PMOS current mirror with cascaded PMOS transistors and zero voltage gate threshold transistor

摘要

A current mirror circuit is provided that includes first and second transistors operating to control an output current that is directly related to a reference current. The circuit also includes a third transistor in cascade with the second transistor, wherein gates of all the transistors are connected together and the second transistor has a drain source voltage that is approximately equal to a drain source voltage of the first transistor, and wherein the third transistor has an approximately zero threshold voltage.