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What is the most important consideration in power amplifiers?
The most important consideration in power amplifier is to provide maximum power to the load i.e. loudspeaker hence collector efficiency is an important consideration.
What is the maximum collector efficiency of a resistance loaded Class A power amplifier?
Explanation: The theoretical maximum efficiency of a Class A power amplifier is 50%. In practice, with the capacitive coupling and inductive loads (loudspeakers), the efficiency can decrease as low as 25%. This means 75% of power drawn by the amplifier from the supply line is wasted.
Why does a BJT circuit behave like an amplifier?
A common base BJT circuit behaves like a non-inverting amplifier circuit, due to the fact that its output signals is always in-phase with the input signal, meaning the output precisely replicates the input signal’s polarity without changing its attributes.
Where does the output signal come from in a BJT?
The input signal is fed across the base and emitter of the BJT, and the resulting output signal is derived across the base and the collector terminals of the BJT. The base signal is always referenced to the emitter terminal and its potential level.
How does a common base transistor circuit behave?
The Common Base Transistor Circuit A common base BJT circuit behaves like a non-inverting amplifier circuit, due to the fact that its output signals is always in-phase with the input signal, meaning the output precisely replicates the input signal’s polarity without changing its attributes.
Why is a common emitter amplifier used in a bipolar transistor?
The common emitter amplifier construction delivers the very best current and power gain among the 3 bipolar transistor designs. This is largely because the input impedance is SMALL since it is attached to a forward biased PN-junction, while the output impedance is LARGE since it is obtained from a reverse biased PN-junction.