A 77 GHz SiGe sub-harmonic balanced mixer

A novel SiGe 77 GHz sub-harmonic balanced mixer is presented with a goal to push the technology to its limit [SiGe2-RF transistor (f/sub T/=80 GHz)]. This new topology uses a compact input network not only to achieve high isolation between the LO and RF ports, but also to result in excellent 2LO-RF isolation. The measured results demonstrate a conversion gain of 0.7 dB at 77 GHz with an LO power of 10 dBm at 38 GHz, LO-RF isolation better than 30 dB, 2LO-RF isolation of 25 dB, and a P/sub 1dB/ of -8 dBm. The mixer core consumes 4.4 mA at 5 V. The circuit demonstrates that SiGe sub-harmonic mixers have comparable performance with GaAs designs, at a fraction of the cost.

[1]  P. Nuchter,et al.  Eight-channel 77-GHz front-end module with high-performance synthesized signal generator for FM-CW sensor applications , 2004, IEEE Transactions on Microwave Theory and Techniques.

[2]  L. Larson,et al.  A wide-bandwidth Si/SiGe HBT direct conversion sub-harmonic mixer/downconverter , 2000, IEEE Journal of Solid-State Circuits.

[3]  Sung-Chan Kim,et al.  A high performance V-band monolithic quadruple sub-harmonic mixer , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[4]  G.M. Rebeiz,et al.  A 1.9 GHz double-balanced subharmonic mixer for direct conversion receivers , 2001, 2001 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium (IEEE Cat. No.01CH37173).

[5]  S. Raman,et al.  A 60 GHz uniplanar MMIC 4X subharmonic mixer , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

[6]  Dan An,et al.  High conversion gain V-band quadruple subharmonic mixer using cascode structure , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[7]  B. Floyd,et al.  V-band and W-band SiGe bipolar low-noise amplifiers and voltage-controlled oscillators , 2004, 2004 IEE Radio Frequency Integrated Circuits (RFIC) Systems. Digest of Papers.

[8]  K. Kanaya,et al.  A 94 GHz high performance quadruple subharmonic mixer MMIC , 2002, 2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278).

[9]  Gabriel M. Rebeiz,et al.  A high-performance W-band uniplanar subharmonic mixer , 1997 .

[10]  Stephen A. Maas,et al.  The RF and microwave circuit design cookbook , 1998 .

[11]  Jin-Koo Rhee,et al.  High-performance V-band monolithic quadruple sub-harmonic mixer with anti-parallel diode pair , 2004 .

[12]  Pei-Si Wu,et al.  Design and analysis of a miniature W-band MMIC subharmonically pumped resistive mixer , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[13]  Sanjay Raman,et al.  A 60-GHz uniplanar MMIC 4/spl times/ subharmonic mixer , 2002 .

[14]  Yuh-Jing Hwang,et al.  A W-band subharmonically pumped monolithic GaAs-based HEMT gate mixer , 2004 .