Improved Current Mirror for Low Beta Transistors
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
This current mirror allows very long strings to be built with a large degree of accuracy, even with low-Beta devices. The figure below shows the circuit for a PNP configuration. Transistors Q1, Q2, and Qn represent current sources, which are a mirror of the reference current IREF.