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IP2 calibrator using common mode feedback circuitry

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7 Author(s)
Woonyun Kim ; Syst. LSI Bus., Samsung Electron. Co. Ltd., Yongin, South Korea ; Sung-Gi Yang ; Yeon-kug Moon ; Jinhyuck Yu
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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.

Published in:

Proceedings of the 31st European Solid-State Circuits Conference, 2005. ESSCIRC 2005.

Date of Conference:

12-16 Sept. 2005