Charge pumping circuit and PLL frequency synthesizer

Details Charge pumping circuit and PLL frequency synthesizer Charge pumping circuit and PLL frequency synthesizer

1998-08-20

2000-08-29

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 327157, H03L 7085, H03L 7089

Patent

active

061114693

ABSTRACT:
A charge pumping circuit includes a constant current source, a switch element, a first MOS transistor, a second MOS transistor, and a switching-off circuit. The constant current source generates and outputs a current having a constant current value. The switch element is turned on and outputs a current determined by the constant current source when an input signal is active. The first MOS transistor flows the current output from the switch element. The second MOS transistor constitutes a current mirror circuit together with the first MOS transistor, and outputs a current having a current value based on the current flowing through the first MOS transistor, as one of charge and discharge currents. The switching-off circuit turns off the second MOS transistor by charging or discharging the gate when the input signal is inactive.

REFERENCES:
patent: 4792705 (1988-12-01), Ouyang et al.
patent: 6043716 (2000-03-01), Warner

Affiliated with

Also associated with

Rating

Charge pumping circuit and PLL frequency synthesizer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Charge pumping circuit and PLL frequency synthesizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Charge pumping circuit and PLL frequency synthesizer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1253914