题目/Title：A BBPLL-Based Demodulator with Multiphase and Feedforward Linearization Methods for Phase-Tracking Receivers

作者/Author：
                        Kunnong Zeng,Woogeun Rhee,Zhihua Wang

会议/Conference：EDSSC 2019

地点/Location：Xi'an, China

年份/Issue Date：2019.12-14 June

页码/pages：pp. 1 - 3

摘要/Abstract：
This paper describes a low-power multiphase bang-bang PLL (BBPLL) that performs oversampled noise-shaping demodulation as a secondary loop for phase-tracking receivers. A 31-phase BBPLL with a 16-stage ring voltage-controlled oscillator (VCO) is designed to achieve an adaptive loop gain control for a frequency-modulated input with a large frequency deviation. To reduce the effect of VCO nonlinearity on demodulation performance, a feedforward linearization method is proposed by scaling a modulation signal with an integral voltage of the loop filter. The proposed 50MHz divider-less BBPLL is designed in 65nm CMOS, consuming 0.7mW from a 1V supply. Simulation results verify that the multiphase and feedforward linearization methods improve demodulation performance for 5Mb/s BFSK signal with 10MHz deviation.