Linearized fractional-N synthesizer having a gated offset

Details Linearized fractional-N synthesizer having a gated offset Linearized fractional-N synthesizer having a gated offset

2006-01-10

2006-01-10

Vo, Nguyen T. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S316000, C375S376000

Reexamination Certificate

active

06985708

ABSTRACT:
A linearized oscillation synthesizer includes a phase and frequency detection module, charge pump circuit, low pass filter, voltage control oscillator, and a feedback module. The phase and frequency detection module is operably coupled to produce a charge-up signal, a charge-down signal, and an off signal based on phase and/or frequency differences between a reference oscillation and a feedback oscillation. The reference oscillation is generated by a clock source such as a crystal oscillator while the divider module generates the feedback oscillation by dividing the output oscillation by a divider value. The charge pump circuit produces a positive current in response to the charge-up signal, a negative current in response to the charge-down signal and also produces a non-zero offset current. The non-zero offset current shifts the steady state operating condition, and other operating conditions, of the charge pump into a linear region of charge pump performance curve.

REFERENCES:
patent: 5631587 (1997-05-01), Co et al.
patent: 5783972 (1998-07-01), Nishikawa
patent: 6563387 (2003-05-01), Hirano et al.
patent: 2002/0097825 (2002-07-01), Kawahara
patent: 2003/0189463 (2003-10-01), Walker

Affiliated with

Also associated with

Rating

Linearized fractional-N synthesizer having a gated offset does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Linearized fractional-N synthesizer having a gated offset, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linearized fractional-N synthesizer having a gated offset will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3602764