In an ideal Operational Amplifier these two current are exactly identical but as mentioned before due to the limitations of the manufacturing technologies these current are not exactly equal in the practical Operational Amplifier which leads to problems in the actual operation of the Operational Amplifier based circuits. The current at the Inverting terminal is represented by Ib1 and at Non-Inverting is represented by Ib2. These current are represented by the current sources shown in the following image which can be considered as the equivalent circuit for the Operational Amplifier showing the input bias currents: This input bias current is applied at both the inverting and non-inverting terminal of the Operational Amplifier. This input bias current is necessary for the proper operation of the Operational Amplifier. That is one of the important characteristics of the Operational Amplifier as I mentioned in my posts is its high input impedance which makes it important in designing the signal conditioning circuit as it minimizes the loading effect on the input signal source by draining as low current as possible so the point I am trying to make through this discussion is that the input bias current is different from the current that should be minimized in order to avoid loading effect. It is important to note here that this input bias current is independent and different from that that we discuss while considering the high input impedance of the Operational Amplifier. In order for the Operational Amplifier to operate properly it should be supplied with some input bias current. Let us first discuss about the input bias current of the Operational Amplifier.
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