Array column integrator
First Claim
1. A device comprising:
- a chemically-sensitive field-effect transistor (chemFET) including a first terminal and a second terminal, and a floating gate coupled to a passivation layer;
an integrator circuit coupled to the second terminal of the chemFET via a data line, the integrator circuit to;
apply a bias voltage to the data line during a read interval, thereby inducing a current through the chemFET based on a threshold voltage of the chemFET; and
generate an output signal proportional to an integral of the induced current through the chemFET during the read interval.
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Accused Products
Abstract
Circuits are described for reading a chemically-sensitive field-effect transistor (chemFET) with an improved signal-to-noise ratio. In one embodiment, a device is described that includes a chemFET including a first terminal and a second terminal, and a floating gate coupled to a passivation layer. An integrator circuit is coupled to the second source/drain terminal of the chemFET via a data line. The integrator circuit applies a bias voltage to the data line during a read interval, thereby inducing a current through the chemFET based on a threshold voltage of the chemFET. The integrator circuit then generates an output signal proportional to an integral of the induced current through the chemFET during the read interval.
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Citations
17 Claims
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1. A device comprising:
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a chemically-sensitive field-effect transistor (chemFET) including a first terminal and a second terminal, and a floating gate coupled to a passivation layer; an integrator circuit coupled to the second terminal of the chemFET via a data line, the integrator circuit to; apply a bias voltage to the data line during a read interval, thereby inducing a current through the chemFET based on a threshold voltage of the chemFET; and generate an output signal proportional to an integral of the induced current through the chemFET during the read interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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a chemically-sensitive field-effect transistor (chemFET) including a first terminal and a second terminal, and a floating gate coupled to a passivation layer; bias circuitry to bias the first terminal of the chemFET to a first bias voltage during a read interval, and produce a bias current through chemFET during the read interval, thereby establishing a voltage on the second terminal of the chemFET based on a threshold voltage of the chemFET; and sense circuitry coupled to the second terminal of the chemFET, the sense circuitry comprising; a resistive element coupled between the second terminal of the chemFET and a sensing node; and an integrator circuit to bias the sensing node to a second bias voltage, and to generate an output signal proportional to an integral of a difference in voltage between the second terminal of the chemFET and the second bias voltage during the read interval. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification