Demodulators – Frequency modulation demodulator – Input signal split into plural signals
Patent
1996-12-04
1998-08-11
Grimm, Siegfried H.
Demodulators
Frequency modulation demodulator
Input signal split into plural signals
333215, 455214, 455337, H03D 306, H03H 1150
Patent
active
057932514
ABSTRACT:
A demodulator circuit includes a gyrator circuit forming a derived equivalent inductance which is used in a demodulating circuit. The gyrator circuit has a first operational transconductance amplifier and a second operational transconductance amplifier, wherein a second input terminal of the first operational transconductance amplifier is connected to a first output terminal of the second operational transconductance amplifier. A second output terminal of the first operational transconductance amplifier is connected to a second input terminal of the second operational transconductance amplifier. Both of the second input terminal of the first operational transconductance amplifier and the second input terminal of the second operational transconductance amplifier are grounded via a constant dc voltage. A first output terminal of the first operational transconductance amplifier is connected to a first input terminal of the second operational transconductance amplifier. A capacitor is connected between the first and second output terminals of the first operational transconductance amplifier. A first input terminal of the first operational transconductance amplifier serves as an input terminal to the gyrator circuit. The capacitance C of the capacitor is determined so that C=LG.sup.2, where L stands for the desired equivalent inductance of the gyrator circuit as viewed from the input terminal thereof and G stands for the transconductance of each of the operational transconductance amplifiers employed in the gyrator circuit.
REFERENCES:
patent: 4963831 (1990-10-01), Stuivenwold et al.
D. Calder, "Audio Frequency Gyrator Filters for an Integrated Radio Paging Receiver," Mobile Radio Systems and Techniques, 10-13 Sep. 1984, 10 Sep. 1984, Institute of Electrical Engineers, pp. 21-26.
Patent Abstracts of Japan, Abstract of JP 1-208011, Aug. 22, 1989.
Schaum's Outline of Theory and Problems of Electric Circuits in Si Units, p. 94, paragraph 8.19, 1972, McGraw-Hill Book Company, N.Y. USA.
Grimm Siegfried H.
NEC Corporation
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