its simulation of signal of op amp as comparator

1. To Simulate Signal Processing
Circuit Based on OP-Amp and
Sensor
Guide:
ASSO.Prof. Dr.Dhyey Raval
HOD:
Prof.Ajit.Pujara
1
Prepared by:
GAJJAR SHRAVAN A. (130810108004)

2. NO DESCRIPTION
1 Introduction
2 Operational Amplifiers
3 Signal Processing circuits based on op-amp
4 SIMULATION OF OPAMP AS COMPARATOR
5 Results And Observation
6 Conclusion
INDEX

3. 1.Introduction
-Signal processing circuits are used to process the output signal from sensors of
a measurement system to be suitable for the next stage of operation
-The function of the signal conditioning circuits include the following items:
Signal amplification (opamp), Filtering (opamp), Interfacing with P (ADC),
Protection (Zener & photo isolation), Linearization, Current – voltage change
circuits, resistance change circuits (Wheatstone bridge), error compensation.

4. 2.Operational Amplifiers
Operational amplifiers are the basic element of many signal
conditioning modules
Generally the opamp has the following properties:
Gain: being of the order greater than 100000, ideally =
infinite
Input impedance: ideally infinite
output impedance: ideally zero; practical values 20-100

5. Voltage Comparator
– digitizeinput
Non-Inverting Amp Inverting Amp
Voltage Follower

6. 3. Signal Processing circuits based on op-amp
If the voltage
applied to v1 is
greater than V2 then
the output is
constant voltage
equal to (-10V) if
(V2>V1) then the
output is constant
voltage =(+10V).
This can be used in
the following
example:
The output indicates which V2). When used with no feedback
connection of the two voltages is high (V1 or V2)

7. The circuit is designed to control temperature with a certain range. When
the temp. is below certain value, the thermistor R1 is more than R2 and
the bridge is out of balance, it gives an output at its lower saturation limit
which keeps the transistor OFF. When temperature rises and R1 falls the
opamp switch to +ive saturation value and switch the transistor ON

8. 4.SIMULATION OF OPAMP AS COMPARATOR COMPARATOR

9. 5.Result And Observation

10. 6.Conclusion
After performing this simulation we conclude that operation
amplifier can work as comparator and it sense the temperature
and start rotating fan based on reference voltage applied on
non-inverting pin of op-amp.