Course Model:
Core Concepts:
ESD DesEx 2023 ESD Block 2 Sheet
In a longtail pair, both outputs are equal in current,
All of the errors we are calculating for are in the blue section of this circuit, as the gain is 100x the rest of the circuit and therefore so is the error
And here
As the input current into both Q1 and Q2 isnt actually 0, this would potentially lead to problems. however because of the design of the longtail pair, it turns out which practically means as they both increase at the same rate we can treat the input impedance of the circuit as infinite
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