Charge pump circuit and phase locked loop circuit using the char

Details Charge pump circuit and phase locked loop circuit using the char Charge pump circuit and phase locked loop circuit using the char

1996-01-23

1997-09-02

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 25, 327157, H03L 7085

Patent

active

056636865

ABSTRACT:
A charge pump with which a dynamic range of control voltage can be set broadly and a phase locked loop using the charge pump. The charge pump includes first, second and third transistors having respective first terminals for supplying constant currents to an output terminal. A second terminal of the first transistor is connected through a resistor to a power source. Second terminals of the second and third transistors are grounded through respective first and second T/M circuits (transmission gate analog switch circuits). A DOWN signal is applied to the first T/M circuit, and an inverted UP signal is applied to the second T/M circuit, in order to supply or draw out current via the output terminal.

REFERENCES:
patent: 4714900 (1987-12-01), Sata
patent: 5362990 (1994-11-01), Alvarez et al.
patent: 5497127 (1996-03-01), Sauer

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