| 摘要 |
PURPOSE:To simplify the circuit and to stabilize the operation by applying an output of a DA converter to a drain of the 1st FET in the absence of a sampling pulse, applying an output of the 1st FET to a sequential comparison circuit so as to vary the output of the DA converter thereby obtaining a digital value corresponding to the input signal. CONSTITUTION:The input signal is fed to a capacitor 4 through a 1st FET 1 at the application of the sampling pulse. In the absence of the sampling pulse, the 1st FET 1 and 2nd FET 2 are turned off and 3rd FET 3 is conductive, then an output of the DA converter 6 is fed to a terminal (a). In this case, if the output of the DA converter 6 is higher than the voltage at sampling even slightly, the voltage at the terminal (b) changes in the increasing direction and the output of an inverse amplifier 9 goes to an L level, and if the output is lower than the original sampling even slightly similarly, the voltage at the terminal (b) changes in the decreasing direction and the output of the inverse amplifier 9 goes to an H level.
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