Negative feedback control loop acquisition aid

Details Negative feedback control loop acquisition aid Negative feedback control loop acquisition aid

1991-11-04

1992-09-15

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 17, 331DIG2, 375120, H03L 712

Patent

active

051481235

ABSTRACT:
A bandpass filter is used, which closely matches the characteristics of a closed phase lock loop (PLL) so as to provide an acquisition detector output in a PLL being swept. This detector is not activated by noise generated in the loop due to data or other perturbations. This filter includes a differentiator to exacerbate the filtered output and thus, more clearly define the condition being detected. The phase lock acquisition sweep is disabled when the detector output exceeds a predetermined absolute value. The detection scheme works equally well in approaching the lock frequency from above or below actual lock and a latch circuit ensures that the sweep approach always alternates to compensate for an erratic phase detector in the PLL.

REFERENCES:
patent: 4083015 (1978-04-01), Popodi
patent: 4320530 (1982-03-01), Ikeda

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