Isfet switch
AssigneeDNA Electronics Limited
InventorsChristofer Toumazou, Abdulrahman Al-Ahdal
Life of this patent
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Abstract
There is provided a semiconductor device for detecting a change in ion concentration of a sample and method of using same. The device comprises a plurality of Field Effect Transistors (FETs) coupled to a common floating gate and an ion sensing layer exposed to the sample and coupled to the floating gate. There may be other input voltages coupled to the floating gate.
Claims26
A semiconductor device for detecting a change in ion concentration of a sample, the device comprising:
- a plurality of Field Effect Transistors (FETs) coupled to a common floating gate;
- and an ion sensing layer exposed to the sample and coupled to the floating gate;
- and
- a circuit comprising the plurality of FETs to provide a digital output whose state depends on the ion concentration of the sample.
A semiconductor device for detecting an change in ion concentration of a sample, the device comprising:
- a plurality of Field Effect Transistors (FETs) coupled to a common floating gate;
- and
- an ion sensing layer exposed to the sample and coupled to the floating gate;
- wherein, in use, a current through the transistors is switched on or off depending on the magnitude of the ion concentration in the sample in proximity to the sensing layer compared to a switching threshold.
A circuit for detecting a plurality of chemical reactions and evaluating a logical function having the result of each of the plurality of chemical reactions as its inputs, the circuit comprising:
- at least one reaction chamber for each of the plurality of chemical reactions, which chemical reactions change an ion concentration in the reaction chamber;
- wherein each reaction chamber is provided with a device having a plurality of Field Effect Transistors (FETs) coupled to a common floating gate, device providing a digital output signal whose state depends on the ion concentration of a sample in that chamber, and wherein the outputs are coupled together to form a digital signal processing circuit for evaluating a logical function.
A method of providing a output representing a concentration of a target ion in a sample, the method comprising:
- providing a CMOS switch comprising a plurality of Field Effect Transistors (FETs) coupled to a common floating gate and an ion sensing layer exposed to the sample and coupled to the floating gate;
- exposing the ion sensitive layer to the sample to switch a state of the CMOS switch on or off;
- and
- outputting a signal from the CMOS switch.
Dependencies are inferred from the claim text.