(a) Calculate the noise generated from the power supply, Noise B. Assume the equivalent input noise current of the amplifier is negligible, and that room temperature conditions of 22 °C apply. (b) Calculate the total noise in the system. (c) Calculate the Signal to Noise ratio at the output signal (main signal with noise).
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.
![An ideal voltage amplifier has a voltage gain of 10 (Vout/Vin) as shown in Figure Q3 and it
is connected with a voltage source with an internal resistance and signal bandwidth of 1
k and signal bandwidth of 1 MHz, respectively. The noise level in r.m.s of Noise A
(radiation noise) is 25 µV and Noise B is the noise flow (power source). The r.m.s. input
voltage is 0.707 V and it is uniform over the frequency band. The contribution to the r.m.s.
noise voltage from thermal noise inside a resistor is given by the following equation,
v₁ =√4xkxTxBxR
Equation 3
where: V₁= the r.m.s. noise voltage, Volt
k = the Boltzmann constant, 1.38×10-23 J/ºK.
T = temperature, °K
B= frequency bandwidth, Hz
R = resistance value of the resistor,
(a) Calculate the noise generated from the power supply, Noise B. Assume the equivalent
input noise current of the amplifier is negligible, and that room temperature conditions
of 22 °C apply.
(b) Calculate the total noise in the system.
(c) Calculate the Signal to Noise ratio at the output signal (main signal with noise).
4
62 24
Ideal voltage amplifier
Input Signal
@
Noise A
Output Signal
Noise B
Figure Q3 Noise influence over the amplified main signal](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6a30be74-a81e-4985-b94d-4cd71e619e2d%2F797038fc-5ab1-4ffe-960e-2d29fdc7bf56%2F28zxk3f_processed.png&w=3840&q=75)
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