Patent ID: 6046578
Filing Date: 2000-04-04
Classification: G05F

Abstract:
A circuit for producing a reference voltage, comprising:a first circuit device for producing a first voltage having a negative temperature coefficient;a second circuit device for producing a difference voltage from a second voltage and a third voltage;the second voltage and the third voltage each derived from forward voltages across corresponding pn junctions and the difference voltage subject to a positive temperature coefficient;the first voltage from said first circuit device and the difference voltage from said second circuit device added together to form a reference voltage to be tapped off;said first circuit device deriving the first voltage from a summed voltage formed by at least two forward voltages across corresponding pn junctions; andsaid second circuit device deriving the second voltage and the third voltage from respective first and second summed voltages each formed by at least two forward voltages across corresponding pn junctions, and said second circuit device producing the difference voltage from the second and third voltages.