Wide-Temperature-Range Current-Source Generator
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
A technique is described to overcome the failure of current-source generators to compensate at low temperatures due to the limited power supply differential available. With previous compensated current- source emitter-follower (CCSEF) reference current-source generators, (Image Omitted) the generator compensated to mid-swing as a reference. The new design regulates to an attenuated value of reference to avoid driving the differential amplifier into the saturated region. The circuit schematic of the previous reference current source of Vcs is given in Fig. 1. This is to be operated at Vcc = 1.35 V, Vee = 1.7 V and Vr = 0 V nominally. For worst-case environmental conditions Vcc approaches 1.188 V, and Vr approaches 0.09 V.