Current Mirror

*The current values in both transistors collectors are almost the same; * This value is defined as: I = (VCC - VBE)/R *IC1 ~= IC2 = IR = I *It is used as an active load in place of the emitter resistor (RE) and/or collector resistor (RC) of a dif-amp; *A current source is almost an open circuit to AC signals (high AC impedance).