Simple current mirror with two transistor circuit is used as active load in Op amp. Please see Op amp UA 741C internal structure( I have mentioned Op amp to avoid diversion from statement. let us discuss about the same).
please constant current, Wildar and wilson current sources are not expected in the discussion.
yes Mr. Cyril.. You mean it..The same circuit I am interested in...
Dear Vaibhav,
To answer this question, you do not need to see any current mirror here; simply think of its right part (Q1) as of a common emitter stage... or even as of a humble transistor driven by a constant base-emitter voltage...
Then, looking into the Q1's collector, you will see both the resistances - the low static (DC, ohmic), and the high dynamic (AC, differential). They may be illustrated very vell on the transistor output characteristic.
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