Frequency synthesizer with improved spurious performance

Details Frequency synthesizer with improved spurious performance Frequency synthesizer with improved spurious performance

2008-07-29

2008-07-29

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S179000, C331S034000

Reexamination Certificate

active

07405630

ABSTRACT:
A loop filter for use in a frequency synthesizer provides improved spurious performance using switched capacitors. The loop filter includes a first switched capacitor having a first capacitance value and which is operable to charge to a first voltage corresponding to a current pulse indicative of a difference in phase or frequency between a reference signal and a feedback signal. The loop filter further includes a second switched capacitor having a second capacitance value and which is operable to charge to a second voltage from the first voltage and produce a control voltage based upon the second voltage. The loop filter has a bandwidth determined by a ratio of the second capacitance value to the first capacitance value.

REFERENCES:
patent: 7145400 (2006-12-01), Horan

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