80-GHz impulse radio receiver with quadrature PPM demodulation in 55-nm CMOS technology

This paper presents a quadrature pulse-position modulation (Q-PPM) impulse radio (IR) system, and its novel transceiver architecture for E-band wireless communications. In the Q-PPM IR system, the wavelet of the transmitted signal is time-shifted by multiples of 3 ps from the periodic base position. This paper focuses on the receiver architecture for demodulation of the Q-PPM IR signal. The principle and a detailed analysis of the demodulation scheme are described. The integrated receiver chip was developed in 55-nm CMOS technology. It includes all circuit blocks based on the proposed demodulation architecture, which consists of an in-phase/quadrature (IQ) demodulator, a symbol clock recovery circuit, and a local impulse generator. A measured conversion gain of about 4 dB in the 81-86-GHz frequency band is achieved.