Linearized fractional-N synthesizer with fixed charge pump...

Details Linearized fractional-N synthesizer with fixed charge pump... Linearized fractional-N synthesizer with fixed charge pump...

2006-07-25

2006-07-25

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S375000, C375S376000, C327S157000

Reexamination Certificate

active

07082176

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.

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Riley et al.,Delta-Sigma Modulation in Fractional-N Frequency Synthesis, IEEE Journal of Solid-State Circuits, vol. 28, No. 5, May 1993; pp. 553-559.

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