A three-stage amplifier is to have an overall noise temperature no greater than 70k. The overall gain of the amplifier is to be at least 45 dB. The amplifier is to be built by adding a low-noise first stage to an existing two-stage amplifier that has the gains and noise figures shown below. (The stage numbers refer to locations in the new amplifier). Stage Power Gain Noise Figure 2 20 dB 3 dB 3 15 dB 6 dB Suppose the gain of the first stage could be increased by 3 without affecting its noise figure. What would be the effect on the noise temperature of the complete amplifier? a. Reduced by 15 K b. Increased by 15 K c. Increased by 30 K d. Reduced by 30 K
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.
A three-stage amplifier is to have an overall noise temperature no greater than 70k. The overall gain of the amplifier is to be at least 45 dB. The amplifier is to be built by adding a low-noise first stage to an existing two-stage amplifier that has the gains and noise figures shown below. (The stage numbers refer to locations in the new amplifier).
Stage Power Gain Noise Figure
2 20 dB 3 dB
3 15 dB 6 dB
Suppose the gain of the first stage could be increased by 3 without affecting its noise figure. What would be the effect on the noise temperature of the complete amplifier?
a. Reduced by 15 K
b. Increased by 15 K
c. Increased by 30 K
d. Reduced by 30 K
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