I am using a current mirror to control current in a number of locations on a circuit board. I have tested various types of transistors and found that the variation between transistors from the same lot is minimal, so that is not a concern. What is a concern is the change in current with temperature, as there may be differences in temperature on different locations across the board. I've found that the variation in this regard from one transistor type to another is quite significant. I need to know what transistor characteristics to look for for a transistor with minimal amount of thermal drift (in an NPN current mirror application).
Thanks,
BS
Thanks,
BS