Current Mirror Circuit Diagram. In the left side the current mirror circuit using 2n2222 bjt is shown where two identical transistor pair is used. Conceptually an ideal current mirror is simply an ideal inverting current amplifier that reverses the.
Conceptually an ideal current mirror is simply an ideal inverting current amplifier that reverses the. The current being copied can be and sometimes is a varying signal current. The current mirror is used to provide bias currents and active loads to circuits.
Reality isn t quite so simple as you are about to see.
The current being copied can be and sometimes is a varying signal current. The base connections of both transistors are then linked as are the emitters which are also taken to ground. A current mirror is a circuit designed to copy a current through one active device by controlling the current in another active device of a circuit keeping the output current constant regardless of loading. The simple two transistor implementation of the current mirror is based on the fundamental relationship that two equal size transistors at the same temperature with the same v gs for a mos or v be for a bjt have the same drain or collector current.
