A direct conversion receiver with an IP2 calibrator for CDMA/PCS/GPS/AMPS applications

A second-order intercept point (IP2) calibration technique is developed using common-mode feedback (CMFB) circuitry in a direct-conversion receiver for wireless CDMA/PCS/GPS/AMPS applications. The IP2 calibrator is capable of providing different CMFB gain to tune its common-mode output impedance for each of the positive and negative mixer outputs. The CDMA mixer applying this method achieved a second-order input intercept point (IIP2) of 64 dBm, a third-order input intercept point (IIP3) of 4 dBm, a noise figure of 6.5 dB and a voltage gain of 42.2 dB. This result shows a 20 dB improvement from an uncalibrated IIP2 of 44 dBm. The receiver RFIC is implemented in a 0.5-mum SiGe BiCMOS process, and it operates from a 2.7 to 3.1 V single power supply

[1]  H. Kokatsu,et al.  An I/Q active balanced harmonic mixer with IM2 cancelers and a 45/spl deg/ phase shifter , 1998, 1998 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, ISSCC. First Edition (Cat. No.98CH36156).

[2]  Bumman Kim,et al.  Second order nonlinearity analysis of Gilbert mixer , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[3]  Danilo Manstretta,et al.  Analysis and optimization of IIP2 in CMOS direct down-converters , 2002, Proceedings of the IEEE 2002 Custom Integrated Circuits Conference (Cat. No.02CH37285).

[4]  Behzad Razavi,et al.  Design considerations for direct-conversion receivers , 1997 .

[5]  A. Molnar,et al.  A single-chip quad-band (850/900/1800/1900 MHz) direct-conversion GSM/GPRS RF transceiver with integrated VCOs and fractional-N synthesizer , 2002, 2002 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.02CH37315).

[6]  A. A. Abidi,et al.  General relations between IP2, IP3, and offsets in differential circuits and the effects of feedback , 2003 .

[7]  J. Ryynanen,et al.  A 22 mA 3.7 dB NF direct conversion receiver for 3G WCDMA , 2001, 2001 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC (Cat. No.01CH37177).

[8]  M. Hafizi,et al.  RF front-end of direct conversion receiver RFIC for cdma-2000 , 2004, IEEE Journal of Solid-State Circuits.

[9]  Robert G. Meyer,et al.  Monolithic RF active mixer design , 1999 .

[10]  E. Bautista,et al.  Improved mixer IIP2 through dynamic matching , 2000, 2000 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.00CH37056).

[11]  Deog-Kyoon Jeong,et al.  Full-CMOS 2-GHz WCDMA direct conversion transmitter and receiver , 2003 .

[12]  Ramesh Harjani,et al.  Analysis and design of an integrated quadrature mixer with improved noise, gain and image rejection , 2001, ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196).

[13]  Kari Halonen,et al.  An IIP2 calibration technique for direct conversion receivers , 2004, 2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512).

[14]  Kari Halonen,et al.  Characterization of IIP2 and DC-offsets in transconductance mixers , 2001 .