PLL circuit and recording or reproducing apparatus utilizing the

Details PLL circuit and recording or reproducing apparatus utilizing the PLL circuit and recording or reproducing apparatus utilizing the

1998-09-29

2000-06-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327159, 331 17, 331 25, 331DIG2, H03L 706

Patent

active

060753943

ABSTRACT:
In a PLL circuit, the phase of the frequency of an input signal is compared with that of an oscillation frequency generated from a voltage-controlled oscillator. Charge pump circuits are provided which outputs currents pulse-width modulated based on information about the error between the two phases, respectively. An output voltage of a capacitor provided at a stage subsequent to one of the charge pump circuits is converted into a current by a gm amplifier. Further, the converted current is added to an output current of the other charge pump circuit. The so-added output is used as a control input for the voltage-controlled oscillator. The oscillation frequency of the voltage-controlled oscillator is produced as an output signal frequency.

REFERENCES:
patent: 4023116 (1977-05-01), Alfke et al.
patent: 4316223 (1982-02-01), Baldwin et al.
patent: 5274681 (1993-12-01), Yamada et al.
patent: 5317423 (1994-05-01), Harada
patent: 5384502 (1995-01-01), Volk
patent: 5384774 (1995-01-01), Martin et al.
patent: 5491439 (1996-02-01), Kelkar et al.
patent: 5619161 (1997-04-01), Novof et al.
patent: 5670913 (1997-09-01), Palancar
patent: 5696468 (1997-12-01), Nise
patent: 5740213 (1998-04-01), Dreyer

Affiliated with

Also associated with

Rating

PLL circuit and recording or reproducing apparatus utilizing the does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with PLL circuit and recording or reproducing apparatus utilizing the, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PLL circuit and recording or reproducing apparatus utilizing the will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2071544