Stmicroelectronics S.a.

Thomson Multimedia S.a.

Thierry Rouzier

Pierre Dautriche

Bruno Bonhoure

Fr&eacute;d&eacute;ric Palllardet

An analog to digital converter transposes the input signal into two differential signals, which are applied to respective inputs of a differential comparator. The output of the differential comparator is linked to the input of the analog-digital converter by a circuitry loop for restoring a DC component of each of the differential signals at the mid-voltage of the conversion range of the analog-digital converter.

Analog-digital conversion device comprising a differential comparator

The present invention relates to a constant current generator including a reference voltage source providing a constant voltage with respect to a first ground; an operational amplifier receiving the constant voltage on a non-inverting input; and a follower transistor controlled by the output of the operational amplifier and connected between an input of a current mirror and a first resistor connected to the first ground. It further includes a second resistor connected between an output of the current mirror and a second ground, the output of the current mirror being also coupled to an inverting input of the operational amplifier; and a filtering circuit connected to reduce or eliminate, in the output signal of the operational amplifier, any high frequency ac component with respect to the first ground.

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Grenoble, France

Thierry Rouzier