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Instrumentation Amplifier: EXP - NO: 03

1. The document describes an experiment to construct a 3 op-amp instrumentation amplifier and test its common mode rejection ratio (CMRR). Resistors and op-amps are used to build the amplifier circuit according to a provided diagram. 2. The procedure involves giving input voltages V1 and V2 to the circuit, measuring the output voltage Vo for common and differential mode operations, and calculating the common mode and differential mode gains to determine the CMRR. 3. Tabulations are included to record the input voltages, output voltages, and calculated gains and CMRR for analysis and determining the performance of the constructed instrumentation amplifier.

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Naveen G
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673 views4 pages

Instrumentation Amplifier: EXP - NO: 03

1. The document describes an experiment to construct a 3 op-amp instrumentation amplifier and test its common mode rejection ratio (CMRR). Resistors and op-amps are used to build the amplifier circuit according to a provided diagram. 2. The procedure involves giving input voltages V1 and V2 to the circuit, measuring the output voltage Vo for common and differential mode operations, and calculating the common mode and differential mode gains to determine the CMRR. 3. Tabulations are included to record the input voltages, output voltages, and calculated gains and CMRR for analysis and determining the performance of the constructed instrumentation amplifier.

Uploaded by

Naveen G
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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EXP.

NO: 03 INSTRUMENTATION AMPLIFIER

AIM:
To construct and test the CMRR (Common Mode Rejection Ratio) of a 3 op-amp
instrumentation amplifier using op-amp IC741.

APPARATUS REQUIRED:

S.NO COMPONENTS / EQUIPMENT RANGE QUANTITY


1. IC 741 03
1KΩ. 06
2. RESISTORS
22KΩ 01
3. DIGITAL TRAINER KIT --- 01
4. SIGNAL GENERATOR (0-3)MHz 02
5. CATHODE RAY OSCILLOSCOPE (0-30)MHz 01
6. CONNECTING WIRES --- FEW

PROCEDURE:
1. Select the entire resistor with same value of resistance R. Let RG be the gain varying
resistor with different values of resistance. For simplicity, let RG be a constant value.
2. Connect the circuit as shown in the circuit diagram.
3. Give the input V1 & V2 to the non-inverting terminals of first & second
Op-amp respectively.
4. By varying the value of RG, measure the output voltage for common mode and
differential mode operation. Since RG is selected as constant value, provide different
input value of V1 & V2.
5. Calculate the differential mode gain Ad and common mode gain Ac to calculate the

CMRR=20 log Ad
CMRR as Ac.

1
CIRCUIT DIAGRAM:

+15v

3 7
+ Rf=1K

2
- IC 741 6
4 +15v
R2=1K
-15v
R1=1K2 - 7
IC 741
6
+
RG=22K
R1=1K
3 + 4

V1
-15v
R2=1K
- +

+15v R1=1K V
-
2 - 7
IC 741
6
+ 3 + 4
V2
-15v
-

TABULATION:

COMMON MODE GAIN CALCULATION - AC


V o

RG V1 V2 Vo Ac =
S.No V □
(KΩ) (Volts) (Volts) (Volts) V
1 2
2
1.

2.

3.

4.

5.

2
DIFFERENTIAL MODE GAIN - AD & CMRR CALCULATION.

V1 V2 Vo
Ad =
S.NoRG (KΩ)(Volts) (Volts) (Volts)
1.
2.

3.

4.

RESULT:
Thus a 3 op-amp instrumentation amplifier was constructed and CMRR is
tested using op-amp IC 741.

3
4

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