9-Final
3
The University Of Asia Pacific Department of Computer Science & Engineering ECE 202 Experiment No: 08 Name of the Experiment :Elementary designs with Op-amps. Objective: To experiment with a general purpose op-amp to design an adder . Theory: Op amp is a voltage controlled device in which the out put voltage is a function of the input voltage.The gain is stabilised by providing a negative feedback from the output to the input .There are two inputs in the op-amp - 1.non-inverting 2.inverting .The gain is controlled by the ratio of the feeedback resister to input resister ratioas given by – a. Av= -Rf/Ri b. Av=(1+Rf/Ri) Since Vo=Av*Vi an op amp can be easily configured as a linear adder . We will see two such circuits which can add multiple input voltages and output the voltage as the summation of the input voltages. The gain is controlled by the ratio of the feeedback resister to input resister ratioas given by – c. Av= -Rf/Ri d. Av=(1+Rf/Ri) Since Vo=Av(+)*V1 +Av(-)*V2 an op amp can be easily configured as a linear subtractor .We will see such circuits which can subtract input voltages and output the voltage as the subtracted form of the input voltages Equipment: Resistors 10K ,50k. Trainer board Multimeter Circuit Diagram :
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Transcript of 9-Final
The University Of Asia PacificDepartment of Computer Science & Engineering
ECE 202
Experiment No: 08
Name of the Experiment :Elementary designs with Op-amps.
Objective: To experiment with a general purpose op-amp to design an adder .
Theory:Op amp is a voltage controlled device in which the out put voltage is a function of the input voltage.The gain is stabilised by providing a negative feedback from the output to the input .There are two inputs in the op-amp - 1.non-inverting 2.inverting .The gain is controlled by the ratio of the feeedback resister to input resister ratioas given by –a. Av= -Rf/Rib. Av=(1+Rf/Ri)Since Vo=Av*Vi an op amp can be easily configured as a linear adder .We will see two such circuits which can add multiple input voltages and output the voltage as the summation of the input voltages.The gain is controlled by the ratio of the feeedback resister to input resister ratioas given by –c. Av= -Rf/Rid. Av=(1+Rf/Ri)Since Vo=Av(+)*V1 +Av(-)*V2 an op amp can be easily configured as a linear subtractor .We will see such circuits which can subtract input voltages and output the voltage as the subtracted form of the input voltages
Equipment: Resistors 10K ,50k. Trainer board Multimeter
Circuit Diagram :
Procedure :1. Connect the circuit as in the figure 1.2. Set Rf=10k & Ri=10k.3. Adjust the levels of the input voltage sources (refer to your teacher ).4. Connect the power supply and take the readings according to the table 1.1..5. Connect the circuit as in the figure 2.6. Repeat step 2-37. Connect the power supply and take the readings according to the table 1.2.
(Submit the report part at the Lab)
Course No: ECE 202 Expt. No: 08Registration No: Semester: Roll No: Date:
Report:1: Verify the adder circuit .
Table 1.1Rf=10k ,Ri=10k
V1 (Volt) V2 (Volt) Vout (Volt)(Using Multimeter)
Vout (Volt)(V1+V2)
5 15 25 35 45 5
Compare the two values of Vout.
2: Verify the Subtractor circuit .Table 1.2
Rf=10k ,Ri=10k
V1 (Volt) V2 (Volt) Vout (Volt)(Using Multimeter)
Vout (Volt)=Av(+) V1+
Av(-)V2
5 15 25 35 45 5
Av(-) = -Rf/Ri , Av(+)=(1+Rf/Ri)
Compare the two values of Vout.
3. Design and draw an Op –Amp adder circuit such that,
Vout = 4 (V1+V2) – 6V3+ (3V4)dtAssume for all the designs the value of Ri = 1K.
