Concurrent multi-band mixer with independent and linear gain control

Takana Kaho, Yo Yamaguchi, Hiroyuki Shiba, Tadao Nakagawa, Kazuhiro Uehara, Kiyomichi Araki

Research output: Contribution to journalArticlepeer-review


Novel multi-band mixers that can receive multiple band signals concurrently are proposed and evaluated. The mixers achieve independent gain control through novel relative power control method of the multiple local oscillator (LO) signals. Linear control is also achieved through multiple LO signal input with total LO power control. Theoretical analysis shows that odd-order nonlinearity components of the multiple LO signals support linear conversion gain control. Dual- and triple-band tests are conducted using typical three MOSFET mixers fabricated by a 0.25 μm SiGe BiCMOS process. Measurements confirm over 40 dB independent control of conversion gain, linear control achieved through LO input power control. The proposed mixers have high input linearity with a 5 dBm output third intercept point. A method is also proposed to reduce interference caused by mixing between multiple LO signals.

Original languageEnglish
Pages (from-to)659-668
Number of pages10
JournalIEICE Transactions on Electronics
Issue number7
Publication statusPublished - Jul 1 2015
Externally publishedYes


  • Concurrent multi-band mixer
  • Dual-band
  • Flexible wireless system
  • SiGe bicmos
  • Triple-band

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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