Integrable variable-frequency oscillator circuit

Details Integrable variable-frequency oscillator circuit Integrable variable-frequency oscillator circuit

1990-11-13

1992-05-19

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331108C, 331177R, H03B 512

Patent

active

051152126

ABSTRACT:
An integrable variable-frequency oscillator circuit with a feedback amplifier configuration includes first and second input terminals. A frequency-determining feedback element is connected between the input terminals. First and second amplifier stages have inputs connected to the first input terminal and outputs supplying output signals generated by the amplifier stages. The second amplifier stage has a variable gain. A first phase-shifting component is connected to the output of the second amplifier stage for receiving the output signal of the second amplifier stage. A third amplifier stage is connected downstream of the first phase-shifting component for generating an output signal. The output of the first amplifier stage is connected downstream of the phase-shifting component for adding the output signal of the first amplifier stage to the output signal of the second amplifier stage. A second phase-shifting component is connected between the third amplifier stage and the second input terminal for supplying the output signal of the third amplifier stage to the second input terminal.

REFERENCES:
patent: 3815052 (1974-06-01), Watatani et al.
patent: 4595887 (1986-06-01), Miura
patent: 4761616 (1988-08-01), Ash
patent: 4843348 (1989-06-01), Fenk
Publication: Semiconductors, Motorola, Inc., 1981, "FM Modulator Circuit".

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