Oscillators – Automatic frequency stabilization using a phase or frequency... – Search sweep of oscillator
Patent
1988-07-22
1989-09-26
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Search sweep of oscillator
331DIG2, 329305, 375 81, 375 83, 375120, H03L 712, H04L 2722
Patent
active
048703826
ABSTRACT:
The present invention provides a high frequency lock detecting circuit for generating a signal indicative of a locked or a not locked phase tracking condition in a phase locked loop circuit. The lock detector comprises a plurality of high speed function generators two of which are coupled to the modulated data streams for indicating the phase data streams and a third high speed function generator is coupled to the voltage error signal of the phase locked loop for indicating the absence or presence of a voltage error signal. The analog outputs of the function generators are summed together in a summing circuit and applied to a differential amplifier which removes the complex modulated data products from the output of the function generators and provides a signal which is equal to the absolute value of the data signals applied to the first function generators minus the absolute value of the error signal applied by the third function generator. The lock detection signal is applied to the sweep controls of the phase locked loop for controlling the sweep circuits associated with the voltage controlled oscillator.
REFERENCES:
patent: 4092606 (1978-05-01), Ryan
Arbanas Glenn A.
Keate Christopher R.
Bramson Robert S.
Grimm Siegfried H.
Sowell John B.
Starr Mark T.
Unisys Corporation
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