A New Method for Current Differential ISFET/REFET Readout Circuit
Keywords:
ISFET readout circuit, MOSFET differential pairs, current mode, small circuitAbstract
This paper presents a new differential current
mode readout circuit for ion sensitive field effect transistor
(ISFET) to be used as a pH sensor. The circuit used only two
MOSFETs to provide current differential pairs result in
simplification and very small circuit. It provides a linear
sensitivity to pH over a wide range (pH 2-12) which is 25.6
μA/pH with power dissipation of 937.6 μW at 27oC. The circuit
is operating in differential mode, reference field effect transistor
(REFET) is provided to compensate environment conditions.
Temperature compensation in a range of 22-32oC is
investigated. It can be well compensated output varying.
Simulation results validate the performance of the circuit.
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