| 摘要 |
PURPOSE:To prevent deterioration in the characteristic due to switching noise by eliminating the need for a sampling switch in a current drive type A/D converter. CONSTITUTION:The A/D converter is provided with a voltage/current conversion circuit 1, a local D/A converter circuit 2 whose output current is controlled by a digital signal, an output current difference to an analog circuit 3 whose one terminal connects to a DC potential point is integrated and a voltage resulting from the integration is quantized by a quantization circuit 4, the result is integrated by a digital integration circuit 5 and the integrated value is given to a feedback quantity correction circuit 6 and the result of A/D conversion is outputted. The feedback quantity correction circuit 6 applies correction to cancel an analog error sampled by the analog circuit 3 to the digital signal till the output of the quantization circuit 4 is reflected on an output of the local D/A converter circuit 2 (till digital integration is implemented to a quantization output).
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