Charge pump-based PLL having dynamic loop gain

Details Charge pump-based PLL having dynamic loop gain Charge pump-based PLL having dynamic loop gain

2006-12-12

2006-12-12

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S00100A, C331S017000, C327S156000, C327S157000

Reexamination Certificate

active

07148757

ABSTRACT:
A charge pump-based PLL dynamically controls loop gain in response to the frequency of an input signal. The loop gain is dynamically adjusted by varying the bias current of the charge pump circuit of the PLL. The bias current is varied in response to the voltage of a loop filter that is coupled to the output of the charge pump circuit. A voltage-to-current converter (“V/I converter”) converts the voltage of the loop filter to a current. The current is mirrored to a dynamic bias generator. The dynamic bias generator comprises a sample-and-hold circuit that is used to sample the mirrored current when the charge pump circuit is temporarily switched off. The sampled current level is used to adjust the level of the bias current of the charge pump circuit. The switching the charge pump off minimizes the disturbance of the loop filter voltage by the charge pump.

REFERENCES:
patent: 5668503 (1997-09-01), Gersbach et al.

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