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Circuit Design Problem Add in library

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Question:

Describe about the Circuit Design Problem?
 
 

Answer:

Circuit Diagram:

The circuit has been designed with the given requirements.

Description:

Given, Av = -3.0

Now,

Av = Vout/Vin = - R3/R2 = -3.0

Rin = R2 = 1kΩ

Therefore, R3 = 3kΩ

Compensation capacitor, R1 = R2 || R3 = 0.75 kΩ

Since all these values are available (they are standard resistor values), we don’t have to take approximations or use resistor combinations.

Now,

fc = 1/(2πRC)

Given, fc = 3.3 kHz

Substituting the resistor value of R2 (as it is the part of the first order low pass filter), the value of C = 48.25 nF.

As 0.048µF is a standard capacitance value, it can be used.

The voltage supply considerations has been considered, as +15V and -15V are the standard Vcc for TL081, manufactured by Texas Instruments.

The offset is the circuit has been addressed by using a capacitor, and forming a low pass filter.

It could have also been addressed by using a potentiometer (variable resistance) at R3, and tuning it.

To address the input biased current, the compensator resistance R1 is added, which is R2 || R3.

The source used to obtain the standard resistor and capacitor values has been mentioned in the reference section.

 

References

Datasheet of TL081. Texas Instruments. Can be accessed from <https://www.ti.com/lit/ds/snosbw6a/snosbw6a.pdf>

Design with Operational Amplifiers and Analog Integrated Circuits, 4th Ed, Sergio Franco, McGraw Hill.

Standard Resistor and Capacitor values obtained from <https://ecee.colorado.edu/~mcclurel/resistorsandcaps.pdf>

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