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Ultra-low-power differential ISFET/REFET readout circuit
Author(s)
Thanachayanont, Apinunt
Date Issued
January 1, 2009
Type
Article
Abstract
A novel ultra-low-power readout circuit for a pH-sensitive ion-sensitive field-effect transistor (ISFET) is proposed. It uses an ISFET/reference FET (REFET) differential pair operating in weak-inversion and a simple current-mode metal-oxide semiconductor FET (MOSFET) translinear circuit. Simulation results verify that the circuit operates with excellent common-mode rejection ability and good linearity for a single pH range from 4 to 10, while only 4 nA is drawn from a single 1 V supply voltage. © 2009 ETRI.
Citation
ETRI Journal, 31(2), 243-245, 2009
Subjects