Output circuit and current source circuit used in the same

Details Output circuit and current source circuit used in the same Output circuit and current source circuit used in the same

2006-10-26

2009-06-23

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S103000, C327S538000

Reexamination Certificate

active

07551005

ABSTRACT:
An output circuit includes a constant current circuit that generates and supplies a constant current to an output terminal of the output circuit. Based on the constant current, the output circuit converts an input signal to an output signal having a voltage within a voltage range specified by upper and lower clamp voltages. The output signal is feedback to the constant current circuit. The constant current circuit changes the amount of the constant current in accordance with the output signal in such a manner that the constant current increases with an increase in the output signal and becomes zero when the output signal decreases to or below a threshold voltage. Thus, the upper clamp voltage is made as close to a power supply voltage as possible and the lower clamp voltage is made as close to a ground voltage as possible.

REFERENCES:
patent: 4077012 (1978-02-01), Iwamatsu
patent: 5914635 (1999-06-01), Yamamoto
patent: 2005/0093616 (2005-05-01), Chen

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