Patent ID: 8232905

Claim:
An analog-to-digital converter system, comprising: a digital control circuit configured to sequentially configure the analog-to-digital converter system in a first configuration and a second configuration to derive a digital representation of an analog signal value; an amplifier circuit having an amplifier input terminal and an amplifier output terminal; a capacitor having a first capacitor terminal coupled to the amplifier input terminal in the first and second configurations of the analog-to-digital converter system and a second capacitor terminal coupled to the amplifier output terminal in the first configuration of the analog-to-digital converter system; and an evaluation circuit configured to provide a first digital code to represent a first voltage level at the amplifier output terminal in the first configuration of the analog-to-digital converter system; wherein the second capacitor terminal in the second configuration of the analog-to-digital converter system is coupled to a reference voltage potential selected according to the first digital code.