1. Differentiator and Integrator Circuit
Section 8.2

2. Integrator Circuit

3. LM741CN

4. R5 At DC, the op-amp is not able to provide feedback.
Thus V- is not equal to V+.
A resistor should be added in parallel of C1 so as to provide
feedback at DC.

5. Select value of R5
This term should be minimized.

6. Choice of R5
R5=330 Kohms
C1=92 nF
R5=1 Kohms
C1=92 nF

7. DC Offset Without Offset Nulling: Vout=11 mV when Vin=0.
With Offset Nulling: Vout=2 mV when Vin=0

8. Input Bias Current

9. Compensate for Input Bias Current
Choose R7 so that R7=R6 ||R5

10. Vout Comparison Analytical Experiment R1 22 Kohms dT 0.5 mS C1 10 nFdV
2.72 V
Vin
1.32 V
dVout/dt
-6V/mS
dVout/dT
5.44 V/mS

11. Sensitivity of C1
2nF
1nF
92 nF

12. Differentiator

13. Eliminate Output Offset Voltage Due to Input Bias Current

14. Avoid Excessive Current Through R8f
1000 C2
2nF
1/(sC2)
79.60 KOhms R8
1 KOhms
(Assume C2 is
initially uncharged)

15. Measurement Vs. Analytical Results
dVin
2.44 V dT
0.5 mS
R10
10 Kohms C2
2 nF
Vout (calculated)
-98 mV
Vout (meas)
-96 mV