2.105 An op amp intended for operation with a closed-loop gain of –100 V/V uses resistors of 10 kΩ and 1 MΩ with a bias-current-compensation resistor R3. Assuming an ideal voltage source at the input, what should the value of R3 be? With input grounded, for one particular op amp the output offset voltage is found to be +0.30 V. Estimate the input offset current assuming zero input offset voltage. In this case, if we know the input offset current is one-tenth the bias current what value of R3 will result in zero output offset voltage?
2.105 An op amp intended for operation with a closed-loop gain of –100 V/V uses resistors of 10 kΩ and 1 MΩ with a bias-current-compensation resistor R3. Assuming an ideal voltage source at the input, what should the value of R3 be? With input grounded, for one particular op amp the output offset voltage is found to be +0.30 V. Estimate the input offset current assuming zero input offset voltage. In this case, if we know the input offset current is one-tenth the bias current what value of R3 will result in zero output offset voltage?
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