Patent ID: 6483372
Filing Date: 2002-11-19
Classification: G05F

Abstract:
A low temperature coefficient (TC) voltage output circuit, comprising:a base circuit which produces a preliminary output voltage (Vo) having a TC of one polarity, and a compensation circuit connected to compensate the base circuit's Vo TC to yield a compensated Vo having a lower TC than said preliminary Vo TC, said compensation circuit comprising first and second current sources having different TCs and connected to provide said Vo TC compensation, said compensation circuit further comprising a voltage drop circuit connected to receive a current which varies with the differential between said current sources, and to produce a compensation voltage which cooperates with said base circuit Vo to yield said compensated Vo, wherein said current sources provide a current to said voltage drop circuit that causes said compensation voltage to have a TC substantially equal in absolute value, but of opposite polarity, to said preliminary Vo TC.