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I_O = I_C2.
* Select the reference current, I_R1, assumed to be larger than the output current, probably considerably larger (that is the purpose of the circuit).
* Determine the input collector current of Q₁, I_C1:
*:
* Determine the base voltage V_BE1 using the Shockley diode law
*:
: where I_S is a device parameter sometimes called the scale current.
: The value of base voltage also sets the

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