| 摘要 |
PURPOSE:To reduce the power consumption, the cost and to make the size small by adopting one sample-and-hold circuit in common for each input for sample-and-hold circuits having been provided to each input. CONSTITUTION:Analog signals V1-V4 are duplexed into 1st groups V1 V4 and 2nd groups V1'-V4' and they are given to a multiplexer 10, and the 1ast groups V1-V4 are extracted in time series for each sampling period from the multiplexer 10 and the 2nd groups V1'-V4' are extracted in a reverse time series to that of the 1st groups V1-V4 within the same period as the sampling period. Then both the groups are A/D-converted and mean values of same input signals of the digital signals of the 1st groups V1-V4 and the 2nd groups V1'-V4' are obtained. That is, direct approximation is established by decreasing the sampling period, it is regarded that plural analog signals are sampled at the same time by obtaining mean values of the same input data in the approximated region. |
