Variable-output current-load-independent negative-voltage...

Details Variable-output current-load-independent negative-voltage... Variable-output current-load-independent negative-voltage...

2011-01-04

2011-01-04

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S537000

Reexamination Certificate

active

07863968

ABSTRACT:
Methods and circuits for implementing negative voltage regulators are provided. The negative voltage regulator circuit includes an operational amplifier (op-amp), a PMOS transistor, and two resistors. The op-amp is powered by positive and negative voltages, and the PMOS transistor has a gate in electrical communication with the op-amp. A first resistor is disposed between a positive reference voltage and a tap point, while the second resistor is disposed between the tap point and the output of the negative voltage regulator circuit. The use of the PMOS transistor facilitates a common drain output stage making the loop gain load independent, resulting in a stable system independent of current load.

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patent: 2007/0216379 (2007-09-01), Kitagawa
patent: 2008/0303498 (2008-12-01), Huang

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