Biology Reference
In-Depth Information
Figure 6.10.
TFT switching matrix for potentiometric detection. Each
cell is composed of a sensing transistor (S), a reference dummy transistor
(D),and switch transistors for the sensor (ST-S) and the dummy (ST-D).
needed,whichrequiresbuild-inreferenceandmeasurementcircuits
on the same chip. FETs are ideal to build various analog circuits
including differential input, voltage reference, operational ampli-
fiers, and potentiostat circuit. Requirements on the performance
of those circuits largely depend on the type of application and
specification of sensorarrays.
6.5.2
Specifications of the Biosensor Arrays
Although the ultimate performance of any integrated biosensor
is limited by the properties of the a
nity-based biomolecular
interaction, the method of detection and fabrication impose certain
