The compliance range for operating voltage extends from a minimum of 4 V (both circuits) to a maximum that is slightly lower for the Figure 1a circuit (90 V), because of its different output device.

Part 1 of this article defines and describes the designs that carry these low currents, explains the problems that arise when you design these circuits, and examines the application of shielding and ...

Contributing editor, Bob Pease, explains how to design several different circuits for limiting currents as high as 300 mA using an LM317, LM334N, IRF640 or IRF740.

1. In the circuit for the 1 mA two-terminal current source, the leftmost PNP transistor (Q4) is a "bolt-on" to harvest the approximately 0 temperature-coefficient current in the left leg (a).

Smaller, Faster Integrated Circuits Created By Using Computer-aided Design Software Date: December 20, 2007 Source: University of California - Los Angeles ...

“If you design two transistors to have different source-gate overlaps,” he continued, “you get two different temperature coefficients.” If these two different transistors are made into a current ...