A piezoelectric displacement sensor can be modeled with a 75-GQ in parallel with 250 pF capacitor. It is to be used for monitoring the vibration of a structure above 75 Hz. Since the output of this sensor is only 10μV and requires amplification by a factor of 100 to drive an actuator, you decided to use an off-the shelf amplifier with the lowest possible cost. If there are the following three amplifiers available providing the desired amplification, then select a most economical unit that will work.
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.
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