EE6311 LDIC LAB Manual, Linear Digital Integrated Circuits Laboratory Manual – EEE 3rd SEM Anna University


EE6311 LDIC LAB Manual

Anna University Regulation 2013 EEE EE6311 LDIC Lab Manual for all experiments is provided below. Download link for EEE 3rd SEM EE6311 Linear Digital Integrated Circuits Laboratory Manual is listed down for students to make perfect utilization and score maximum marks with our study materials.

Anna University Regulation 2013 EEE 3rd SEM EE6311 LDIC LAB-Linear Digital Integrated Circuits Laboratory Manual



To design an inverting amplifier, non-inverting amplifier and voltage follower for the given specifications using Op-Amp IC 741


1. Ramakant A.Gayakward, ‘Op-amps and Linear Integrated Circuits’, IV edition, Pearson Education, 2003 / PHI. (2000).

2. D.Roy Choudhary, Sheil B.Jani, ‘Linear Integrated Circuits’, II edition, New Age, 2003.


Sl. No.   Name of the Apparatus   Range   Quantity

1             Function Generator        20 MHz       1

2                   CRO                             30 MHz       1

3              Dual RPS                         0 – 30 V      1

4             Op-Amp                              IC 741        1

5             Bread Board                                           1

6              Resistors                        As required

7             Connecting wires &       As required




Summing amplifier is a type operational amplifier circuit which can be used to sum signals. The sum of the input signal is amplified by a certain factor and made available at the output .Any number of input signal can be summed using an op-amp. The circuit shown is a three input summing amplifier in the inverting mode.

In the circuit, the input signals Va, Vb, Vc are applied to the inverting input of the opamp through input resistors Ra, Rb, Rc. Any number of input signals can be applied to the inverting input in the above manner. Rf is the feedback resistor. Non inverting input of the opamp is grounded using resistor Rm. RL is the load resistor.


A non inverting summing amplifier circuit with three inputs is shown above. The voltage inputs Va, Vb and Vc are applied to non inverting input of the op-amp. Rf is the feedback resistor. The output voltage of the circuit is governed by the equation;

Vo = (1+ (Rf/R1)) (( Va+Vb+Vc)/3)


A unity gain buffer amplifier may be constructed by applying a full series negative feedback (Fig. 2) to an op-amp simply by connecting its output to its inverting input, and connecting the signal source to the non-inverting input (Fig. 3). In this configuration, the entire output voltage (β = 1 in Fig. 2) is placed contrary and in series with the input voltage. Thus the two voltages are subtracted according to Kirchhoff’s voltage law (KVL) and their difference is applied to the op-amp differential input. This connection forces the op-amp to adjust its output voltage simply equal to the input voltage (Vout follows Vin so the circuit is named op-amp voltage follower).


Output voltage will be saturated if it exceeds ± 15V.


1. Connections are given as per the circuit diagram.

2. + Vcc and – Vcc supply is given to the power supply terminal of the Op-Amp IC.

3. By adjusting the amplitude and frequency knobs of the function generator, appropriate input voltage is applied to the non – inverting input terminal of the OpAmp.

4. The output voltage is obtained in the CRO and the input and output voltage waveforms are plotted in a graph sheet.

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