KU-band SiGe HBT I/Q subharmonic mixer with reactive quadrature generators

Sheng Che Tseng, Jin Siang Syu, Jen Yi Su, Hung Ju Wei, Chin-Chun Meng*, Guo Wei Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This article demonstrates a high-frequency 0.35-μm SiGe HBT subharmonic downconverter with reactive in-phase and quadrature-phase (I/Q) generators. Two reactive I/Q generators are integrated in our work to provide differential quadrature RF and LO signal. The I/Q subharmonic downconverter with single-ended LO, RF, and IF (I/Q) ports has a conversion gain of 1 dB, IP1dB of -10 dBm, IIP3 of 0 dBm, and IIP2 of 21 dBm at 16.4 GHz. The magnitude and phase errors between the I and Q channels are 1.34% and 0.6°, respectively. The dc power consumption of this I/Q mixer without output buffers is approximately 5 mW.

Original languageEnglish
Pages (from-to)1516-1520
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number7
StatePublished - 1 Jul 2010


  • Direct conversion
  • I/Q
  • SiGe HBT
  • Subharmonic
  • Transformer

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