Voltage controlled oscillator having frequency and amplitude con

Details Voltage controlled oscillator having frequency and amplitude con Voltage controlled oscillator having frequency and amplitude con

1995-06-20

1996-12-03

Grimm, Siegfried H.

Oscillators

Polyphase output

331108B, 331109, 331135, 331177R, 331183, H03B 524

Patent

active

055812155

ABSTRACT:
A voltage controlled oscillator that completely eliminates the need for any externally mounted coil and capacitor includes a first loop and a second loop. The first loop provides band-limiting of an output signal of an amplifier through a bandpass filter to provide oscillation at a frequency of a resonant point of the bandpass filter, and the second loop controls the oscillation amplitude, so that a lowpass filter output with a 90.degree. phase is extracted from the first loop, while a bandpass filter output with a 0.degree. phase is extracted from the second loop. The voltage controlled oscillator may be used in an automatic fine tuning circuit for television.

REFERENCES:
patent: 4994763 (1991-02-01), Chen et al.
patent: 5459438 (1995-10-01), Mirow

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