The AD706 is a dual, low power, bipolar op amp that has the
low input bias current of a BiFET amplifier, but which offers a
significantly lower IB drift over temperature. It utilizes superbeta
bipolar input transistors to achieve picoampere input bias cur-
rent levels (similar to FET input amplifiers at room tempera-
ture), while its IB typically only increases by 5× at 125°C (unlike
a BiFET amp, for which IB doubles every 10°C for a 1000×
increase at 125°C). The AD706 also achieves the microvolt
offset voltage and low noise characteristics of a precision bipolar
input amplifier.