A 5 GHz-band SiGe-MMIC direct quadrature modulator using a doubly stacked polyphase filter

Kensuke Nakajima, Takayuki Sugano, Noriharu Suematsu

Research output: Contribution to conferencePaper

11 Citations (Scopus)

Abstract

A 5 GHz-band SiGe-MMIC direct quadrature modulator using a doubly stacked polyphase filter (PPF) is described. The doubly stacked PPF can dramatically reduce the output phase and magnitude imbalance corresponding to the transmission line length inside of the RC PPF networks. The quadrature modulator using two-stage doubly stacked PPF performs the error vector magnitude of 3.6%rms, magnitude error of 3.0%rms, and phase error of 1.2 deg at LO frequency of 5.8 GHz for π/4-shifted QPSK (2Msps) modulated signals. Wideband characteristics from 5.0 to 6.5 GHz are also demonstrated. This modulator dissipates 11.3 mA at 3.3 V supply voltage.

Original languageEnglish
Pages409-412
Number of pages4
Publication statusPublished - 2004 Sep 20
Externally publishedYes
EventDigest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium - Fort Worth, TX, United States
Duration: 2004 Jun 62004 Jun 8

Other

OtherDigest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium
CountryUnited States
CityFort Worth, TX
Period04/6/604/6/8

Keywords

  • Direct conversion
  • Polyphase filter (PPF)
  • Quadrature modulator
  • SiGe-MMIC

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Nakajima, K., Sugano, T., & Suematsu, N. (2004). A 5 GHz-band SiGe-MMIC direct quadrature modulator using a doubly stacked polyphase filter. 409-412. Paper presented at Digest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Fort Worth, TX, United States.