A Si-CMOS 5-bit baseband phase shifter using fixed gain amplifier matrix

Tuan Thanh Ta, Shoichi Tanifuji, Suguru Kameda, Noriharu Suematsu, Tadashi Takagi, Kazuo Tsubouchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

For millimeter wave beam forming system, instead of using phase shifter at very high frequency of radio frequency (RF) or local oscillator (LO) frequency, low frequency baseband (BB) phase shifter has more potential for realization. Conventional BB phase shifters use variable gain amplifiers (VGA), which have low linearity, and calibration is required for over 3-bit BB phase shifters. In this paper, we propose a novel BB phase shifter using fixed gain amplifiers (FGA) matrix with in/out-phase switches. Since FGA normally has higher linearity than VGA, it is possible to reduce overall power consumption to achieve same linearity. FGA has fixed reflection and transfer characteristic, so mismatch between phase shift states are reduced. By dividing phase shifter into smaller stages, the effects of process mismatches on very nearby transistors are small. So proposed structure has robustness against process mismatch. Fabricated 5-bit BB phase shifter using proposed method has a very low power consumption to achieve almost same linearity as other works and has a 3-dB bandwidth of 1.2 GHz, 1.5° of rms phase error, lower than 0.2 dB of rms gain error without calibration. For ambient temperature from -20 °C to 80°C, simulated rms phase error varied by only 0.2°, and did not vary with process mismatch.

Original languageEnglish
Title of host publicationEuropean Microwave Week 2012
Subtitle of host publication"Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012
Pages576-579
Number of pages4
Publication statusPublished - 2012 Dec 1
Event7th European Microwave Integrated Circuits Conference, EuMIC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012 - Amsterdam, Netherlands
Duration: 2012 Oct 292012 Oct 30

Other

Other7th European Microwave Integrated Circuits Conference, EuMIC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012
CountryNetherlands
CityAmsterdam
Period12/10/2912/10/30

Keywords

  • Baseband
  • Broadband Communication
  • No Calibration
  • Phase Shifter

ASJC Scopus subject areas

  • Hardware and Architecture

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  • Cite this

    Ta, T. T., Tanifuji, S., Kameda, S., Suematsu, N., Takagi, T., & Tsubouchi, K. (2012). A Si-CMOS 5-bit baseband phase shifter using fixed gain amplifier matrix. In European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012 (pp. 576-579). [6483865]