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A practical amplifier always consists of a number of stages that amplify a weak signal until sufficient power is available to operate a loud-
speaker or other output device. The first few stages in this multistage amplifier have the function of only volt- age amplification. However, the last stage is
designed to provide maximum power. This final stage is known as power stage.
The term audio means the range of frequencies which our ears can hear. The range of human hearing extends from 20 Hz to 20 kHz.
Therefore, audio am- plifiers amplify electrical signals that have a frequency range corresponding to the range of human hearing i.e. 20 Hz to 20 kHz.
Fig. 12.1 shows the block diagram of an audio amplifier. The early stages build up the volt- age level of the signal while the last stage builds up power to a level
sufficient to operate the loudspeaker. In this chapter, we shall talk about the final stage in a multistage amplifier—the power amplifier.
A transistor amplifier which raises the power level of the signals that have audio frequency range is known as transistor audio power amplifier.
In general, the last stage of a multistage amplifier is the power stage. The power amplifier differs from all the previous stages in that here a concentrated effort
is made to obtain maximum output power.
A transistor that is suitable for power amplification is generally called a power transistor. It differs from other transistors
mostly in size ; it is considerably larger to provide for handling the great amount of power. Audio power amplifiers are used to deliver a large amount of power to a
low resistance load. Typical load values range from 300 (for transmission antennas) to 8 (for loudspeakers). Although these load values do not cover every possibility,
they do illustrate the fact that audio power amplifiers usually drive low-resistance loads. The typical power output rating of a power amplifier is 1W or more.
N-type semiconductors are formed by adding ______ Impurity to a Pure Semiconductor
In Intrinsic semiconductors number of electrons are to number of
Conduction in P-type semiconductor is due to movement of _____.
Value of knee voltage for silicon diode is ____.
A Photodiode is optimized for its sensitivity to
Zener diode is made to operate in _____ Region
Zener Breakdown Region
A transistor contains______PN Junction
The gain stability of an amplifier circuit can be improved by using ____.
The value of collector current of a transistor is ____ to emitter Current.
Always Less than
In transistor, leakage current mainly depends on _______.
The ideal value of stability factor is ____.
FET is a _____ terminal semiconductor
MOSFET stands for __________
Metal Oxide Filed Effect Transister
When both the junctions of a transistor are forward biased, it is said to be in _______________ Region
Explain Intrinsic and Extrinsic Semiconductor with Suitable Diagram ?
Intrinsic and Extrinsic Semi-conductor Click Here.
What is Zener diode? Draw its symbol and explain its characteristics.
What is Zener diode? Draw its symbol and characteristics
Explain the Working of Half Wave Rectifier
Working of Half wave Rectifier click here
Explain the working of NPN Transistor ?
Working of NPN Transistor Click Here
Difference Between FET and BJT ?
h-Parameters (hybrid Parameter) of transistors ?
hybrid Parameter) of transistor
In what way the temperature variations affect the operating point of a transistor?
Temperature variations affect the operating point of a transistor
Explain the Phase reversal of output voltage with respect to input voltage in an Amplifier ?
Phase reversal of output voltage with respect to input voltage in an Amplifier
Needs of filter ? Explain π (Pi) filter
Need of Filter Pi Filter Click Here
Derive an expression for amplification factor (β) of common emitter configuration ?
Full Wave common emitter configuration
Explain the divider method of biasing for transistor (CE)
Divider method of Biasing
Input and Output Characteristics of CE configuration of a Transistor ?
CE configuration of a Transistor Click Here
Concept of CMOS,Advantages and Application ?
CMOS Full Detials
Concept of Bipolar Transistor Symbol of BJT
Concept of Bipolar transistor
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