Analog-to-digital converter |
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| 申请号 | JP6548581 | 申请日 | 1981-04-30 | 公开(公告)号 | JPS57181226A | 公开(公告)日 | 1982-11-08 |
| 申请人 | Nec Corp; | 发明人 | NAKASHIMA MASAHIKO; | ||||
| 摘要 | PURPOSE:To reduce the chip area of a parallel A/D converter by obtaining the low-order digit bits by obtaining a local analog signal which corresponds to the high-order digits by 2 units of switches, and then finding a difference between a sampled value and the local analog signal. CONSTITUTION:A group of reference voltages and an analog signal are compared mutually by comparators 141-147. Detecting circuits 152-157 find two comparators which output a ''0'' and a ''1''. A detecting circuit 151 detects all the comparators 141-147 outputting ''1''s, and a detector 158 detects all the comparators 141-147 outputting ''0''s. Their detection signals are converted by an encoder 16 into digital signals, which are outputted to output terminals 17. According to those outputs, switches 121-128 operate to lead a prescribed voltage to an output terminal 11. | ||||||
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| 说明书全文 | |||||||
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