| 摘要 |
PURPOSE:To suppress the DC offset voltage signal level output from the output terminal at no signal to sufficiently small value, by providing the offset compensation resistor. CONSTITUTION:The DC voltage Vo at the output terminal OUT is Vo=R3/2beta, at no signal where the current gain is denoted as beta and the base resistance as R3 for the transistor Q2, by the presence of the offset compensation resistor R2, this means the voltage is at low level. By using the pinch resistance being the specific resistivity proportional to the current gain beta of the transistor Q1 for the ground resistor R1, desired effect of amplification can be obtained, even if dispersion is present in the current gain of npn transistors in the manufacturing process of monolithic IC. |
