题目/Title：A Low Data Rate FM-UWB Transmitter with Δ−Σ Based Sub-Carrier Modulation and Quasi-Continuous Frequency-Locked Loop

作者/Author：
                        Bo Zhou,Rui He,Jian Qiao,Jinghui Liu,Woogeun Rhee,Zhihua Wang

会议/Conference：A-SSCC 2010

地点/Location：Beijing

年份/Issue Date：2010.8-10 Nov.

页码/pages：pp. 1 - 4

摘要/Abstract：
This paper describes the architecture and circuit design of a low data rate FM-UWB transmitter. A Δ-Σ fractional-N PLL with a multi-phase relaxation oscillator is designed to enable sub-carrier modulation with reduced quantization noise. The triangular waveform output of the relaxation oscillator directly modulates an LC VCO to have the UWB-compliant spectrum. The center frequency of the LC VCO is quasi-continuously tuned by a Δ-Σ DAC based frequency-locked loop with the power consumption of 1.1mW. The 3.43-4.03GHz FM-UWB transmitter implemented in 0.18μm CMOS consumes the total power of 9.6mW.