Why input resistance not described in an operational amplifier sheet?
Why is "input resistance" not described in the operational amplifier data sheets?
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 ||- ||80 ||500 ||nA |
|Input resistance ||2 ||12.5 ||- ||MΩ |Suitable Products
|Operational Amplifiers |
|USB2.0 Host/Peripheral Controller |