Active chemically-sensitive sensors with correlated double sampling
First Claim
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1. An apparatus, comprising:
- an array of sensors, a sensor in the array including;
a chemically-sensitive field effect transistor (chemFET) having a first conduction terminal, a second conduction terminal coupled to a first supply voltage conductor, and a sensor surface;
a first transistor having a first conduction terminal coupled to the first conduction terminal of the chemFET, a second conduction terminal coupled to a second supply voltage conductor, and a gate coupled to a bias voltage conductor; and
a second transistor having a gate coupled to a first control signal conductor, a first conduction terminal coupled to the first conduction terminal of the chemFET, and a second conduction terminal coupled to an amplifier node;
a reset circuit coupled to the amplifier node and having an input coupled to a second control signal conductor, the reset circuit to reset the amplifier node to a reference voltage in response to a signal on the second control signal conductor;
an amplifier having an input connected to the amplifier node and having an output coupled to an output conductor, the amplifier includes;
a third transistor having a gate coupled to the amplifier node, a first conduction terminal coupled to a third supply voltage conductor, and a second conduction terminal; and
a fourth transistor having a gate coupled to a select signal conductor, a first conduction terminal coupled to the second conduction terminal of the third transistor, and a second conduction terminal coupled to the output conductor; and
a controller to cause the amplifier to provide a first output while the amplifier node is reset to the reference voltage, and to cause the amplifier to provide a second output while the chemFET is coupled to the amplifier node.
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Abstract
Methods and apparatus relating to FET arrays for monitoring chemical and/or biological reactions such as nucleic acid sequencing-by-synthesis reactions. Some methods provided herein relate to improving signal (and also signal to noise ratio) from released hydrogen ions during nucleic acid sequencing reactions.
456 Citations
9 Claims
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1. An apparatus, comprising:
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an array of sensors, a sensor in the array including; a chemically-sensitive field effect transistor (chemFET) having a first conduction terminal, a second conduction terminal coupled to a first supply voltage conductor, and a sensor surface; a first transistor having a first conduction terminal coupled to the first conduction terminal of the chemFET, a second conduction terminal coupled to a second supply voltage conductor, and a gate coupled to a bias voltage conductor; and a second transistor having a gate coupled to a first control signal conductor, a first conduction terminal coupled to the first conduction terminal of the chemFET, and a second conduction terminal coupled to an amplifier node; a reset circuit coupled to the amplifier node and having an input coupled to a second control signal conductor, the reset circuit to reset the amplifier node to a reference voltage in response to a signal on the second control signal conductor; an amplifier having an input connected to the amplifier node and having an output coupled to an output conductor, the amplifier includes; a third transistor having a gate coupled to the amplifier node, a first conduction terminal coupled to a third supply voltage conductor, and a second conduction terminal; and a fourth transistor having a gate coupled to a select signal conductor, a first conduction terminal coupled to the second conduction terminal of the third transistor, and a second conduction terminal coupled to the output conductor; and a controller to cause the amplifier to provide a first output while the amplifier node is reset to the reference voltage, and to cause the amplifier to provide a second output while the chemFET is coupled to the amplifier node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification