| 摘要 |
PURPOSE:To prevent the fluctuation in a synchronized compression level, by applying a constant current to an input point of an emitter follower circuit, in a synchronizing peak value clamp circuit. CONSTITUTION:A constant voltage obtained at a reference voltage generating circuit 1 is applied to a base of an emitter follower transistor (TR) 4 through diode 2. Another constant voltage obtained from the circuit 1 applied to a TR6. A video signal 8 is applied to the TR4 through a coupling capacitor 3. A constant current circuit 5 gives a constant current to the TR4. Thus, since the base current of the TR4 can be made to a desired constant value, the synchronized compression level can not be affected with the base current of the TR4. |
