- Jan 1, 1970
an amplifier circuit which uses power transistor is called power
amplifier .the are classified based on conduction angle.there are four
categorizes of power amplifiers they are
class A- conduction angle 360degrees
class B-conduction angle 180degrees
classC-conduction angle less than 180degrees
classAB-conduction angle more than 180 degrees
further classA is classified into
1.series fed class A power amplifier .
2.transformer coupled class A power amplifier.
SERIES FED CLASSA
it is called series fed because output is connected in series.
*the output signal is the exact replica of the input signal and has
*it has very less efficiency and has maximum efficiency of 25%.
the efficiency is less because in circuit we have resistor at collector
of transistor due to voltage drop across this resistor we have less
to overcome this disadvantage we go for transformer coupled classA
where we use transformer in place of resistor of seriesfed due to which
voltagedrop reduces and efficiency increasesand it has a maximum
efficiency of 50%.
I would like to discuss this topic later.
Oh please do. We don't get unsolicited lectures very often. ;-)