Exercise 1 For the circuit given below, and find the formulas for: Vout a. Output voltage gain, which is defined as Ay = %3D b. Input impedance Zin looking from the point B and ground looking toward the output end as indicated by the arrow. c. Output impedance Zout looking from the load toward the input end as indicated by the arrow. Zout Zin Ri C VBE In DgmVBE Rc RL Vout Vi RB ro E

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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.