Oscillator having switching capacitors and phase-locked loop emp

Details Oscillator having switching capacitors and phase-locked loop emp Oscillator having switching capacitors and phase-locked loop emp

1997-01-06

1998-08-11

Nelms, David C.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 331366, 331108R, H03L 700

Patent

active

057932573

ABSTRACT:
A voltage-controlled oscillator has first and second switched capacitor filters, an operational amplifier, and a comparator. The first switched capacitor filter is controlled by a control clock signal to supply a positive current depending on an input voltage, and the second switched capacitor filter is controlled by the control clock signal to supply a negative current depending on the input voltage. The operational amplifier has an input terminal alternately connectable to the first and second switched capacitor filters by a first switch which can be rendered conductive in synchronism with an output clock signal, and another input terminal for being supplied with a constant voltage. A potential at an output terminal of the operational amplifier is lowered when the operational amplifier is supplied with the positive current through a feedback circuit which is provided between the input terminal and the output terminal, and is increased when the operational amplifier is supplied with the negative current through the feedback circuit. The comparator compares the potential at the output terminal of the operational amplifier alternately with a first constant voltage and a second constant voltage, lower than the first constant voltage, which can be switched in synchronism with the output clock signal, thereby to produce the output clock signal.

REFERENCES:
patent: 4987373 (1991-01-01), Soo
patent: 5663675 (1997-09-01), O'Shaughnessy

Affiliated with

Also associated with

Rating

Oscillator having switching capacitors and phase-locked loop emp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Oscillator having switching capacitors and phase-locked loop emp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oscillator having switching capacitors and phase-locked loop emp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-392827