| 摘要 |
PURPOSE:To provide adder/subtracter which can select addition, subtraction and single output by using the switch of ON/OFF only. CONSTITUTION:A first switch SW1 is inserted between one input terminal Ia and the inverted input terminal of an operational amplifier 1. A second switch SW2 is inserted between another input terminal Ib and the inverted input terminal of the operational amplifier 1. Further, a third switch SW3 is inserted between the other input terminal Ib and the non-inverted input terminal of the operational amplifier 1. In order to get an added value, the switches SW1 and SW2 are turned on. In order to get a subtracted value, the switches SW1 and SW3 are turned on. In the case of singly outputting one analog signal, the switch SW1 is turned on and the switches SW2 and SW3 are turned off. Otherwise, the switch SW2 is turned on and the switches SW1 and SW3 are turned off. |
