Feedback circuit for cmos high voltage generator to program...

H - Electricity – 02 – M

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H02M 3/07 (2006.01) G11C 16/06 (2006.01) G11C 16/30 (2006.01)

Patent

CA 2127803

2127803 9314555 PCTABS00024 Feedback circuit for a high voltage generator comprising several voltage multiplying stages connected in series, wherein an oscillator generates at least two clock pulses being 180· out of phase to one another, controlling alternately successive voltage multiplying stages to provide a high voltage pulse at the output of the high voltage generator, the high voltage output being connected to the feedback circuit generating a control signal supplied to the oscillator, so that the two clock pulses are modified in dependence on the high voltage output voltage, wherein the feedback circuit comprises a high voltage feedback circuit provided with a capacitive input stage (CP, CR), the output signal (VCTRLHV) of the high voltage feedback circuit controlling the current of a controlled current source, and at least the oscillator generating the clock pulses receives said current as control signal and in dependence thereon controls the frequency of the clock pulses.

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