b) A three-stage amplifier system operated at T = 25°C and 1 MHz bandwidth which is determined by an LC-tuned circuit. The first stage has a power gain of 10dB and an NF of 5dB, the second has a power gain of 20dB and NF=10dB, and the third stage has a power gain of 30dB and NF-10dB. The output load is 2000. The input noise is generated by a 20k resistor. Calculate: i) The noise voltage and power at the input and the output of this system assuming ideal noiseless amplifiers. ii) The overall noise figure for the system. iii) The actual output noise voltage and power.
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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