Offset-voltage temperature-coefficient in dual m.o.s.f.e.t. source followers

A technique is given for predicting the approximate temperature coefficient of offset voltage of a differential m.o.s.f.e.t. source-follower arrangement incorporated in a unity-gain buffer amplifier set up for zero offset at room temperature. The prediction is dependent on only one measurement, using a bridge-circuit technique, and takes account of possible power-law differences in the nominally matched dual m.o.s.f.e.t.s.