Amplifiers of power

1) Consequences of the hypothesis of income of the linear transistor:

For a loaded data in escape the valid adaptation also to high power can be adapted the income to low power and be considered.

 

2) Method âLoad-Pullâ?:

The amplifier comes fed from the source by means of an insulator, Bias-T that supplies the polarization and a tuner that the adaptation concurs. After the amplifier one finally has a second tuner and according to Bias-T and a power meter. This outline concurs to find the curves to maximum gain and those to maximum power and therefore determine the points of the maximum efficiency that are those of intersection between the two families of curves.

 

3) Method of analysis for a strongly not linear amplifier:

The transistor like a not linear transimpedenza is considered, it derives some that famous the shape of wave of the tension in income is specified also the shape of wave of current in escape, the scope is to make that when it is not null, it is null the shape of wave of tension in escape and viceversa. In the case of an amplifier in B class the ideal is that the shape of wave of tension in escape is a wave quadrant, that obtains making so that every harmonica sees determined loaded in particular harmonicas equal must see a short circuit while the uneven harmonicas must see a circuit opened, both these cargos does not absorb power that therefore will be all to disposition of the fundamental one.