Charge pump with charge/discharge amount control

Details Charge pump with charge/discharge amount control Charge pump with charge/discharge amount control

1998-06-25

2000-08-29

Lee, Benny

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 327148, H03L 700

Patent

active

061114685

ABSTRACT:
A charge pump circuit which may be used in a PLL includes a charge/discharge circuit, a detection circuit and an adjusting circuit. The charge/discharge circuit performs a charge operation in response to a first pulse signal and a discharge operation in response to a second pulse signal and outputs an output signal having a voltage based on the charge and the discharge operations. The detection circuit detects whether a charge operation or a discharge operation was performed and generates a control signal. The adjusting circuit adjusts the charge and discharge operations so that a charge amount and a discharge amount per unit time become substantially equal to each other.

REFERENCES:
patent: 5075640 (1991-12-01), Miyazawa
patent: 5357216 (1994-10-01), Nguyen
patent: 5508660 (1996-04-01), Gersbach et al.
patent: 5592120 (1997-01-01), Palmer et al.
patent: 5722052 (1998-02-01), Abdi et al.

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