| 摘要 |
PURPOSE:To obtain a high-precision arithmetic result by eliminating an error due to a feedthrough and an error due to the offset of an amplifier by a combinational logical circuit which generates driving signals for the 1st - the 4th analog switches. CONSTITUTION:When data applied to a data input terminal 2 is ''+1'', switches 8-5 and 8-8 are turned on to fetch an analog signal applied to an input terminal 1 in a capacitor 10 temporarily. Then switches 8-6 and 8-7 are turned on to charge an output capacitor 11. When the data is ''-1'', the switches 8-6 and 8-7 are turned on directly to charge the output capacitor 11 through the input capacitor 10. When the data is ''0'', the switches 8-6 and 8-8 are turned on firstly to reset the charge in the input capacitor 10, and then the switches 8-6 and 8-7 are turned on to perform transfer to the output capacitor 11. |
