Modulation control circuit for an amplitude modulator

Details Modulation control circuit for an amplitude modulator Modulation control circuit for an amplitude modulator

1986-01-30

1987-03-31

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 38, 332 40, 332 41, 332 48, 358 23, 360 29, 455108, H03C 142

Patent

active

046546073

ABSTRACT:
An amplitude modulator having first and second differential amplifiers which are commonly supplied with an amplitude modulated carrier signal and a third differential amplifier which is connected to the emitter current path of the first differential amplifier, wherein the third differential amplifier is supplied with a video signal for modulation through a limiter and a current value of a current source connected to the third differential amplifier is adjusted to thereby adjust a modulation degree of an amplitude modulated video signal derived from the first and second differential amplifiers so that a white level of an input video signal can be positively prevented from being deteriorated.

REFERENCES:
patent: 4338580 (1982-07-01), Gay
patent: 4547752 (1985-10-01), Shinbara

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