| 摘要 |
An A/D converter for converting an analog input into a binary-encoded word includes a bit-weight memory storing bit weights that include maximum, mimimum, and medium weights. During a conversion step, first and second registers store lower and upper weights, and a D/A converter converts one of the upper and lower weights into an analog bit-weighting signal. A comparison device provides a comparison result indicative of a comparison between the analog input and the analog bit-weighting signal and stores the result in a third register. A multiplexer selects the upper weight when the analog input exceeds the analog bit-weighting signal and the lower weight otherwise. A subtractor subtracts, from the bit weight of a preceding conversion step, a smaller weight that is smaller than, but closest, to the previous bit weight. An adder adds the new lower weight to the smaller weight to get a new upper bit weight.
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