Transistor Broadband Video Amplifier

Transistor Broadband Video Amplifier

Shown is a wide-band video amplifier using a common emitter and a common base , which is composed of two transistors. The video signal R is added to the base of the common emitter transistor VT902. VT902 is connected as a common emitter amplifier, so it has a higher gain. The output of the collector of VT902 is directly sent to the indigo emitter of VI901. VT901 is connected as a common base amplifier, so it has the characteristics of wide frequency and amplification The final video signal is sent to the cathode of the picture tube from the VT901 collector output. This circuit gives full play to the characteristics of the two circuits, and the circuit is simple and has good performance. Common emitter , common collector and common base amplifier circuits are the three most basic unit circuits in single-tube amplifiers, and all other amplifier circuits can be regarded as their deformations or combinations. Therefore, it is very necessary to master the properties of these three basic unit circuits.