Phase locked loop including active lowpass filter

Details Phase locked loop including active lowpass filter Phase locked loop including active lowpass filter

1977-11-25

1978-10-03

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, H03B 304

Patent

active

041186745

ABSTRACT:
The phase detector of this phase lock loop includes a transistor switch shaping the output of an Exclusive-OR gate which combines a data signal with a square wave local clock signal from a VCO for producing a digital error signal that is integrated to produce an error voltage that is applied to one side of a differential amplifier in an active lowpass filter. Other means integrates the local clock signal to produce a reference voltage that is applied to the other side of the amplifier, the output of the latter being a control voltage which drives the VCO. In a preferred embodiment, the reference voltage means and the path between the gate and the one side of the amplifier both include a switching transistor (the two being on a common substrate) and resistors of the same type and value for causing variations in the two input lines to the amplifier to track as a function of time and temperature.

REFERENCES:
patent: RE29431 (1977-10-01), Desai
patent: 3757244 (1973-09-01), Giger
patent: 3775695 (1973-11-01), Hill

Affiliated with

Also associated with

Rating

Phase locked loop including active lowpass filter 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 including active lowpass filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase locked loop including active lowpass filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1804052