Chemically sensitive sensors with sample and hold capacitors
First Claim
1. An apparatus comprising an array of sensors, a sensor in the array including:
- a chemically-sensitive field effect transistor (chemFET);
a sample and hold capacitor;
a first switch connected between a first terminal of the chemFET and a first reference voltage line; and
a second switch directly connected between a second terminal of the chemFET and the sample and hold capacitor.
2 Assignments
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Accused Products
Abstract
Methods and apparatus relating to very large scale FET arrays for analyte measurements. ChemFET (e.g., ISFET) arrays may be fabricated using conventional CMOS processing techniques based on improved FET pixel and array designs that increase measurement sensitivity and accuracy, and at the same time facilitate significantly small pixel sizes and dense arrays. Improved array control techniques provide for rapid data acquisition from large and dense arrays. Such arrays may be employed to detect a presence and/or concentration changes of various analyte types in a wide variety of chemical and/or biological processes. In one example, chemFET arrays facilitate DNA sequencing techniques based on monitoring changes in hydrogen ion concentration (pH), changes in other analyte concentration, and/or binding events associated with chemical processes relating to DNA synthesis.
453 Citations
19 Claims
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1. An apparatus comprising an array of sensors, a sensor in the array including:
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a chemically-sensitive field effect transistor (chemFET); a sample and hold capacitor; a first switch connected between a first terminal of the chemFET and a first reference voltage line; and a second switch directly connected between a second terminal of the chemFET and the sample and hold capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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an array of sensors arranged in rows and columns, a row including a plurality of sensors, each sensor in the plurality including; a chemically-sensitive field effect transistor (chemFET), a sample and hold capacitor, a first switch connected between a first terminal of the chemFET and a first reference voltage line, a second switch directly connected between a second terminal of the chemFET and the sample and hold capacitor, and a cell output circuit having an input connected to the sample and hold capacitor and having an output, the cell output circuit responsive to a row select signal to produce a signal on the output indicating a voltage on the sample and hold capacitor; and a column output driver coupled to the outputs of the plurality of sensors. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification