a) The overall Noise Temperature (Te) of a 2-stage cascaded amplifier is given as 1869 deg K. The gain of the first stage is 13 dB and the Noise Temperature (Te1) of the first stage is 1212 deg K. ) Find the Noise Ratio(F2) , (i) Noise Figure (NF2) and the Noise temperature(Te2) of the second stage (ii) Also find the overall output S/N ratio, if the input S/N ratio of the cascaded receiver is 67. Assume the reference temperature is 24 deg C. b) The thermal noise power available from a 78 ohm resistor, is -108 dBm. It is kept at a temperature of 24 deg C. Calculate (i) the noise power bandwidth (B). (ii) Thermal Noise voltage across this resistor. (Assume the Boltzmann's constant k = 1.38 x 10^-23 joules/ deg K.) (Answer the question in separate sheet, scan and upload along with the other descriptive answers)
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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