Integrated circuit FM local oscillator with AFC control and temp

Details Integrated circuit FM local oscillator with AFC control and temp Integrated circuit FM local oscillator with AFC control and temp

1979-04-26

1981-05-26

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331117R, 331176, 331177R, H03B 512

Patent

active

042701023

ABSTRACT:
A FM local oscillator circuit suitable for integrated circuit fabrication, the frequency of which responds to a first current component for reducing frequency drift of a tuned frequency as a function of temperature and to a second current component for providing automatic frequency control of said tuned frequency. The circuit comprises a cross coupled differential pair of transistors, adapted to be coupled to a tuned circuit manually tunable over a given frequency range, which exhibit a negative conductance substantially controlled by said first current component for sustaining oscillations over said given frequency range and which further exhibit a variable capacitance controlled by said second current component for providing electronic fine tuning of the oscillator circuit. The emitters of the differential transistor pair are joined and coupled to first and second current sources, the first of which is temperature compensated for generating said first current component and the second of which is selectively controlled by an AFC control signal for generating said second current component.

REFERENCES:
patent: 3963996 (1976-06-01), Skerlos
patent: 4063193 (1977-12-01), Wilcox

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