| 摘要 |
PURPOSE:To obtain a rapid response always constant regardless of the level of an input voltage by charging a capacitor with constant current by the output from a transistor differential switching circuit in case when the external input voltage is higher than the potential of the capacitor terminal. CONSTITUTION:When the input voltage goes to higher than the output voltage, the output from a comparator turns a transistor 4 ON, so that the capacitor 2 is charged with constant current by the output current from the transistor 4. And the output voltage rises linearly as time lapses. When the output voltage reaches a level equal to that of the input voltage, the output from a voltage comparator 1 turns the transistor 4 OFF terminating the charging of the capacitor 2. As a result, the response level is made at all time constant regardless of the level of the input voltage, and the constant current can be optionally set by means of a constant current element 5. Therefore, the response is speeded. |
