Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1978-08-08
1980-02-12
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
324118, 324119, 329205R, 329206, 330 10, 363 45, G01R 1918, H02M 706, H03D 110
Patent
active
041885864
ABSTRACT:
In a demodulator circuit for a chopper amplifier including a rectifier and a smoothing filter having a capacitor, an impedance conversion circuit is connected to the output side terminal of the capacitor to ensure holding of the stored charges of the capacitor at each negative half-cycle of the amplitude-modulated AC signal applied to the demodulator circuit. A discharge circuit including a switching element is further provided for the capacitor and the discharge circuit is rendered conductive at each positive half-cycle of the amplitude-modulated AC signal which is also applied to a control terminal of the switching element.
REFERENCES:
patent: 3721891 (1973-03-01), Moses
patent: 3787755 (1974-01-01), Goldner
patent: 4067233 (1978-01-01), Obayashi et al.
Grimm Siegfried H.
Nippon Soken Inc.
Westin Edward P.
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