Virtual Simulation



Lab Report



Aim:


To design and study the open loop gain from Inverting Amplifier circuit.

Components required:


   Function generator, CRO, Regulated Power supply, resistor, capacitor, 741 IC, connecting wires.


Vlab Specifications Taken:


Inverting Amplifier circuit design has been implemented on the virtual breadboard using following specifications:

  • Power Supply: +10v and -10v
  • Function generator: Selected wave with following specifications:
Frequency = 50Hz Amplitude: 750mV, 850mV, 900mV, 950mV, 1V, 2V. Duty cycle = 50%
  • Resistor R2: 10.38K
  • Resistor R1: 1.369K



Theory:


An inverting-amplifier circuit is built by grounding the positive input of the operational amplifier and connecting resistors R1 and R2, called the feedback networks, between the inverting input and the signal source and amplifier output node, respectively. With assumption that reverse-transfer parameter is negligibly small, open-circuit voltage gain Av, input resistance Zin and output resistance Zo can be calculated.



Inverting Amplifier configuration of an op-amp


Procedure:


  1. Connect the circuit as shown in the circuit diagram.
  2. Give the input signal as specified.
  3. Switch on the power supply.
  4. Note down the outputs from the CRO
  5. Draw the necessary waveforms on the graph sheet.


Observations:


  1. Observe the output waveform from CRO. An inverted and amplified waveform will be observed.
  2. Measure the input and output voltage from the input and output waveform in the CRO.
  3. Calculate

  4. Compare the theoretical voltage gain from the above equation with the experimental value obtained by dividing output voltage by input voltages observed.
  5. Observe outputs of the inverting amplifier circuit using different input waveforms.


VLab Observations Obtained:


For example, a case has been taken and the required parameters values is being noted down below:
  1. Input Voltage: 1.73VV
  2. Frequency: 50Hz
  3. Output Voltage: 11.9V


Calculations:



    1.Calculate experimentally observed voltage gain Av using observed Vo& Vin from CRO.



      2.Theoretically voltage gain is given by:





Result:


Hence the opamp can configure as inverting amplifier circuit as observed from the output waveforms.

Precautions:


  1. Connections should be verified before clicking run button.
  2. The resistance to be chosen should be in Kohm range.
  3. Best performance is being obtained within 50Hz to 1Mhz.


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