Group-delay measurement of frequency-converting devices using a comb generator

Jonathan Scott, Michael Hoy

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


We propose a new method for the measurement of (group) delay from the radio-frequency (RF) input to the intermediate-frequency (IF) output of a mixer or a receiver. The method is particularly convenient for measuring the change in group delay with the local-oscillator (LO) tuning frequency of the receiver since the method does not require access to, or even knowledge of, the LO signal. The method employs a calibrated comb (impulse) generator. Other required equipment is limited to a reference signal generator and a digitizer of modest bandwidth, allowing the measurement to rely on a low-frequency generator and an oscilloscope. Simulated and measured data are presented to verify the approach.
Original languageEnglish
Pages (from-to)3012-3017
Number of pages6
JournalIEEE Transactions on Instrumentation and Measurement
Issue number11
Publication statusPublished - 2010
Externally publishedYes


  • Delay estimation
  • Frequency conversion
  • Impulse testing
  • Microwave measurements
  • Microwave mixers
  • Phase measurement
  • Pulse measurements


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