A Novel Broadband Active Balun

We have developed a novel broadband active balun. It consists of series-connected common-gate FETs and a common-source FET. The active balun achieved broadband characteristics by using series-connected common-gate FETs with the same gradient as the phase performance of the common-source FET. From 500 MHz to more than 10 GHz, the fabricated active balun shows a phase error of less than 5 degrees. A fabricated single balanced mixer using the proposed active balun had LO suppression of more than 40 dB over an LO frequency range of between 1 and 5 GHz.

[1]  I. D. Robertson,et al.  Monolithic MESFET distributed baluns based on the distributed amplifier gate-line termination technique , 1997 .

[2]  M. P. Ventresca,et al.  A compact wideband balanced mixer , 1994, 1994 IEEE MTT-S International Microwave Symposium Digest (Cat. No.94CH3389-4).

[3]  Kazuki Tateoka,et al.  A GaAs single balanced mixer MMIC with built-in active balun for personal communication systems , 1995, IEEE 1995 Microwave and Millimeter-Wave. Monolithic Circuits Symposium. Digest of Papers.

[4]  S. Lucyszyn,et al.  RFIC and MMIC Design and Technology , 2001 .

[5]  C. Zelley,et al.  A silicon MMIC active balun/buffer amplifier with high linearity and low residual phase noise , 2000, 2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017).

[6]  Yasuo Suzuki,et al.  Broadband RF stage architecture for software-defined radio in handheld terminal applications , 1999, IEEE Commun. Mag..