Design Of Analog Correlator For 22-29ghz UWB Vehicular Radar Systems In IBM 90nm CMOS Process

Abstract

In this thesis analog correlator is designed for UWB vehicular radar system. Operating frequency of the correlator is 22-29GHz. IBM 90nm CMOS process is used for the design, Simulation are done in CADENCE Spectre and SpectreRF. UWB signal of 22-29GHz is generated in ADS. Gaussian mono-pulse is shaped with band-pass filter to meet FCC mask. Simulations are done by using this signal. Typical receiver of UWB system consists of LNA, analog correlator and ADC. Analog correlator is the matched filter which is a part of receiver. It is used to detect the incoming RF signal by maximizing signal to noise ratio at its output. Correlator is composed of two blocks namely multiplier and integrator. Multiplication of input RF signal with locally generated template signal is integrated by the capacitor. This correlated signal which is a low frequency signal then converted into digital domain by ADC for further processing. Proposed architecture gives more gain compared to conventional architecture. Gain is improved from -13.97dB to -2.49dB. New method of improving isolation ratio is suggested and results show the improvement of isolation ratio by 2dB. Inductive peaking technique is used to enhance the bandwidth of the circuit. Bandwidth improves by 50% by using inductors at series with the load resistance and also in series with source node of current source transistors. Simulation results shows that signal can be detected in the presence of noise.