Vcc R1 V CE BE Figure P13.138
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.
The simple C-E amplifier shown is biased with VCE = VCC/2. Assume that the transistor can saturate with VCESAT = 0 V and still be operating linearly. What is the amplitude of the largest sine wave that can appear at the output? What is the ac signal power Pac being dissipated in the load resistor RL? What is the total dc power PS being supplied from the power supply? What is the efficiency ε of this amplifier if ε is defined as ε = 100% × Pac/PS?
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