| 摘要 |
PURPOSE:To set an entire amplifying circuit under a stable working state as soon as a power supply is applied, by securing a quick rise for both positive and negative side input terminals of an operational amplifying circuit. CONSTITUTION:The bias V1 at a positive side input terminal (a) of an operational amplifier 1 is applied from the resistances 7 and 8 and has a rise with a small time constant which is decided by a resistance 5 and a capacitor 6. The bias V2 at a negative side input terminal (b) is previously increased by the resistances 10, 11 and a capacitor 12. In this connection, the resistances 10 and 11 are set at a low level respectively, and the time constant decided by the resistance 10 and the capacitor 12 is set at a small value. As a result, the rise time can be shortened. |
