Q (i) Sketch a feasible class A silicon BJT Power Amplifier that provides a high voltage gain using 15 volts supply and employs a concept to increase its loaded efficiency to 50% so that little power loss is provided at the collector terminal. Given by manufacturer for safe operation, the amplifying component has a DC current gain of 200 and a collector current limit of 4mA. The output stage of the Amplifier drives a headphone with 32-ohms load impedance applicable for smartphones.
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.
Q (i) Sketch a feasible class A silicon BJT Power Amplifier that provides a high voltage gain using 15 volts supply and employs a concept to increase its loaded efficiency to 50% so that little power loss is provided at the collector terminal. Given by manufacturer for safe operation, the amplifying component has a DC current gain of 200 and a collector current limit of 4mA. The output stage of the Amplifier drives a headphone with 32-ohms load impedance applicable for smartphones.
(ii) Use a DC load-line to graphically find the three operating points of the amplifier.
(iii) On the load line, sketch the respective AC signal at each operating point of the amplifier during its dynamic condition.
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