Voltage-change control circuit and method

Details Voltage-change control circuit and method Voltage-change control circuit and method

2006-10-17

2006-10-17

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform amplitude control

C327S536000, C327S544000, C363S059000

Reexamination Certificate

active

07123067

ABSTRACT:
In a charge-pump booster circuit, the control clock is controlled on a small-step basis to thereby suppress the boost amplitude and the occurrence of various noises. Provided are a charge-pump booster circuit section for boosting an external power voltage in absolute value level, a boost-voltage feedback section for controlling the booster circuit section, and a clock buffer section. In the boost-voltage feedback section, an output level of the booster circuit section is detected by a voltage detecting section. This is compared with a reference level, and depending upon the comparison result, a count operation is made in an up/down counter section. Based on the count value, the control amount is shifted on a small-step basis from the D/A converter section, thereby controlling the power voltage of the clock buffer section300through the level shifter section.

REFERENCES:
patent: 6002599 (1999-12-01), Chow
patent: 6188590 (2001-02-01), Chang et al.
patent: 6278315 (2001-08-01), Kim
patent: 2001231249 (2001-08-01), None

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