| 摘要 |
PURPOSE:To ensure the frequency characteristics of a feedback circuit and to control the peaking characteristics, by connecting a bias resistance between emitters of transistors which are Darlington-connected to a part of a negative feedback circuit. CONSTITUTION:A by-pass circuit consisting of a by-pass resistance 11 is provided from the emitter of the 1st feedback transistor TR9 through the emitter of the 2nd feedback TR10. Thus the emitter current of the TR9 can be controlled by changing the value of the resistance 11. At the same time, the high frequency characteristics of the TR9 can be controlled by the resistance 11. A wide band amplifying circuit has the peaking characteristics when the feedback quantity of a negative feedback circuit is reduced at the high frequency side. This peaking characteristics can be controlled by changing the resistance 11. |
