Variable reactance circuit including differentially-connected tr

Details Variable reactance circuit including differentially-connected tr Variable reactance circuit including differentially-connected tr

1975-06-24

1976-10-12

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331116R, 331177R, 332 26, 332 30R, 333 80T, H03B 536, H03C 314, H03H 1100

Patent

active

039861457

ABSTRACT:
A variable reactance circuit is composed of a differential amplifier having first and second emitter-coupled transistors, a reactance element, such as a capacitor, connected between the collector and base electrodes of the first transistor, and a control signal source connected to the emitter electrodes of the transistors by which the input impedance of the first transistor is effective as a variable reactance which is changed in accordance with the level of the control signal. Such variable reactance circuit may be used with an oscillator or resonance circuit to constitute a frequency modulator controlled by the control signal source.

REFERENCES:
patent: 3717826 (1973-02-01), Legler

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