Investigation of non-linear operation of PLL FM demodulators

P. V. Brennan*, R. J. Bullock, R. Clement, P. D. Smith, S. M. Booker, D. Broomhead

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The non-linear behavior of PLL FM demodulators were investigated theoretically and experimentally. A test circuit with a complete receiver, a PLL FM demodulator, and measurement system was devised in order to excite an second order type II PLL with arbitrary FM waveforms. Phase error and/or VCO tuning voltage variation were recorded in order to generate a range of parameters using Matlab, Poincaré sections, phase-plane portraits, VCO spectra and bifurcation diagrams. An optimum waveform was derived, which was capable of causing a non-linear response with minimum peak deviation.

Original languageEnglish
Pages (from-to)23-28
Number of pages6
JournalIEE Colloquium (Digest)
Issue number102
Publication statusPublished - 5 May 1999
Externally publishedYes


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