Frequency synthesizer and charge pump circuit used for the same

Details Frequency synthesizer and charge pump circuit used for the same Frequency synthesizer and charge pump circuit used for the same

2007-08-06

2009-08-18

Payne, David C (Department: 2611)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C375S376000

Reexamination Certificate

active

07576578

ABSTRACT:
A frequency synthesizer includes an AND circuit (17) for detecting whether a frequency synthesizer is in a lock state according to a signal outputted from an Up terminal and a Down terminal of a phase comparator and switching circuits (18, 19) for switching between presence and absence of connections of constant current circuits (14, 15) constituting a charge pump circuit (4) according to the output signal of the AND circuit (17). When the AND circuit (17) has detected a high impedance state of the charge pump circuit (4), the switching circuits (18, 19) disconnects the constant current circuits (14, 15) by the switching circuits (18, 19). Thus, it is possible to eliminate current flowing into the charge pump circuit (4) without using a control signal from outside such as a power cut signal and an intermittent signal.

REFERENCES:
patent: 6664829 (2003-12-01), Hughes
patent: 2005/0229066 (2005-10-01), Wolff et al.
patent: 2006/0045222 (2006-03-01), Kim et al.
patent: 07-030416 (1995-01-01), None
patent: 11-214989 (1999-08-01), None
patent: 2001-177399 (2001-06-01), None

Affiliated with

Also associated with

Rating

Frequency synthesizer and charge pump circuit used for 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 Frequency synthesizer and charge pump circuit used for the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency synthesizer and charge pump circuit used for the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4068500