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==== Input impedance ==== The input stage with Q1 and Q3 is similar to an emitter-coupled pair (long-tailed pair), with Q2 and Q4 adding some degenerating impedance. The input impedance is relatively high because of the small current through Q1-Q4. A typical 741 op amp has a differential input impedance of about 2 MΞ©.<ref name="NS LM741">National Semiconductor LM741 data sheet</ref> The common mode input impedance is even higher, as the input stage works at an essentially constant current.
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