An X-band Schottky diode mixer in SiGe technology with tunable Marchand balun

In this paper, we propose a double balanced mixer with a tunable Marchand balun. The circuit is designed in a SiGe BiCMOS process using Schottky diodes. The tunability of the Marchand balun is used to enhance critical parameters for double balanced mixers. The local oscillator-IF isolation can be changed from –51 to –60.5 dB by tuning. Similarly, the IIP2 can be improved from 41.3 to 48.7 dBm at 11 GHz, while the input referred 1-dB compression point is kept constant at 8 dBm. The tuning have no influence on conversion loss, which remains at 8.8 dB at a LO power level of 11 dBm at the center frequency of 11 GHz. The mixer has a 3 dB bandwidth from 8 to 13 GHz, covering the entire X-band. The full mixer has a size of 2050 μm × 1000 μm.

[1]  Runbo Ma,et al.  Design of Compact Frequency-Tuned Microstrip Balun , 2010, IEEE Antennas and Wireless Propagation Letters.

[2]  V. Zhurbenko,et al.  A Modified Marchand Balun Configuration With Tunable Phase Balance , 2013, IEEE Microwave and Wireless Components Letters.

[3]  Tom K. Johansen,et al.  Design of a broadband passive X-band double-balanced mixer in SiGe HBT technology , 2014 .

[4]  J. Laskar,et al.  An 18 GHz low noise high linearity active mixer in SiGe , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[5]  V. Krozer,et al.  Analysis and design of lumped element Marchand baluns , 2008, MIKON 2008 - 17th International Conference on Microwaves, Radar and Wireless Communications.

[6]  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).

[7]  Kian Sen Ang,et al.  Analysis and design of miniaturized lumped-distributed impedance-transforming baluns , 2003 .

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

[9]  R. Michaelsen,et al.  Investigation of LO-leakage cancellation and DC-offset influence on flicker-noise in X-band mixers , 2012, 2012 7th European Microwave Integrated Circuit Conference.

[10]  J.B. Johnson,et al.  Schottky Barrier Diodes for Millimeter Wave SiGe BiCMOS Applications , 2006, 2006 Bipolar/BiCMOS Circuits and Technology Meeting.

[11]  Thorsten Gerber,et al.  Handbook Of Mathematical Functions , 2016 .

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

[13]  Tom K. Johansen,et al.  Design of a ×4 subharmonic sub-millimeter wave diode mixer, based on an analytic expression for small-signal conversion admittance parameters , 2013, 2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC).

[14]  Vitaliy Zhurbenko,et al.  A passive x-band double balanced mixer utilizing diode connected SiGe HBTs , 2013, 2013 European Microwave Integrated Circuit Conference.

[15]  Tzyh-Ghuang Ma,et al.  Miniaturized Distributed Marchand Balun Using Coupled Synthesized CPWs , 2011, IEEE Microwave and Wireless Components Letters.

[16]  M. Sudow,et al.  A highly linear double balanced Schottky diode S-band mixer , 2006, IEEE Microwave and Wireless Components Letters.