Simple, Analytical Expressions of an Effect of Local Signal Imperfections on Four-Phase Passive-Mixer-Based Bandpass Filter

Kazuki Kishida, Tadashi Maeda

Research output: Contribution to journalArticle


This paper describes simple, analytical expressions for a quadrature passive-mixer-based RF bandpass filter. We have analyzed the passive mixer clocked by the trapezoidal-shaped local (LO) signals with different rise and fall times. Obtained results show that the partially overlapping LO signals and/or large capacitance of low-noise amplifier load cause charge reduction of each baseband branch capacitance. This results in the filter characteristics degradation. To achieve good filter characteristics, short rise and fall time of the LO signal and/or appropriate mixer RF-node biasing is effective. Our analysis results agreed well with the data obtained from the Advanced Design System simulator.

Original languageEnglish
Article number8440114
Pages (from-to)147-160
Number of pages14
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number1
Publication statusPublished - 2019 Jan 1



  • Analytical expression
  • bandpass filter
  • CMOS
  • fall-time
  • four-phase passive-mixer
  • Fourier transform
  • LO signal imperfection
  • Q-factor
  • rise-time
  • stopband attenuation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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