| 摘要 |
PURPOSE:To improve noise resistance without giving a load to a CPU, by providing a plurality of S/H amplifiers and obtaining a high-speed data processing through the output of the amplifiers applied uniformly. CONSTITUTION:A data pickup request is given from a CPU5 to an input point 10 and a controller 4 closes an analog multiplexer S0 for a prescribed pulse section. Then, an analog signal E10 appears at this pulse section and is inputted to S/H amplifiers 7A-7D. A hold indication signal is outputted sequentially from the timing controller 4 to the amplifiers 7A-7D in the prescribed timing. As a result, the signal level at hold timing is outputted from the amplifiers 7A- 7D. Even if noises take place at a certain hold timing, since an adder 8 uniformly sums the output of the amplifiers 7A-7D, a value close to a true value of the analog input is outputted. Then, high-speed data processing can be attained, because no delay due to filtering and amplifiers is used. |
