Passive Biotelemetry by Frequency Keying

Bruce C. Towe

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


A novel method for passive biotelemetry is presented which has the advantages of greater range and the ability to telemeter bioelectric data compared to conventional passive telemetry approaches. The technique relays bioelectric waveforms by FM encoding the rate at which a passive L-C circuit is shifted between two different resonant frequencies. Power is intermittently absorbed from a base unit transmitter tuned to one of the frequencies. By sensing the intermittent power absorption, the base unit can recover biopotential waveforms by FM demodulation. Good quality biopotential waveforms have been telemetered over distances up to 1 m with essentially no power expended by the remote unit to generate an RF carrier wave. Only very small amounts of power are required for the remote unit's internal biopotential amplifier.

Original languageEnglish (US)
Pages (from-to)905-909
Number of pages5
JournalIEEE Transactions on Biomedical Engineering
Issue number10
StatePublished - Oct 1986

ASJC Scopus subject areas

  • Biomedical Engineering


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