Title :
IP2 calibrator using common mode feedback circuitry
Author :
Kim, Woonyun ; Yang, Sung-Gi ; Moon, Yeon-Kug ; Yu, Jinhyuck ; Shin, Heeseon ; Choo, Wooseung ; Park, Byeong-Ha
Author_Institution :
Syst. LSI Bus., Samsung Electron. Co. Ltd., Yongin, South Korea
Abstract :
An IP2 calibration technique is developed using the common mode feedback circuitry in a direct-conversion receiver for wireless CDMA/PCS/GPS/FM applications. The IP2 calibrator is capable of providing a different CMFB gain to tune its common mode output impedance for each of the positive and negative mixer outputs. The method performs a 20-dB improvement in IIP2. The CDMA mixer achieves an uncalibrated IIP2 of 44 dBm, an IIP3 of 4 dBm, a noise figure of 6.5 dB and a voltage gain of 42.2 dB. The receiver RFIC is implemented in a 0.5 μm SiGe BiCMOS process, and it operates from a 2.7 to 3.1 V single power supply. It exceeds all CDMA requirements when tested individually or on a handset.
Keywords :
BiCMOS integrated circuits; Ge-Si alloys; Global Positioning System; circuit feedback; code division multiple access; mixers (circuits); radio receivers; radiofrequency integrated circuits; semiconductor materials; 0.5 micron; 2.7 to 3.1 V; 42.2 dB; 6.5 dB; BiCMOS process; CDMA mixer; CMFB gain; IP2 calibrator; common mode feedback circuitry; common mode output impedance; direct-conversion receiver; receiver RFIC; wireless CDMA application; wireless FM application; wireless GPS application; wireless PCS application; Calibration; Feedback circuits; Gain; Global Positioning System; Impedance; Multiaccess communication; Noise figure; Personal communication networks; Radiofrequency integrated circuits; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 2005. ESSCIRC 2005. Proceedings of the 31st European
Print_ISBN :
0-7803-9205-1
DOI :
10.1109/ESSCIR.2005.1541602
