| 摘要 |
PURPOSE:To economically realize an A/D converter for a broad band at high accuracy by cascade-connecting unit interpolating type A/D converters for plural stages. CONSTITUTION:Unit interpolating type A/D converters 1 and 2 at the same constitution are cascade-connected. In the A/D converter 1, an analog input signal detects an error voltage by a feedback signal from a local D/A converter 102 and a differential circuit 103, and adds an output to the error until a last sampled value by an analog integrating circuit 104. After the error is added again by an adder circuit 105, the output decides the polarity and the level of the error integral value by a voltage comparing circuit 106. A logical circuit 107 converts the output signal of the voltage comparing circuit 106 into the complement displaying signal of the converter 2. The output is applied through a digital integrating circuit 108 and the local D/A converter 102 to the differential circuit 103 as a comparative feedback signal. The input signal and output signal of the integrating circuit 108 and their arithmetic addition value are derived as the outputs.
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