Methods and apparatus for high-speed operation of a chemically-sensitive sensor array
First Claim
1. An apparatus, comprising:
- an array of sensors arranged in rows and columns, each sensor in the array including;
a chemically-sensitive field effect transistor (chemFET), anda cell output circuit having an input connected to the chemFET, and responsive to one of a plurality of row select signals to produce a sensor signal indicating a threshold voltage of the chemFET;
a plurality of column output circuits coupled to the sensors in a column of the array, and responsive to respective column read out signals, wherein the plurality of column output circuits comprise sample and hold capacitors; and
timing circuitry that controls the timing of the row select signals and the column select signals.
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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.
478 Citations
10 Claims
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1. An apparatus, comprising:
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an array of sensors arranged in rows and columns, each sensor in the array including; a chemically-sensitive field effect transistor (chemFET), and a cell output circuit having an input connected to the chemFET, and responsive to one of a plurality of row select signals to produce a sensor signal indicating a threshold voltage of the chemFET; a plurality of column output circuits coupled to the sensors in a column of the array, and responsive to respective column read out signals, wherein the plurality of column output circuits comprise sample and hold capacitors; and timing circuitry that controls the timing of the row select signals and the column select signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating an apparatus comprising an array of chemically sensitive sensors arranged in rows and columns, the sensors comprising chemically-sensitive field effect transistors (chemFETs), comprising:
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enabling a first row of sensors in the array for a first time interval; for a second time interval, enabling a second row of sensors in the array and reading signals from the sensors in the first row sequentially; and after the second time interval, during a third time interval, reading signals from the sensors in the second row in sequence. - View Dependent Claims (8, 9, 10)
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Specification