Phase locked loop charge pump circuit

Details Phase locked loop charge pump circuit Phase locked loop charge pump circuit

1997-11-07

2000-08-22

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 16, 327156, 327157, 327536, 327537, 375374, H03L 708

Patent

active

061078891

ABSTRACT:
A charge pump circuit including current source circuits for maintaining the current sourced from an upper current source substantially equal to the current sunk by a lower current source. The current source circuits include a lower reference current source operable for defining a reference current through a first biasing transistor and a duplicate device in which an output current can be established proportional to the reference current therethrough. A complementary output device is provided for producing the upper current source along with a duplicate biasing device. The duplicate complementary biasing devices are such that the current through these devices is identical and equal to the reference current. A replication feedback loop coupled to both the common connected node of the complementary output devices and the common connected node of the complementary biasing devices operates to make the voltage at these two nodes substantially identical. In this way, the current in the output devices is substantially equal in amplitude independent of the output voltage.

REFERENCES:
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patent: 5184028 (1993-02-01), Zobel
patent: 5416691 (1995-05-01), Croughwell
patent: 5420545 (1995-05-01), Davis et al.
patent: 5473283 (1995-12-01), Luich
patent: 5508660 (1996-04-01), Gersbach et al.
patent: 5576647 (1996-11-01), Sutardja et al.

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