Title :
A low-cost, multi-standard Δ∑ fractional-N synthesizer design for WiMAX/WLAN applications
Author :
Sun, Yuanfeng ; Qiao, Jian ; Li, Jun ; He, Rui ; Liu, Chengwen ; Rhee, Woogeun ; Woo, Sung Hun ; Wang, ZhiHua
Author_Institution :
Inst. of Microelectron., Tsinghua Univ., Beijing, China
Abstract :
A ΔΣ fractional-N synthesizer design for multi-standard WiMAX/WLAN applications is presented. By having a VCO frequency of up to four times the channel frequency, the tuning range requirement of the VCO is significantly relaxed. Two low-noise LC VCOs with small inductor area are designed to cover three frequency bands for WiMAX/WLAN applications, where only one polyphase filter is used to generate multi-band quadrature outputs. Based on noise analysis, a low power 12 GHz frequency divider having an optimum partition among asynchronous, CML, and single-ended operations is designed. The prototype synthesizer implemented in 90 nm CMOS consumes about 58 mW from a 1.2 V supply.
Keywords :
WiMax; delta-sigma modulation; frequency dividers; frequency synthesizers; voltage-controlled oscillators; VCO frequency; WLAN; WiMAX; channel frequency; frequency 12 GHz; frequency divider; low-cost multi-standard ΔΣ fractional-N synthesizer design; power 58 mW; size 90 nm; voltage 1.2 V; Synthesizers; WiMAX; Wireless LAN;
Conference_Titel :
SoC Design Conference (ISOCC), 2009 International
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5034-3
Electronic_ISBN :
978-1-4244-5035-0
DOI :
10.1109/SOCDC.2009.5423881
