COLLEGE OF ENGINEERING

Sir.C.V.Raman Nagar, Tirunelveli-12

Department of Electronics and Communication Engineering

Subject Code: EC-76

“ELECTRONIC SYSTEM DESIGN LAB”

Name Reg No Branch Year & Semester

: …………………………………… : …………………………………… : …………………………………… : ……………………………………

EC-76 ESD LAB MANUAL

LIST OF EXPERIMENTS

Exp.No 1 2 3 4

Name of the experiment DESIGN OF AN INSTRUMENTATION AMPLIFIER

Page No

DESIGN OF AC/DC VOLTAGE REGULATOR USING SCR DESIGN OF PROCESS CONTROL TIMER i) DESIGN OF AM MODULATOR AND DEMODULATOR ii) DESIGN OF FM MODULATOR AND DEMODULATOR

5 6 7 8 9 10

DESIGN OF WIRELESS DATA MODEM PCB LAYOUT DESIGN USING CAD TOOL MICROCONTROLLER BASED SYSTEMS DESIGN DSP BASED SYSTEM DESIGN PSUEDO RANDOM SEQUENCE GENERATOR ARITHMETIC LOGIC UNIT DESIGN

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EC-76 ESD LAB MANUAL

INDEX

EX.No DATE NAME OF EXPERIMENT PAGE No MARKS INITIAL

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EC-76 ESD LAB MANUAL

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EC-76 ESD LAB MANUAL

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EC-76 ESD LAB MANUAL Ex. No.1 DESIGN OF AN INSTRUMENTATION AMPLIFIER

AIM: To design, construct and test an instrumentation amplifier using IC 741 and vary its gain from 1 to 100. APPARATUS REQUIRED: S.No 1 2 Name of the Apparatus Operational Amplifier Resistor Range IC 741 10k 1k 150 Quantity 4 10 4 1 1

3

DRB

4 5 6 7

Bread Board &Connecting wires Dual Power Supply Rheostat Ammeter

As required 1 1 1

(0-100) (0-250)µA

8

Multimeter

1

THEORY: INSTUMENTATION AMPLIFIER: Instrumentation amplifier is generally required in any measurement system using electrical transducers to enhance signal levels often in low voltage less than mV. Also it is required to provide impedance matching and isolation. When the desired input rides over a common mode signal special amplifier are needed so that difference signals get amplified to an acceptable level while the common mode signals get attenuated. The physical quantities can be converted into electrical quantities by using transducer. The output of the transducer needs to be amplified to get the meter readings. This amplification is done by using instrumentation amplifier. The output of instrumentation amplifier drives of indicator or display system. The important features of an instrumentation amplifier are high gain accuracy, high CMRR, high gain stability with low temperature co-efficient, low dc offset, low output impedance. Low input impedance may load the signal source heavily. Therefore high resistance buffer is used preceding each input to avoid this loading effect. For V1 =V2 under common mode condition. If V’2 =V2 and V’1 =V1 both the operational amplifiers act as voltage follower. If V1 V2 the circuit has differential gain by the formula VO/ (V2-V1)=1+(2R/R‘).

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EC-76 ESD LAB MANUAL CIRCUIT DIAGRAM: BRIDGE CIRCUIT:

INSTRUMENTATION AMPLIFIER:

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EC-76 ESD LAB MANUAL DESIGN: Output voltage

VO = (1 + ( 2R / R‘)) (V2 -V1)

Differential gain Ad = VO / (V2 - V1) = 1 + (2R / R‘) Choose R = 10kΩ For Ad max = 100 100 = 1 + (20k/R‘) R’ = 20K --------99 R’ max = 200Ω. For Ad min = 10 10 = 1 + (20k/R‘) R’ min = 2.2KΩ. IL = I1+I2 I1 = (V-(V0/2)) / R I2 = (V0-(V0/2)) / R IL = (V-(V0/2) + (V0-(V0/2)) / R = (V-V0+V0) / R = V/R IL is independent of RL. If R is constant then IL V PROCEDURE: 1. The connections are made as per the circuit diagram. 2. The bridge circuit was balanced by varying 100Ω Rheostat. 3. The output voltage V1 and V2 of balanced circuit were given as input to the op-amp A1 and A2. 4. Varying the resistance R1 the bridge circuit the voltage V1 and V2 were varied. 5. Varying the R’ the output voltage was measured then the differential gain was calculated using formula, =20 log (VO/(V2 -V1)).

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