R Amplifier RL (two-port)
Power Amplifier
The power amplifier is an electronic amplifier designed to maximize the signal strength of a given input. The input signal strength is enhanced to a high enough level to drive output devices such as speakers, headphones, RF (Radio frequency) transmitters, etc. Unlike voltage / current amplifiers, the power amplifier is designed to drive core loads directly and is used as a storage block in the amplifier series.
Maximum Efficiency Criterion
In every field of engineering, there is a tremendous use of the machine and all those machines are equipped for their popular work efficiency so it very much important for operation engineers to monitor the efficiency of the machine, planning engineers to check out the efficiency of the machine before installing the machine and design engineers to design machine for higher efficiency than and then the utility will procure their products that will ultimately lead to profit and loss of the company. It indicates the importance of efficiency right from the initial stage as manufacturing units, intermediate stage as planning coordinators, and end-users stage as a utility.
Suppose that the amplifier as shown has been
designed to match the source and load resistances
with the parameters below. (a) What is the amplitude
of the input signal vi needed to deliver 1 W
to the 16- load resistor? (b) How much power is
dissipated in the amplifier when 1Wis delivered to
the load resistor?
Input resistance Rin = 1 k
Output resistance Rout = 16
A = 50 dB
Converting the value of gain from decibel to normal value
Calculating voltage at input side
Calculating output voltage
Substituting value of input voltage in the above equation
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