Patent ID: 7408494

Claim:
A continuous-time delta-sigma analog digital converter for converting an analog input signal (IN) to a digital output signal (OUT), comprising: an analog filter ( 20 ) which filters the analog input signal (IN) and has at least one integration capacitor, a quantifier ( 30 ) operated in cycled fashion, which quantifier quantifies the filtered analog signal transmitted by the analog filter for generating the digital output signal (OUT), and a feedback device ( 40 ) with at least one digital analog converter, which device transmits at least a first analog feedback signal to analog filter ( 20 ) corresponding to the value of the digital output signal (OUT), wherein the feedback device ( 40 ) comprises a switching device (INV 1 , INV 2 ) actuated by the digital output signal (OUT) of the quantifier ( 30 ) and coupled capacitively (Cc 1 , Cc 2 ) to the integration capacitor for generating a second feedback signal corresponding to the differentiated output signal of the quantifier ( 30 ), by means of which device charge portions are transmitted to the integration capacitor if there is a variation in the digital output signal (OUT), wherein the charge portions correspond to the amount of the variation.