H - Electricity – 03 – B
Patent
H - Electricity
03
B
331/64
H03B 5/12 (2006.01) H03L 1/02 (2006.01)
Patent
CA 1144610
INTEGRATED CIRCUIT FM LOCAL OSCILLATOR WITH AFC CONTROL AND TEMPERATURE COMPENSATION Abstract of the Disclosure A FM local oscillator circuit suitable for integrated circuit fabri- cation, the frequency of which responds to a first current component for re- ducing 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 con- trolled by said first current component for sustaining oscillations over said given frequency range and which further exhibit a variable capacitance con- trolled 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 ating said second current component.
350525
Gawler Glenn B.
Mcfadyen Robert J.
Company General Electric
Eckersley Raymond A.
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