Patent ID: 7706160
Filing Date: 2010-04-27
Classification: G11C,H02M

Abstract:
1. A DAC-controlled high voltage generator, comprising: an input terminal connected to a first voltage reference; an output terminal providing an output voltage; a voltage control circuit and a charge pump circuit connected, in series to each other, between the input and output terminals of the high voltage generator; an output regulator connected to the output terminal of the high voltage generator and including: a first resistive element; a digital-to-analog converter (DAC); a current regulation portion connected to the output terminal of the high voltage generator through the first resistive element as well to an enabling terminal which provides an enabling signal, the current regulation portion being supplied by a second voltage reference having a voltage level higher than a voltage level of the first voltage reference; an input terminal connected to the output terminal of the high voltage generator; an output terminal connected to the voltage control circuit; an operational amplifier having a first input terminal connected to the input terminal of the high voltage generator, a second input terminal connected to a first internal node and an output terminal; a measuring transistor connected between the first internal node and the output terminal of the measuring circuit and having a control terminal connected to the output terminal of the operational amplifier; the first resistive element, which is connected between the input terminal of the measuring circuit and the first internal node; a current/voltage converter connected between the output terminal of the measuring circuit and the third voltage reference and providing a measured voltage to the output terminal of the measuring circuit; and the current regulation portion, which includes first and second transistors connected in series to each other, between the second voltage reference and the internal node and having respective control terminals connected to a reference input terminal of the measuring circuit and to the enabling terminal of the current regulation portion, respectively.