Phase locked loop with automatic sweep

Details Phase locked loop with automatic sweep Phase locked loop with automatic sweep

1978-11-13

1980-06-03

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 17, 331 25, H03B 304

Patent

active

042064201

ABSTRACT:
An improved phase-locked loop includes a phase detector, active loop filter and a VCO, in conventional phase-locked loop relationship. In addition, a positive feedback path couples active loop filter output to active loop filter input. In the absence of loop lock, the positive feedback provided by the positive feedback path satisfies the conditions necessary for the production of an oscillating output from the active loop filter circuit. The oscillating output generated by this "oscillator" drives the VCO in a sweeping action allowing the loop to acquire signals outside of its normal capture range. On capture, phase detector output provides an additional negative feedback path which overrides the effect of the positive feedback path and therefore, oscillations cease and the loop locks. The positive feedback path can comprise a relatively simple passive frequency selective circuit.

REFERENCES:
patent: 3935541 (1976-01-01), Amend et al.
patent: 4039966 (1977-08-01), Skinner

Affiliated with

Also associated with

Rating

Phase locked loop with automatic sweep does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Phase locked loop with automatic sweep, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase locked loop with automatic sweep will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-717616