Voltage regulator for integrated circuits

Details Voltage regulator for integrated circuits Voltage regulator for integrated circuits

2007-08-31

2009-10-13

Nguyen, Matthew V (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S282000

Reexamination Certificate

active

07602168

ABSTRACT:
A voltage regulator for a charge pump includes a capacitor divider and a reset circuit. The capacitor divider produces, based on an input voltage (VPP), a sample voltage at a sampling node. The sampling node and a reference voltage VREF are connected to respective inputs of a comparator that generates an enable signal for the charge pump. The reset circuit connects to the divider and includes a first transistor connected between the sampling node and a biasing node. During a sampling mode, the reset circuit biases VDS of the first transistor to approximately zero at the regulation point to minimize sub-threshold IDS. During reset intervals, the reset circuit applies VREF to the biasing node. The reset circuit may include a second transistor connected between the biasing node and a known level (e.g., ground) and a biasing transistor connected between the biasing node and VREF.

REFERENCES:
patent: 5812017 (1998-09-01), Golla et al.
patent: 5946258 (1999-08-01), Evertt et al.
patent: 6456153 (2002-09-01), Buck et al.
patent: 6515903 (2003-02-01), Le et al.
patent: 6628151 (2003-09-01), Zhou et al.
patent: 7279959 (2007-10-01), Choy

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