Charge pump current compensation for phase-locked loop...

Details Charge pump current compensation for phase-locked loop... Charge pump current compensation for phase-locked loop...

2011-08-30

2011-08-30

Tran, Tuan A (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S254000, C455S255000, C455S258000, C455S259000, C455S180300, C455S182100, C455S183100, C331S018000, C331S025000, C331S034000

Reexamination Certificate

active

08010072

ABSTRACT:
A technique for improving frequency synthesizer performance by frequency-compensating charge pump current in order to maintain a consistent loop bandwidth over a wide operating frequency range is described. A relationship between the capacitance value associated with a voltage controlled oscillator resonant tank and the magnitude of current pulses in a related charge pump is exploited to bound the loop bandwidth of the frequency synthesizer over both operating frequency and process variation. A control state machine generates digital coarse tune values that dynamically select a capacitance for the resonant tank, such that the voltage controlled oscillator operates within an optimal control voltage range. Each dynamically selected capacitance value is then used to determine the magnitude of current pulses in the charge pump.

REFERENCES:
patent: 6642799 (2003-11-01), Tang
patent: 6774732 (2004-08-01), Harnishfeger et al.
patent: 7177611 (2007-02-01), Goldman
patent: 7323944 (2008-01-01), Florescu et al.
patent: 7375595 (2008-05-01), Serrano et al.

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