Dual port voltage controlled emitter coupled multivibrator

Details Dual port voltage controlled emitter coupled multivibrator Dual port voltage controlled emitter coupled multivibrator

1989-02-15

1989-11-28

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331177R, 331176, H03K 3282

Patent

active

048840424

ABSTRACT:
A voltage controlled oscillator includes an emitter coupled multivibrator in which a capacitor determines the frequency of oscillation along with a pair of load resistors and a pair of current sources. A differential amplifier is coupled to operate in parallel with the mutlivibrator and its tail current is operated differentially, with respect to the currents in the pair of sources, in response to the input voltage at a first modulation input port. Thus, a constant current flows in the multivibrator loads even when the frequency is modulated. A second input port is coupled to vary the tail current in the differential amplifier to comprise a dual port control of the voltage controlled oscillator. The circuit can be operated at a relatively low supply voltage and can be temperature compensated. Furthermore, the input ports can include circuitry having a logarithmic response for digital signaling processing.

REFERENCES:
patent: 3857110 (1974-12-01), Grebene
patent: 4001603 (1977-01-01), Wilcox
patent: 4468636 (1984-08-01), Monticelli
patent: 4692718 (1987-09-01), Roza et al.

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