Current switch and PLL in which it is used

Details Current switch and PLL in which it is used Current switch and PLL in which it is used

1998-02-17

2000-05-16

Ton, My-Trang Nu

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

H03L 706

Patent

active

060642432

ABSTRACT:
The present invention is a current switch, which supplies a constant current to a load circuit, and comprises: a transistor, the gate of which is supplied with a predetermined constant voltage, and the drain of which is connected to the above-mentioned load circuit; and a constant voltage supply circuit, which, in response to a control signal, supplies to the source of the above-mentioned transistor a first constant voltage, or a second constant voltage that differs from the first constant voltage, wherein when the above-mentioned first constant voltage is supplied to the above-mentioned transistor source by the above-mentioned constant voltage supply circuit, the transistor is turned ON and supplies the above-mentioned constant current to the above-mentioned load circuit, and when the above-mentioned secondary constant voltage is supplied to the above-mentioned transistor source, the transistor is turned OFF and interrupts the above-mentioned constant current. With a current switch configured as described above, high-precision current can be supplied and interrupted at the start and interruption of the current supply.

REFERENCES:
patent: 5103191 (1992-04-01), Werker
patent: 5473283 (1995-12-01), Luich
patent: 5508702 (1996-04-01), Estrada et al.
patent: 5576647 (1996-11-01), Sutardja et al.
patent: 5734279 (1998-03-01), Bereza
patent: 5801578 (1998-09-01), Bereza
patent: 5886551 (1999-03-01), Narahara
patent: 5898336 (1999-04-01), Yamaguchi
patent: 5912575 (1999-06-01), Takikawa

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