Analysis and Modeling of N-Path Circuits Peak Frequency Shift Caused by Switch Parasitics

Erez Zolkov, Emanuel Cohen

Research output: Contribution to journalArticlepeer-review


The N-path circuit serves both as a mixer and as a radio frequency (RF) filter. Certain performance aspects, such as noise, linearity, and out-of-band (OOB) rejection dictate large switches size. However, such increment raises the value of the parasitic RF capacitance, which causes further in-band (IB) loss and peak frequency shift. In this brief, we derive simplified equations for the assessment of the mentioned non-ideal properties, using the novel linear periodically time-variant (LPTV) state-space analysis, by making derivations and approximations based on realistic circuit parameters. We present closed-form equations for the voltage gain peak frequency shift and a revised linear time-invariant (LTI) model for the assessment of S11 dip frequency shift.

Original languageEnglish
Pages (from-to)374-378
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number2
StatePublished - 1 Feb 2022


  • Band-Pass filter
  • Baseband
  • CMOS
  • Capacitance
  • Capacitors
  • LPTV circuits
  • Mathematical model
  • Mixer First
  • Mixers
  • N-path filter.
  • Switches
  • Switching circuits

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


Dive into the research topics of 'Analysis and Modeling of N-Path Circuits Peak Frequency Shift Caused by Switch Parasitics'. Together they form a unique fingerprint.

Cite this