Patent ID: 6570436
Filing Date: 2003-05-27
Classification: G05F

Abstract:
A current reference circuit comprising:a first MOS transistor having gate, drain, and source, wherein a gate has a voltage value; a second MOS transistor having gate, drain, and source, wherein said second MOS transistor is of the same size and type as said first MOS transistor, wherein said source is coupled to said first MOS transistor source, and wherein a delta voltage value is added to the gate voltage, a means of forcing a voltage value to said drain of said first MOS transistor and to said drain of said second MOS transistor such that said first MOS transistor and said second MOS transistor conduct drain currents in the linear mode; and a means of subtracting said first MOS transistor drain current from said second MOS transistor drain current to thereby create a current reference value wherein said current reference value does not depend upon the threshold voltage of said first and second MOS transistors.