Patent ID: 6784708
Filing Date: 2004-08-31
Classification: H03K

Abstract:
A method for realizing a stable high-voltage front-end for an output driver circuit, insensitive against supply voltage variations, comprising:providing a slope transformer circuit, a differentiator with clock, a regulator with clocked comparator and digital regulator part, and the output driver circuit driving an external load; transforming a static high supply voltage level into a static current; transforming a high-voltage input signal into a proportional current signal; combining said static current and proportional current signal into a resulting current input signal; mirroring said resulting current input signal into a proportional current output signal; generating a low voltage output signal representing said current output signal; performing differential transactions upon said low voltage output signal, in relation to given time steps from a clock generator; converting a low voltage differentiated output signal into a digital bit signal by a comparator using a given time step related reference; feeding said bit signal into a digital regulator part for further processing generate an digital output signal; convert said digital output signal into an analog signal as input to the output driver circuit; closing a regulator loop with an output signal from the output driver by feeding it back into a high voltage input signal; and driving a load with a high voltage output from the output driver.