Q4 a) Explain the DC imperfections of operational amplifiers. Draw a complete model of an operational amplifier with these imperfections.
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.
![Q4 a) Explain the DC imperfections of operational amplifiers. Draw a complete
model of an operational amplifier with these imperfections.
b) Consider the amplifier circuit shown in Figure Q4.b with a non-ideal
operational amplifier and an ideal input voltage source, show that the DC
output voltage with the signal voltage turned down to zero will be:
R1 + R2) [+Vos + IppR3] – IBnR2
R,
R2
R1
R3
Vo
Figure Q4.b
The amplifier in Figure Q4.b has an offset voltage Vos = ±3 mV, input bias
current Ig = 13 µA and input offset current Ios = 6 µA. Calculate the
maximum absolute output voltage that could occur due to the bias currents
and offset voltage alone (i.e. with the signal source remaining in the circuit
but turned down to zero volts), given that R1 = 1 kN, R2 = 100 k2 and R3 =
0Ω.
d)
An operational amplifier with a slew rate limit of 1 V/us is required to
amplify a sinusoidal 100 kHz signal. Calculate the maximum amplitude of
the output voltage that can be achieved without distortion.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7f0069ce-7c3f-43d4-9141-588239e37101%2F0156f6ee-0666-4ffc-aef6-7c7ddca2ac0e%2Fodc0m28_processed.png&w=3840&q=75)
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