High frequency modulator, such as an amplitude modulator, includ

Details High frequency modulator, such as an amplitude modulator, includ High frequency modulator, such as an amplitude modulator, includ

1975-05-12

1976-08-10

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325139, 325153, 325182, 331 76, 331116R, 332 37R, 332 38, 332 40, 332 43B, H03C 106, H03C 136

Patent

active

039744604

ABSTRACT:
A high-frequency modulator circuit including a frequency multiplier comprised of a first differential amplifier for receiving a base oscillating signal and for multiplying the frequency of the base oscillating signal to thereby produce a higher frequency carrier signal; and a modulating circuit connected to the first differential amplifier for modulating the carrier signal with input information. The first differential amplifier includes a pair of output terminals; and the modulating circuit is comprised of a second and third differential amplifier, each having a pair of input terminals connected to the respective output terminals of the first differential amplifier such that the higher frequency carrier signal is applied differentially to each of the second and third differential amplifiers. The second and third differential amplifiers each includes a pair of output terminals, the second differential amplifier output terminals being connected to oppositely phased ones of the third differential amplifier output terminal. The input information is supplied to at least one of the second and third differential amplifiers to thereby vary the higher frequency carrier currents which flow therethrough.

REFERENCES:
patent: 3866148 (1975-02-01), Lisle, Jr. et al.
patent: 3887886 (1975-06-01), Okada et al.

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