Gain maintenance apparatus for use with a high gain amplifier in

Details Gain maintenance apparatus for use with a high gain amplifier in Gain maintenance apparatus for use with a high gain amplifier in

1987-06-05

1988-11-29

Wan, Gene

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 17, 331 25, H03L 716

Patent

active

047885122

ABSTRACT:
When there is a loss of tracking in a signal tracking system, such as a phase-lock loop, some components of the system, such as high gain amplifiers, will tend to have their outputs driven to the rail. When the output of an amplifier used to drive a voltage controlled oscillator in a phase-lock loop is driven to the rail, not only is its gain reduced to a very low value but additionally this rail voltage will interfere with the signal reacquisition process of the system. The present invention detects when system conditions are such that the amplifier could change to a low gain condition, and provides feedback around the high gain amplifier during those conditions to keep its output substantially centered until the system reestablishes a tracking mode.

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