Integrated circuit current mirror

摘要

An integrated current mirror circuit in which a compensation transistor is added in each stage of the mirror to compensate for the base-substrate leakage currents of the other transistors in the mirror circuit and to keep the circuit operative even at high temperatures and low current levels. Each compensation transistor is matched with the other transistors in its stage and has its collector-emitter circuit connected between a voltage source terminal and the common base connection of the other transistors. The base of each compensation transistor is unconnected to the remainder of the circuit but exhibits a base-substrate leakage current which is employed in the compensation scheme.