CMOS analog baseband circuitry for an IEEE 802.11 b/g/n WLAN transceiver  

作　　者：龚正 楚晓杰 雷倩倩 林敏 石寅 

机构地区：[1]Institute of Semiconductors,Chinese Academy of Sciences [2]Suzhou-CAS Semiconductors Integrated-Technology Research Center [3]Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083

出　　处：《Journal of Semiconductors》2012年第11期60-66,共7页半导体学报（英文版）

摘　　要：An analog baseband circuit for a direct conversion wireless local area network（WLAN） transceiver in a standard 0.13-μm CMOS occupying 1.26 mm^2 is presented.The circuit consists of active-RC receiver（RX） 4th order elliptic lowpass filters（LPFs）,transmitter（TX） 3rd order Chebyshev LPFs,RX programmable gain amplifiers （PGAs） with DC offset cancellation（DCOC） servo loops,and on-chip output buffers.The RX baseband gain can be programmed in the range of -11 to 49 dB in 2 dB steps with 50-30.2 nV/（Hz）^（1/2） input referred noise（IRN） and a 21 to -41 dBm in-band 3rd order interception point（IIP3）.The RX/TX LPF cutoff frequencies can be switched between 5 MHz,10 MHz,and 20 MHz to fulfill the multimode 802.11b/g/n requirements.The TX baseband gain of the I/Q paths are tuned separately from -1.6 to 0.9 dB in 0.1 dB steps to calibrate TX 1/Q gain mismatches.By using an identical integrator based elliptic filter synthesis method together with global compensation applied to the LPF capacitor array,the power consumption of the RX LPF is considerably reduced and the proposed chip draws 26.8 mA/8 mA by the RX/TX baseband paths from a 1.2 V supply.An analog baseband circuit for a direct conversion wireless local area network（WLAN） transceiver in a standard 0.13-μm CMOS occupying 1.26 mm^2 is presented.The circuit consists of active-RC receiver（RX） 4th order elliptic lowpass filters（LPFs）,transmitter（TX） 3rd order Chebyshev LPFs,RX programmable gain amplifiers （PGAs） with DC offset cancellation（DCOC） servo loops,and on-chip output buffers.The RX baseband gain can be programmed in the range of -11 to 49 dB in 2 dB steps with 50-30.2 nV/（Hz）^（1/2） input referred noise（IRN） and a 21 to -41 dBm in-band 3rd order interception point（IIP3）.The RX/TX LPF cutoff frequencies can be switched between 5 MHz,10 MHz,and 20 MHz to fulfill the multimode 802.11b/g/n requirements.The TX baseband gain of the I/Q paths are tuned separately from -1.6 to 0.9 dB in 0.1 dB steps to calibrate TX 1/Q gain mismatches.By using an identical integrator based elliptic filter synthesis method together with global compensation applied to the LPF capacitor array,the power consumption of the RX LPF is considerably reduced and the proposed chip draws 26.8 mA/8 mA by the RX/TX baseband paths from a 1.2 V supply.

关 键 词：WLAN analog baseband active-RC filters PGA DCOC operational amplifiers 

分 类 号：TN925.93[电子电信—通信与信息系统] TN859[电子电信—信息与通信工程]