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Why is “input resistance” not described in the operational amplifier data sheets?

April 26, 2017amplifier Data operational sheets

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Why is “input resistance” not described in the operational amplifier data sheets?

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A1 The input resistance (Ω) can be calculated as R = V/I per unit voltage (1 V) from the input bias current (A) described in the electrical specifications in the data sheets. An example using the uPC151 is shown MIN.TYP.MAX. Unit Input bias current-80500nA Input resistance 212.