| 摘要 |
The invention concerns a continuous-time delta-sigma analog-digital converter for the conversion of an analog input signal into a digital output signal, comprising an analog filter which filters the analog input signal and at least one externally circuited operational amplifier (OPAMP) for the formation of an integrator stage, a clock-driven quantiser, which quantises the filtered analog signal outputted through the analog filter to generate the digital output signal, and a feedback arrangement with at least one digital-analog converter, which supplies to the analog filter at least one feedback signal on the basis of the digital output signal. For the reduction of the necessary amplification-bandwidth product for the operational amplifier (OPAMP) it is stipulated according to the invention that the operational amplifier (OPAMP) has a first amplifier path (gm 3 ) and parallel to this a second amplifier path (gm 2 , gm 5 ), wherein the transit frequency of the second amplifier path (gm 2 , gm 5 ) is lower than the transit frequency of the first amplifier path (gm 3 ).
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