题目/Title：A 10 Mb/s Hybrid Two-Point Modulator with Front-End Phase Selection and Dual-Path DCO Modulation

作者/Author：李小勇,吕斯陶,刘晓峰,徐妮,李宇根,贾雯,王志华
                        Xiaoyong Li,Sitao Lv,Xiaofeng Liu,Ni Xu,Woogeun Rhee,Wen Jia,Zhihua Wang

会议/Conference：IWS 2015

地点/Location：Shenzhen, China

年份/Issue Date：2015.30 Mar.-1 Apr.

页码/pages：pp. 1 - 4

摘要/Abstract：
This paper presents a hybrid two-point modulator for high data rate modulation. The two-point modulator utilizes a phase selection circuit with a high-frequency DS modulator (DSM) in low-pass modulation to achieve fine resolution for delay mismatch calibration. For high-pass modulation, a separate multi-bit path is designed for a digitally-controlled oscillator (DCO) in addition to the loop control path. A finite impulse response (FIR) filter is introduced in the high-pass modulation path to suppress quantization noise, while offering time-interleaving operation to mitigate the DCO sensitivity for each switching time. The proposed modulator is implemented in 65nm CMOS. Experimental results show that the modulator can achieve 10Mb/s GFSK modulation with the fine time resolution of 138ps.