题目/Title：
                        A wide range sigma-delta fractional-N frequency synthesizer with adaptive frequency calibration

作者/Author：魏建军,姜汉钧,张凌伟,董晶晶,李福乐,王志华,张春
                        Jianjun Wei,Hanjun Jiang,Lingwei Zhang,Jinjin Dong,Fule Li,Zhihua Wang,Chun Zhang

期刊/Journal：半导体学报 Journal of Semiconductors

年份/Issue Date：2013.Jun.

卷（期）及页码/Volume（No.）&pages：Vol.34, No.6, pp. 065002-1-5

摘要/Abstract：

A wide range fractional-N frequency synthesizer in 0.18 μm RF CMOS technology is implemented. A switched-capacitors bank LC-tank VCO and an adaptive frequency calibration technique are used to expand the frequency range. A 16-bit third-order sigma-delta modulator with dither is used to randomize the fractional spur. The active area is 0.6 mm2. The experimental results show the proposed frequency synthesizer consumes 4.3 mA from a single 1.8 V supply voltage except for buffers. The frequency range is 1.44-2.11 GHz and the frequency resolution is less than 0.4 kHz. The phase noise is -94 dBc/Hz @ 100 kHz and -121 dBc/Hz @ 1 MHz at the output of the prescaler with a loop bandwidth of approximately 120 kHz. The performance meets the requirements for the multi-band and multi-mode transceiver applications.