Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1978-01-03
1979-02-27
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
325138, 332 37D, 332 44, H03C 154
Patent
active
041421620
ABSTRACT:
A double sideband suppressed carrier (DSBSC) modulator for operation from unbalanced carrier frequency and modulation frequency sources has the input terminals of first and second constant current amplifiers connected to receive the modulation frequency output signal from the unbalanced source. The first and second constant current amplifiers provide in-phase and out-of-phase modulation frequency signals at respective high impedance output terminals for connection to a modulator. The modulator comprises a quad, i.e., four transistors connected to provide a pair of differential amplifiers. Transistors 1 and 2 comprising the first of the pair and transistors 3 and 4 comprising the second of the differential pair. The emitters of each differential amplifier are tied together. The emitter junction of the first differential amplifier is connected to the high impedance output of the first constant current amplifier, and the emitter junction of the second differential amplifier is connected to the high impedance output of the second constant current amplifier. The base of transistors 2 and 3 are connected together and then connected to one terminal of the carrier frequency source. The bases of transistors 1 and 4 are connected together and then connected to the other terminal of the carrier frequency source. The collectors of transistors 1 and 3 are tied together and the collectors of transistors 2 and 4 are tied together to provide the modulated signal output paths.
REFERENCES:
patent: 3550040 (1970-12-01), Sinusas
Cool Leonard R.
Grimm Siegfried H.
GTE Automatic Electric Laboratories Inc.
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