A 2 GHz-band self frequency dividing quadrature mixer

A 2 GHz-band self frequency dividing quadrature mixer (SFDQM) is proposed. The SFDQM uses a static-type 1/2 frequency divider as LO switching circuit, and needs no external 90 degree phase shifter. As the inputs of the mixer, a differential 2f/sub LO/ signal and an f/sub RF/ signal are required to produce a quadrature base band (BB) signal. Since this mixer can eliminate a 90 degree phase shifter and one of the unit mixer blocks having an LO amplifier, it realizes very low power consumption and very small die area on an IC chip. The SFDQM is fabricated in 0.35 /spl mu/m SiGe-BiCMOS technology and its down conversion characteristics are evaluated in the 2 GHz-band. It performs a conversion gain of 18.5 dB and an NF of 15.1 dB with current consumption of 3 mA and die area of 0.22/spl times/0.31 mm/sup 2/.

[1]  N. Suematsu,et al.  0.8-5.2 GHz band SiGe-MMIC Q-MIX for a multi-band multi-mode direct conversion receiver , 2004, Proceedings. 2004 IEEE Radio and Wireless Conference (IEEE Cat. No.04TH8746).

[2]  H. Pretl.  AW-CDMA Zero-IF Front-End for UMTS in a 75GHz SiGe BiCMOS Technology , 2001 .

[3]  H. Tanimoto,et al.  A 1.9 GHz Si direct conversion receiver IC for QPSK modulation systems , 1995, Proceedings ISSCC '95 - International Solid-State Circuits Conference.

[4]  T. Maeda,et al.  Design study on a direct conversion receiver front-end for 280 MHz, 900 MHz, and 2.6 GHz band radio communication systems , 1991, [1991 Proceedings] 41st IEEE Vehicular Technology Conference.

[5]  Noriharu Suematsu,et al.  Even harmonic type direct conversion receiver ICs for mobile handsets: design challenges and solutions , 1999, 1999 IEEE Radio Frequency Integrated Circuits Symposium (Cat No.99CH37001).

[6]  C. Saint,et al.  A direct-conversion W-CDMA front-end SiGe receiver chip , 2002, 2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.02CH37280).

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

[8]  N. Suematsu,et al.  An even harmonic type direct conversion SiGe-MMIC receiver for W-CDMA mobile terminals , 2002, 2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.02CH37280).

[9]  R. Weigel,et al.  A W-CDMA zero-IF front-end for UMTS in a 75 GHz SiGe BiCMOS technology , 2001, 2001 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium (IEEE Cat. No.01CH37173).