| 摘要 |
PURPOSE:To output the voltage across a capacitor as an analog voltage and to simplify circuit constitution, by applying the capacitor with a digital signal applied between one terminal of a resistance element and the ground through a diode. CONSTITUTION:When there is a pulse input which holds a terminal A at a high level, the capacitor C is charged through a diode D1 and the output at an output terminal Va increases. On the other hand, when there is a pulse input which holds a terminal B at a low level, the capacitor C is discharged through a diode D2. At this time, the output Va varies in accordance with control based upon the frequency of the charging and discharging of the capacitor C, i.e. the digital signal. Then, the constants of the R and C are set to proper values to obtain the output Va with small step width. |
