When 100 V and 20 V are applied to the non inverting and the inverting terminal of open loop an opamp, the output obtained is 80600 V.  If the voltage at the inverting terminal is changed to 40 V, then the output voltage is 60700 V.  What will be the differential gain and common mode gain of the opamp?

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter12: Power System Controls
Section: Chapter Questions
Problem 12.3P
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When 100 V and 20 V are applied to the non inverting and the inverting terminal of open loop an opamp, the output obtained is 80600 V. 

If the voltage at the inverting terminal is changed to 40 V, then the output voltage is 60700 V. 

What will be the differential gain and common mode gain of the opamp?

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