resolution while consuming 80 mA from a supply voltage of 1.2 V.