The low input current noise is important when high source impedance are driving the input of the Op Amp. Look at the datasheet. Example page 19 of the OPA1642: https://www.ti.com/lit/gpn/opa1642
Low input current noise is important when a high source impedance is driving the input of the Op Amp. Look at the datasheet. Example page 18, 19 & 20 of the OPA1642: https://www.ti.com/lit/gpn/opa1642.
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