PLL circuit and frequency setting circuit using the same

Details PLL circuit and frequency setting circuit using the same PLL circuit and frequency setting circuit using the same

2005-05-11

2008-10-28

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S147000

Reexamination Certificate

active

07443214

ABSTRACT:
Disclosed is a PLL circuit in which an AC signal with a predetermined frequency is supplied as an input signal to a phase shifter comprising an OTA and a capacitor, and a phase comparator that receives the input signal to the phase shifter and an output signal from the phase shifter outputs a signal corresponding to a phase difference between the input signals. Control is performed so that the phase difference given by the phase shifter becomes a constant value by changing a transconductance (gm) of at the OTA constituting the phase shifter, using an output voltage of an amplifier for amplifying a DC voltage of the output signal of the phase comparator as a control signal.

REFERENCES:
patent: 4628272 (1986-12-01), Davis et al.
patent: 5325317 (1994-06-01), Petersen et al.
patent: 5334945 (1994-08-01), Yokoya et al.
patent: 5594383 (1997-01-01), Tamba
patent: 5606284 (1997-02-01), Tamesue et al.
patent: 6114902 (2000-09-01), Beatson et al.
patent: 6172569 (2001-01-01), McCall et al.
patent: 6323692 (2001-11-01), Tsinker
patent: 6549074 (2003-04-01), Ugajin et al.
patent: 6842710 (2005-01-01), Gehring et al.
patent: 6977542 (2005-12-01), Ganeshan et al.
patent: 7019567 (2006-03-01), Katakura
patent: 7051063 (2006-05-01), Kaczynski et al.
patent: 2002/0113725 (2002-08-01), Katoh
patent: 1 187 326 (2002-03-01), None
patent: 2 249 915 (1992-05-01), None
patent: 2 296 835 (1996-07-01), None
patent: 2 323 985 (1998-10-01), None
patent: 2973491 (1999-09-01), None
patent: 2000-209066 (2000-07-01), None
Venugopal Gopinathan, et al., “Design Considerations for High-Frequency Continuous-Time Filters and Implementation of an Antialiasing Filter for Digital Video”, IEEE Journal of Solid-State Circuits, vol. 25, No. 6, Dec. 1990, pp. 1368-1378.
European Search Report dated Oct. 11, 2005.

Affiliated with

Also associated with

Rating

PLL circuit and frequency setting circuit using the same 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 frequency setting circuit using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PLL circuit and frequency setting circuit using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3994002