题目/Title：A digital-intensive F/PLL-based two-point modulator with a constant-gain DCO for linear FMCW generation

作者/Author：
                        Ni Xu,Sitao Lv,Woogeun Rhee,Zhihua Wang

会议/Conference：RFIT 2015

地点/Location：Sendai, Japan

年份/Issue Date：2015.26-28 Aug.

页码/pages：pp. 193 - 195

摘要/Abstract：
This paper describes a frequency and phase-locked loop (F/PLL) based two-point modulator architecture for FMCW generation. A semi-digital ???? PLL without a linear TDC is designed to form a nested-loop DCO with a constant gain in the F/PLL. A frequency error caused by a time-varying phase offset in the analog control path with a long modulation period can be mitigated by the loop gain of the frequency-locked loop (FLL). A prototype two-point modulator implemented in 0.18??m CMOS achieves frequency accuracy of <100kHzrms for >10ms modulation period, showing that the proposed F/PLL can be a useful module for accurate detection and high velocity resolution FMCW radar systems.