Circuit for preventing VCXO mode jumping

Details Circuit for preventing VCXO mode jumping Circuit for preventing VCXO mode jumping

1990-04-10

1991-10-01

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

331105, 331158, H03B 532, H03L 7099

Patent

active

050537261

ABSTRACT:
An oscillator includes a mechanical resonator, such as a crystal, and having an amplifier arranged for oscillating at a first frequency. A resonant circuit is coupled in series with the crystal. The resonant circuit is antiresonant at an undesired harmonic frequency of the crystal thus prohibiting oscillation of the oscillator at said undesired harmonic frequency. The present oscillator is a portion of a phase locked loop used in a television receiver for demodulating a composite stereophonic audio signal.

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