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

  • Rasmus S. Michaelsen (a1) (a2), Tom K. Johansen (a1), Kjeld M. Tamborg (a2), Vitaliy Zhurbenko (a1) and Lei Yan (a1)...
Abstract

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.

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Corresponding author
Corresponding author: R.S. Michaelsen Email: rsm@weibel.dk
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

[1] B. Razavi : Design considerations for direct-conversion receivers. IEEE Trans. Circuits Syst. II: Analog Digital Signal Process., 44 (6) (1997), 428435.

[6] T.-G. Ma ; C.-C. Wang ; C-.H. Lai : Miniaturized distributed Marchand balun using coupled synthesized CPWs. IEEE Microw. Wireless Compon. Lett., 21 (2011), 188190.

[9] X. Miao ; W. Zhang ; Y. Geng ; X. Chen ; R. Ma ; J. Gao : Design of compact frequency-tuned microstrip balun. IEEE Antennas Wireless Propag. Lett., 9 (2010), 686688.

[10] R. Michaelsen ; T. Johansen ; K. Tamborg ; V. Zhurbenko : a modified Marchand balun configuration with tunable phase balance. IEEE Microw. Wireless Compon. Lett., 23 (2013), 6668.

[11] R. Michaelsen ; T. Johansen ; K. Tamborg ; V. Zhurbenko : Design of a broadband passive X-band double-balanced mixer in SiGe HBT technology. Int. J. Microw. Wireless Technol., 6 (2014), 235242.

[17] M. Sudow ; K. Andersson ; P-A. Nilsson ; N. Rorsman : A highly linear double balanced Schottky diode S-band mixer. IEEE Microw. Wireless Compon. Lett., 16 (2006), 336338.

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International Journal of Microwave and Wireless Technologies
  • ISSN: 1759-0787
  • EISSN: 1759-0795
  • URL: /core/journals/international-journal-of-microwave-and-wireless-technologies
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