题目/Title：Reconfigurable FM-UWB Transmitter

作者/Author：
                        Bo Zhou,Woogeun Rhee,Zhihua Wang

期刊/Journal：Electronics Letters

年份/Issue Date：201112 May

卷（期）及页码/Volume（No.）&pages：Vol.47, No.10, pp. 628 - 629

摘要/Abstract：
A 100kb/s frequency modulated ultra wideband (FM-UWB) transmitter with digitally reconfigurable subcarrier modulation index (βsub), radio-frequency bandwidth (BRF) and carrier frequency band is presented and fabricated in 0.18μm CMOS. A delta-sigma (∆-Σ) fractional-N phase-locked loop (PLL) with an amplitude-controlled relaxation VCO and digitally configurable 2-FSK modulation is designed for subcarrier generation, followed by a dual-path LC VCO whose center frequency is set by a digitally configurable duty-cycled frequency-locked loop (FLL) for nearly 600MHz UWB signal generation.