Suppressed carrier modulator using differential amplifier

Details Suppressed carrier modulator using differential amplifier Suppressed carrier modulator using differential amplifier

1979-09-18

1981-07-14

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 31T, 332 41, 332 44, H03C 142, H03C 154

Patent

active

042789540

ABSTRACT:
The modulation system comprises emitter coupled first to fourth transistor pairs of one type, emitter coupled fifth and sixth transistor pairs of the other type, and a differential amplifier. The first and second transistor pairs are connected to the fifth transistor pair by emitter follower connections and the third and fourth transistor pairs are also connected to the sixth transistor pairs through emitter follower connections. The outputs of the fifth and sixth transistor pairs are coupled to paired input terminals of the differential amplifier. A modulation signal is applied to the transistors of the first and fourth transistor pairs. A signal to be modulated is supplied to the transistors of the first and third transistor pairs and DC voltage is supplied to the base electrodes of the transistors of the second and third transistor pairs. Further, a signal to be modulated and having an opposite phase to the first mentioned signal to be modulated is applied to transistors of the second and fourth transistor pairs, thus producing a suppressed carrier modulated output signal from the differential amplifier.

REFERENCES:
patent: 3229230 (1966-01-01), Feldman
patent: 3550040 (1970-12-01), Sinusas
patent: 4142162 (1979-02-01), Huntley

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