The output voltage of the modified ISFETs immersed in
double-distilled water were measured with a source follower
type ISFET amplifier. This system allowed the
source voltage Ž . V to be measured while the drain current s
N. Jaffrezic-Renault et al.rSensors and Actuators B 59 1999 154–164 ( ) 157
Ž. Ž . Ž Id dd and the drain voltage V remained constant. V s1
V, I s100 mA .. V was directly plotted on a recorder.