| 摘要 |
PURPOSE:To make it hard to be influenced by a noise which has been superposed on an input signal, by giving hysteresis to the output inversion. CONSTITUTION:When the input voltage VIN1 applied to the terminal 1 rises up from a state that is enough lower than the input voltage VIN2 applied to the terminal 3 and VIN1 becomes higher than VIN2 exceeding the product IR1 of value R1 of the resistance 5, and the current I, the current starts to flow into the transistor 2. As a result, the current flows into the transistor 8, as well, therefore, voltage drop at the resistance 6 increases, the current of the transistor 4 decreases, and voltage drop at the resistance 5 decreases. Accordingly, a positive feedback action operates and the current flowing into the transistor 2 increases. In order to invert the output, it is necessary that VIN2 becomes higher than VIN1 exceeding the product of value R2 of the resistance 6, and the current I. |
