System and method for charge-pump with phase-frequency...

Details System and method for charge-pump with phase-frequency... System and method for charge-pump with phase-frequency...

2006-06-15

2009-11-10

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S025000, C327S007000, C327S012000, C327S157000

Reexamination Certificate

active

07616065

ABSTRACT:
A method of generating a correction signal for a voltage controlled oscillator (VCO) includes receiving a first signal in a correction current generator, changing a state of a first error signal substantially simultaneously with a first changing state of the first signal, receiving a second signal in the correction current generator, changing a state of a second error signal substantially simultaneously with a first changing state of the second signal, changing the state of the first error signal substantially simultaneously with a second changing state of the second signal, changing the state of the second error signal substantially simultaneously with a second changing state of the first signal, combining the first error signal and the second error signal to generate the correction signal substantially equal to a difference between the first error signal and the second error signal and applying the correction signal to a loop filter coupled to a correction signal input of the VCO. A PLL circuit is also described.

REFERENCES:
patent: 4527277 (1985-07-01), Kosaka et al.
patent: 6218868 (2001-04-01), Katoh
patent: 7005896 (2006-02-01), Chen et al.
patent: 7057418 (2006-06-01), Fu et al.

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