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Inverting and Non-Inverting Amplifiers using Op-Amps: Design, Implementation, and Analysis, Study notes of Electronics

National Institutes of Technology (NITs)Electronics

A comprehensive guide to designing and implementing inverting and non-inverting amplifiers using operational amplifiers (op-amps). It covers the theoretical principles, practical circuit diagrams, and experimental procedures for both types of amplifiers. The document also includes a detailed explanation of the 741 op-amp, its characteristics, and its applications in various circuits. It further explores the concept of gain, input and output waveforms, and the role of feedback resistors in determining amplifier performance. Suitable for students studying electronics, electrical engineering, or related fields.

Typology: Study notes

2021/2022

Uploaded on 12/01/2024

mahima-thakur
mahima-thakur ๐Ÿ‡ฎ๐Ÿ‡ณ

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INVERTING AND NON-INVERTING AMPLIFIERS USING OP AMPS
AIM: Design and realize Inverting and Non-inverting amplifier using
741 Op-amp. Apparatus Required: Bread Board, 741 IC, ยฑ12V
supply, Resistors and connecting leads.
Theory:
An inverting amplifier using op-amp is a type of amplifier using op-amp where the output
waveform will be phase opposite to the input waveform. The input waveform will be amplifier
by the factor Av (voltage gain of the amplifier) in magnitude and its phase will be inverted. In the
inverting amplifier circuit the signal to be amplified is applied to the inverting input of the op-
amp through the input resistance R1. Rf is the feedback resistor. Rf and Rin together determine
the gain of the amplifier. Inverting operational amplifier gain can be expressed using the equation
Av = โ€“ Rf/R1. Negative sign implies that the output signal is negated. The circuit diagram of a
basic inverting amplifier using op-amp is shown below.
The input and output waveforms of an inverting amplifier using op-amp is shown
below. The graph is drawn assuming that the gain (Av) of the amplifier is 2
and the input signal is a sine wave. It is clear from the graph that the output
is twice in magnitude when compared to the input (Vout = Av x Vin) and
phase opposite to the input.
Practical inverting amplifier using 741.
A simple practical inverting amplifier using 741 IC is shown below. uA 741 is a high
performance and of course the most popular operational amplifier. It can be used in a verity of
applications like integrator,
Differentiator, voltage follower, amplifier etc. uA 741 has a wide supply voltage range (+/-22V
DC) and has a high open loop gain. The IC has an integrated compensation network for
improving stability and has short circuit protection. Signal to be amplified is applied to the
inverting pi (pin2) of the IC. Non inverting pin (pin3) is connected to ground. R1 is the input
resistor and Rf is the feedback resistor. Rf and R1 together sets the gain of the amplifier. With
the used values of R1 and Rf the gain will be 10
pf3
pf4
pf5

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INVERTING AND NON-INVERTING AMPLIFIERS USING OP AMPS

AIM: Design and realize Inverting and Non-inverting amplifier using 741 Op-amp. Apparatus Required: Bread Board, 741 IC, ยฑ12V supply, Resistors and connecting leads. Theory: An inverting amplifier using op-amp is a type of amplifier using op-amp where the output waveform will be phase opposite to the input waveform. The input waveform will be amplifier by the factor Av (voltage gain of the amplifier) in magnitude and its phase will be inverted. In the inverting amplifier circuit the signal to be amplified is applied to the inverting input of the op- amp through the input resistance R1. Rf is the feedback resistor. Rf and Rin together determine the gain of the amplifier. Inverting operational amplifier gain can be expressed using the equation Av = โ€“ Rf/R1. Negative sign implies that the output signal is negated. The circuit diagram of a basic inverting amplifier using op-amp is shown below. The input and output waveforms of an inverting amplifier using op-amp is shown below. The graph is drawn assuming that the gain (Av) of the amplifier is 2 and the input signal is a sine wave. It is clear from the graph that the output is twice in magnitude when compared to the input (Vout = Av x Vin) and phase opposite to the input. Practical inverting amplifier using 741. A simple practical inverting amplifier using 741 IC is shown below. uA 741 is a high performance and of course the most popular operational amplifier. It can be used in a verity of applications like integrator, Differentiator, voltage follower, amplifier etc. uA 741 has a wide supply voltage range (+/-22V DC) and has a high open loop gain. The IC has an integrated compensation network for improving stability and has short circuit protection. Signal to be amplified is applied to the inverting pi (pin2) of the IC. Non inverting pin (pin3) is connected to ground. R1 is the input resistor and Rf is the feedback resistor. Rf and R1 together sets the gain of the amplifier. With the used values of R1 and Rf the gain will be 10

10K/1K = 10). RL is the load resistor and the amplified signal will be available across it. POT R2 can be used for nullifying the output offset voltage. If you are planning to assemble the circuit, the power supply must be well regulated and filtered. Noise from the power supply can adversely affect the performance of the circuit. When assembling on PCB it is recommended to mount the IC on the board using an IC base. ๏‚ท For Gain 1 R 1 =10K , R 2 = 10K [๐‘‰๐‘œ๐‘ข๐‘ก = โˆ’ ๐‘… 2 ๐‘… 1

๐‘‰๐‘–๐‘›]

VIN VOUT

0 V

0.1V

0.3V

0.5V

0.7V

0.9V

Formula- V 0 = ( 1 + ๐‘… 2 ๐‘… 1

)VIN

R*=

๐‘… 1 ๐‘… 2 ๐‘… 1 +๐‘… 2 For Gain 2 R 1 =10K , R 2 =10K VIN VOUT 0V 0.1V 0.3V 0.5V 0.7V 0.9V For Gain 10 R 1 =10K , R 2 =90K VIN VOUT 0V 0.1V 0.3V 0.5V 0.7V 0.9V Procedure:

  1. Connect the circuit for inverting, non inverting amplifier on a breadboard.
  2. Connect the input terminal of the op-amp to function generator and output terminal to CRO.
  3. Feed input from function generator and observe the output on CRO.
  4. Draw the input and output waveforms on graph paper. VIVA VOICE QUESTIONS:
  1. Define an integrated circuit and classify them.
  2. What is an op-amp and what are its types?
  3. How to define the symbol of op-amp?
  4. What are the various terminals of op-amp 741 IC?
  5. What is the operating voltage range of IC 741?

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