Demodulators – Frequency modulation demodulator – Input signal split into plural signals
Patent
1992-12-22
1994-04-12
Mis, David
Demodulators
Frequency modulation demodulator
Input signal split into plural signals
455214, 455337, H03D 300
Patent
active
053029100
ABSTRACT:
In an FM detector circuit, a phase-shifting circuit is constituted by integrating circuits each consisting of a transconductance amplifier and capacitor. The phase-shifting circuit being arranged to cause limiter signal to be phase-shifted by 90 degrees at center frequency. A multiplying circuit is provided which is arranged to be provided with said limiter signal and output of said phase-shifting circuit, thereby effecting phase-detection of said limiter signal. Further, an error amplifier is provided which is supplied with a smoothed version of detection output derived from said multiplying circuit. The arrangement is made such that output of the error amplifier is applied to the transconductance amplifiers constituting said phase-shifting circuit.
REFERENCES:
patent: 3792367 (1974-02-01), Fleischer et al.
patent: 4451792 (1984-05-01), Gay
IEEE Transactions on Circuit Theory, Lee C. Thomas, "The Biquad: Part 1--Some Practical Design Considerations", May 1971, vol. CT-18, No. 3, pp. 350-357.
IEEE Transactions on Circuit Theory, Lee C. Thomas, "The Biquad: Part 2--A Multipurpose Active Filtering System", May 1971, vol. CT-18, No. 3, pp. 358-361.
Fukai Isao
Kondo Hiroshi
Mis David
Toko Inc.
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