Patent ID: 6118830
Filing Date: 2000-09-12
Classification: H03M,H04N

Abstract:
An integrated circuit comprising inter alia a DC restoration device which has a main signal path in which a capacitor is included upstream of an analog/digital converter in which a conversion is triggered by a clock, comprising threshold detectors each provided with an input and an output and means for supplying at the output a logic signal if the input voltage exceeds a given threshold value which is different for each threshold detector, and comprising at least two current generators each provided with a control input and with a current output and with means for supplying upon command a calibrated current which is to be fed into the capacitor, the output of the analog/digital converter being connected jointly to the inputs of all threshold detectors, characterized in that several threshold detectors have a positive detection threshold such that the threshold voltage levels from one detector to the next show a progression proportional to successive powers of two, and several other threshold detectors have a negative detection threshold such that the absolute threshold voltage values also show a progression proportional to successive powers of two, while a current generator corresponds to each threshold detector, the outputs of all the current generators being connected such that their currents are added together.