I want to solve the following problem,
Q. Assuming the op-amp to be ideal, what is the voltage gain of the amp. Shown below ?
My soln. The pot. at inv. terminal = pot. at noninv. terminal = 0 (due to the virtual ground conditian)
Then KCL at the node a gives,
(V1-0)/R1 = (0-Vo)/R2 (as the op-amp is ideal no current will flow inside it)
So, Vo/V1 = voltage gain = (R2 / R1)
But the correct ans. is (R2 || R3) / R1 (I found this in more than five books but none have it solved)
Please help me and please show me the step by step solution.
Q. Assuming the op-amp to be ideal, what is the voltage gain of the amp. Shown below ?
My soln. The pot. at inv. terminal = pot. at noninv. terminal = 0 (due to the virtual ground conditian)
Then KCL at the node a gives,
(V1-0)/R1 = (0-Vo)/R2 (as the op-amp is ideal no current will flow inside it)
So, Vo/V1 = voltage gain = (R2 / R1)
But the correct ans. is (R2 || R3) / R1 (I found this in more than five books but none have it solved)
Please help me and please show me the step by step solution.
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