A composite voltage reference with improved temperature stability includes
a monolithic voltage reference integrated circuit ("IC"). The voltage
reference IC has an internal voltage reference, an internal OpAmp circuit
including scaling resistors, a monolithic voltage reference IC
temperature coefficient, and a user accessible input to vary a monolithic
voltage reference IC output voltage. A second voltage reference has a
second voltage reference temperature coefficient lower than the
monolithic voltage reference IC temperature coefficient. The second
voltage reference is electrically coupled to the user accessible input
wherein the temperature coefficient of the composite circuit of the
monolithic voltage reference IC and the second voltage reference is
improved over the monolithic voltage reference IC temperature
coefficient.