Patent ID: 7405687

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, a quantifier ( 30 ) cycled by a clock signal (CLK), which quantifier quantifies the filtered analog signal transmitted by analog filter ( 20 ) for generating the digital output signal, and a feedback device ( 40 ) with at least one digital analog converter, which device transmits at least one analog feedback signal to analog filter ( 20 ) on the basis of the digital output signal (OUT), characterized in that the feedback device ( 40 ) comprises a first digital analog converters ( 44 - 1 ) for generating a feedback signal corresponding to a delayed output signal of the quantifier, to which converters the digital output signal (OUT) of the quantifier ( 30 ) is transmitted via a first delay element ( 42 - 1 ) with a first delays, wherein a second delay element ( 42 - 2 ) is provided, to which the digital output signal delayed by the first delay is transmitted, and which supplies this signal delayed by a second delay at the input of a second digital analog converter ( 44 - 2 ), wherein the analog output signals of the two digital analog converters ( 44 - 1 , 44 - 2 ) are transmitted to an analog subtractor ( 24 - 3 ) for generating a feedback signal corresponding to a differentiated output signal of the quantifier ( 30 ).