Widlar current source/Definition

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https://en.citizendium.org/wiki/index.php?title=Widlar_current_source/Definition&printable=yes
A definition or brief description of Widlar current source.

a modification of the basic two-transistor current mirror that incorporates an emitter degeneration resistor for only the output transistor, enabling the current source to generate low currents using only moderate resistor values and therefore a small area

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