Analysis and Design of Two-Port N-Path Bandpass Filters with Embedded Phase Shifting

Negar Reiskarimian, Jin Zhou, Tsung Hao Chuang, Harish Krishnaswamy

Research output: Contribution to journalArticlepeer-review


N-path switched-RC circuits are a promising solution for realizing tunable high-Q filters on chip. Here, a novel method of embedding phase-shifting functionality into the two-port N-path filter response by shifting the phase of the input and output clock sets relative to each other is introduced. Furthermore, a two-port design allows us to embed variable attenuation that can be useful in applications such as wideband self-interference cancellers and phased-array front ends, where filtering, phase shifting, and variable gain are functionally required. The effect of the embedded phase shift is analyzed with linear periodically time-variant theory and has been verified through simulations and measurement. Measurement results are presented for a two-port N-path filter implemented in a 65-nm CMOS 0.8-1.4-GHz highly reconfigurable self-interference canceling receiver. The two-port filter achieves 13-dB gain control and full 360° phase-shift range for the in-band transfer function.

Original languageEnglish (US)
Article number7407340
Pages (from-to)728-732
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number8
StatePublished - Aug 2016
Externally publishedYes


  • Bandpass filter
  • N-path filter
  • Tunable filter
  • frequency translated filter
  • high-Q
  • linear periodically time-variant (LPTV)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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