| 摘要 |
PURPOSE:To eliminate digitally noise by detecting the noise included in a reference voltage and selecting an output of an A/D converter and an output of a timing adjusting circuit based on the detection so as to utilize the noise of the reference voltage. CONSTITUTION:A selection signal 11 latched by a flip-flop 10 is used as a control signal of a selection circuit 12 to select a digital signal of a low-order 2-bit outputted from an A/D converter 1 and a digital signal of a low-order 2-bit outputted from a timing adjusting circuit 1A. If noise is inscluded in a reference voltage 5, the low-order bit of the digital signal 6 is effected by the noise and the low-order bit of the digital signal effected by the noise is replaced with a digital signal subject to A/D conversion and the result is outputted. As to the low-order 2-bit of the digital signal, the time adjustment is applied by a holding circuit 8 and a delay circuit 13 and all bits together with the low-order 2-bit selected by the selection circuit 12 are latched by a latch circuit 3.
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