Patent ID: 6346903
Filing Date: 2002-02-12
Classification: G09G

Abstract:
A device for generating a low-consumption controlling analogue voltage of stable value, from an analogue voltage of a given nominal value, said device comprising:an input circuit receiving said analogue voltage of a given nominal value and enabling a picture analogue voltage to be generated having a value reduced in a given ratio k; a driver circuit receiving said picture analogue voltage as a reference signal and a picture signal of said low-consumption controlling analogue voltage, said picture signal being formed by said low-consumption controlling analogue voltage reduced in the same given ratio k, said driver circuit having at least one differential amplifier supplied by a first constant voltage of an amplitude higher than the maximum value of said picture analogue voltage and by a second constant voltage of a given amplitude and outputting a first switch control pulse synchronous with said reference signal and of an amplitude lower than said first constant voltage and a second switch control pulse synchronous with said reference signal but complemented relative to said first switch control pulse; a switching circuit for said controlling analogue voltage, said switching circuit being supplied by said analogue voltage of a given nominal value and comprising at least: a first switching branch forming an inverter/amplifier, controlled by said first switch control pulse, said first switching branch outputting an amplified auxiliary switch control pulse, synchronous with said reference signal, and a second switching branch, forming an inverter/amplifier controlled by said amplified auxiliary switch control pulse and said second switch control pulse, said second switching branch outputting said controlling analogue voltage switched to said analogue voltage of a given nominal value.