طرق الربط بين مكبرات التردد المتوسط وتوافق الممانعات .. كتاب التلفزيون الملون والعادي

6- 7 Methods of linking medium frequency amplifiers and matching impedances

(Impedance Matching)

The compatibility of the input impedance of each circuit with the output of the previous circuit to which it is connected is very important in achieving the largest gain and the least interference and noise - the impedance compatibility between the collector transistor in the amplifier and the base of the transistor after it must be achieved - and it is used Therefore, the method of connecting to the common emitter in IF circuits can also be used to connect the transformer with the appropriate and correct number of windings for the input and output impedances.

1 - Inciting double.

2- Capacitive coupling.


3- Co-inductive coupling.

4 - common capacitive coupling

In transistor devices, the method shown in Figure (6-21) is used. To connect two transistors.
The method of modifying the feedback in the
transistor circuit (Neutralization)

In the transistor, feedback occurs between the collector of the transistor and its base through the internal capacitive link between the collector and the base. Figure (6-22).