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A Fully Integrated Direct-Conversion Receiver for CDMA and GPS Applications

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8 Author(s)
K. Lim ; Future Commun. IC, Kyunggi-Do ; S. -H. Lee ; S. Min ; S. Ock
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This paper describes a fully integrated zero-IF receiver for cellular CDMA and GPS applications. The single-chip zero-IF receiver integrates the entire signal path for CDMA and GPS bands, including a low-noise amplifier (LNA), I/Q down-converters, baseband channel selection filters (CSFs), a voltage-controlled oscillator (VCO), and a local oscillator (LO) distribution circuit for each band. The cellular-band LNA achieves a noise figure (NF) of 1.2 dB, input third-order intercept point (IIP3) of 11 dBm, and gain of 15.5 dB. Cellular I/Q down-converter and baseband circuitries show 9-dB composite NF, 9 dBm IIP3 and 60-dBm input second-order intercept point (IIP2) without IIP2 calibration. The measured LO leakage is less than -110 dBm at LNA input. The phase noise of the cellular VCO is -134 dBc/Hz at 900-kHz offset with 1.76-GHz carrier frequency. Total GPS signal path achieves NF of 1.7 dB and gain of 74 dB with 42-mA current. The receiver is fabricated in a 0.35-mum SiGe BiCMOS process and packaged in a 6 mm times 6 mm 40-pin micro-lead-frame. Handset measurements report that the receiver meets or exceeds all of the CDMA-2000 requirements

Published in:

IEEE Journal of Solid-State Circuits  (Volume:41 ,  Issue: 11 )