A 0.13μm CMOS Δ ∑ fractional-N frequency synthesizer for WLAN transceivers  

作　　者：楚晓杰 贾海珑 林敏 石寅 代伐 

机构地区：[1]Institute of Semiconductors,Chinese Academy of Sciences [2]Department of Electrical and Computer Engineering,Auburn University

出　　处：《Journal of Semiconductors》2011年第10期113-119,共7页半导体学报（英文版）

摘　　要：A fractional-N frequency synthesizer fabricated in a 0.13μm CMOS technology is presented for the application of IEEE 802.11 b/g wireless local area network（WLAN） transceivers.A monolithic LC voltage controlled oscillator（VCO） is implemented with an on-chip symmetric inductor.The fractional-TV frequency divider consists of a pulse swallow frequency divider and a 3rd-order multistage noise shaping（MASH）△Σmodulator with noise-shaped dithering techniques.Measurement results show that in all channels,phase noise of the synthesizer achieves -93 dBc/Hz and -118 dBc/Hz in band and out of band respectively with a phase-frequency detector （PFD） frequency of 20 MHz and a loop bandwidth of 100 kHz.The integrated RMS phase error is no more than 0.8°.The proposed synthesizer consumes 8.4 mW from a 1.2 V supply and occupies an area of 0.86 mm^2.A fractional-N frequency synthesizer fabricated in a 0.13μm CMOS technology is presented for the application of IEEE 802.11 b/g wireless local area network（WLAN） transceivers.A monolithic LC voltage controlled oscillator（VCO） is implemented with an on-chip symmetric inductor.The fractional-TV frequency divider consists of a pulse swallow frequency divider and a 3rd-order multistage noise shaping（MASH）△Σmodulator with noise-shaped dithering techniques.Measurement results show that in all channels,phase noise of the synthesizer achieves -93 dBc/Hz and -118 dBc/Hz in band and out of band respectively with a phase-frequency detector （PFD） frequency of 20 MHz and a loop bandwidth of 100 kHz.The integrated RMS phase error is no more than 0.8°.The proposed synthesizer consumes 8.4 mW from a 1.2 V supply and occupies an area of 0.86 mm^2.

关 键 词：WLAN IEEE 802.11 b/g frequency synthesizer voltage controlled oscillator △∑modulator 

分 类 号：TN74[电子电信—电路与系统]