PLL Phase error alarm related to associated receiver

Details PLL Phase error alarm related to associated receiver PLL Phase error alarm related to associated receiver

1982-07-19

1985-02-12

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 331 64, 331DIG2, 455 9, 455260, H03L 708, H03B 100

Patent

active

044994346

ABSTRACT:
An alarm circuit operatively associated with a phase-locked loop provides an error indication when the phases of the referenced signal and voltage controlled oscillator signal lose synchronization for times less than one millisecond. The alarm circuit includes an amplifier connected to receive the phase detector error signal, and an impedance connected to conduct the phase detector error signal to the amplifier. The impedance and amplifier have a frequency response corresponding to a frequency response of an associated receiver circuit, so that short duration deviations in the reference signal frequency which the receiver circuit cannot track produce an error indication and long duration deviations which can be tracked by the receiver circuit do not produce an error indication.

REFERENCES:
patent: 4317223 (1982-02-01), Farmer, Jr.

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