Switchable Low Voltage Current Source
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-01
Previously available low voltage current sources of either the common- emitter or resistor-emitter-type designs contain certain inherent disadvantages in high density logic chip applications, such as pipe sensitivity, tight device Vbe tracking requirements, and lack of switchability. This article describes a switchable low voltage current source which overcomes these disadvantages, saves on device count and offers improved performance. Fig.1 and 2 illustrate, respectively, generic current sources of the common emitter and the resistor emitter types.