Oscillator circuit having optimized frequency modulation circuit

Details Oscillator circuit having optimized frequency modulation circuit Oscillator circuit having optimized frequency modulation circuit

1998-04-17

2000-04-04

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331117FE, 331177V, 332136, H03C 309, H03C 322, H03B 512

Patent

active

060466502

ABSTRACT:
A voltage controlled oscillator circuit (58) having a modulation input port (60) for receiving a modulation input signal through modulation circuit (62, 64, 66, 68) and a frequency resonator circuit (28, 74, 76, 80, 82, 84) operable coupled to the modulation input port (60) for providing a modulation dependent impedance. A semiconductor element (90) has three ports, a gate port (98), a source port (96) and a drain port (92), and the modulation circuit is operably coupled to the gate port (98) of the field effect transistor (90) via a first capacitance (70) and the source port (96) of the field effect transistor (90) via a second capacitance (71). This enables the modulation sensitivity to be substantially independent of temperature variations of circuit elements.

REFERENCES:
patent: 4510465 (1985-04-01), Rice et al.

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