A 60-GHz Millimeter-wave CMOS Marchand Balun

A novel 60-GHz wideband Marchand balun fabricated with a standard 0.18 mum 6-metal-layer CMOS process for millimeter-wave applications is presented. A technique for achieving good balance with the fourth metal layer microstrip conductor is used in the designed Marchand balun. The fabricated CMOS balun uses multilayer coupling with the top two layers. An output matching network is added to improve the output return loss. The measured amplitude imbalance was about plusmn 1.5 dB from 25 to 65 GHz , over the 89% operating frequency band.

[1]  J. Schellenberg,et al.  Low-loss, planar monolithic baluns for K/Ka-band applications , 1999, 1999 IEEE MTT-S International Microwave Symposium Digest (Cat. No.99CH36282).

[2]  Kian Sen Ang,et al.  Multisection impedance-transforming coupled-line baluns , 2003 .

[3]  Mitchai Chongcheawchamnan,et al.  Miniaturised and multilayer Wilkinson divider and balun for microwave and millimeter-wave applications , 2001, 6th IEEE High Frequency Postgraduate Colloquium (Cat. No.01TH8574).

[4]  Ian D. Robertson,et al.  Analysis and design of impedance-transforming planar Marchand baluns , 2001 .

[5]  Sheng-Fuh Chang,et al.  A 20-40 GHz monolithic doubly-balanced mixer using modified planar Marchand baluns , 2001, APMC 2001. 2001 Asia-Pacific Microwave Conference (Cat. No.01TH8577).

[6]  I.D. Robertson,et al.  On miniaturization isolation network of an all-ports matched impedance-transforming Marchand Balun , 2003, IEEE Microwave and Wireless Components Letters.

[7]  K. C. Gupta,et al.  A generalized model for coupled lines and its applications to two-layer planar circuits , 1992 .

[8]  Ian D. Robertson,et al.  40 to 90 GHz impedance-transforming CPW Marchand balun , 2000, 2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017).

[9]  Cam Nguyen,et al.  Computer-aided analysis and design of a planar multilayer Marchand balun , 1994 .

[10]  M.Y.W. Chia,et al.  A new planar marchand balun , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[11]  N. Marchand,et al.  Transmission-line Conversion Transformers , 1944 .