Patent ID: 6433724
Filing Date: 2002-08-13
Classification: H03M

Abstract:
An analog-digital (A/D) converter for converting an analog signal to a digital signal, comprising:a set of sampling capacitor s each having first and second terminals, and at least partially weighted according to a binary code, the first terminals being connected to a common node; a plurality of switches each being associated with a respective sampling capacitor, each switch selectively connecting the second terminal of the respective sampling capacitor to one of first and second reference potentials; a comparator having first and second inputs and an output, the first input being connected to the common node; a first capacitive unit having a first terminal connected to the common node, and a second terminal; a charging switch for selectively connecting the second terminal of the first capacitive unit to one of an analog signal source and a third reference potential; a first cut-out switch connected between the common node and a fourth reference potential; a second cut-out switch connected between the second input of the comparator and the fourth reference potential; a second capacitive unit connected between the second input of the comparator and the third reference potential; a third capacitive unit connected between the second input of the comparator and the second reference potential; and a processing, control and register unit connected to the output of the comparator, and for operating the plurality of switches associated with the sampling capacitors, the charging switch and the first and second cut-out switches according to a predetermined timing program and based upon the output of the comparator, to store positions of the plurality of switches associated with the sampling capacitors and to output the digital signal based upon the analog signal to be converted.