One-transistor pixel array
First Claim
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1. A device comprising:
- an array of chemically-sensitive field-effect transistors (chemFETs), at least some chemFETs in the array of chemFETs comprising;
a first source/drain terminal and a second source/drain terminal; and
a floating gate coupled to a passivation layer;
a plurality of first conductive lines coupled to chemFETs in the array, wherein each first conductive line in the plurality of first conductive lines is directly connected to the first source/drain terminals of chemFETs in a column in the array; and
a plurality of second conductive lines coupled to chemFETs in the array, wherein each second conductive line is directly connected to the second source/drain terminals of chemFETs in a row in the array;
bias circuitry coupled to the array to apply a read bias to selected chemFETs via the first conductive lines and second conductive lines; and
sense circuitry coupled to the array to sense charge coupled to the floating gates of selected chemFETs.
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Abstract
To reduce the pixel size to the smallest dimensions and simplest form of operation, a pixel may be formed by using only one ion sensitive field-effect transistor (ISFET). This one-transistor, or 1T, pixel can provide gain by converting the drain current to voltage in the column. Configurable pixels can be created to allow both common source read out as well as source follower read out. A plurality of the 1T pixels may form an array, having a number of rows and a number of columns and a column readout circuit in each column.
405 Citations
20 Claims
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1. A device comprising:
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an array of chemically-sensitive field-effect transistors (chemFETs), at least some chemFETs in the array of chemFETs comprising; a first source/drain terminal and a second source/drain terminal; and a floating gate coupled to a passivation layer; a plurality of first conductive lines coupled to chemFETs in the array, wherein each first conductive line in the plurality of first conductive lines is directly connected to the first source/drain terminals of chemFETs in a column in the array; and a plurality of second conductive lines coupled to chemFETs in the array, wherein each second conductive line is directly connected to the second source/drain terminals of chemFETs in a row in the array; bias circuitry coupled to the array to apply a read bias to selected chemFETs via the first conductive lines and second conductive lines; and sense circuitry coupled to the array to sense charge coupled to the floating gates of selected chemFETs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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an array of chemically-sensitive field-effect transistors (chemFETs), at least some chemFETs in the array of chemFETs comprising; a first source/drain terminal and a second source/drain terminal; and a floating gate coupled to a passivation layer; a plurality of first conductive lines coupled to chemFETs in the array, wherein each first conductive line in the plurality of first conductive lines is directly connected to the first source/drain terminals of a corresponding first plurality of chemFETs in the array; and a plurality of second conductive lines coupled to chemFETs in the array, wherein each second conductive line in the plurality of second conductive lines is coupled to the second source/drain terminals of a corresponding second plurality of chemFETs in the array. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A device comprising:
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an array of chemically-sensitive field-effect transistors (chemFETs) arranged in a plurality of rows and a plurality of columns, chemFETs in the array of chemFETs comprising; a first source/drain terminal and a second source/drain terminal; and a floating gate coupled to a passivation layer; a plurality of column lines coupled to chemFETs in the array, wherein each column line in the plurality of column lines is directly connected to the first source/drain terminals of chemFETs arranged in a corresponding column in the plurality of columns; a plurality of row lines coupled to chemFETs in the array, wherein each row line in the plurality of row lines is directly connected to the second source/drain terminals of chemFETs arranged in a corresponding row in the plurality of rows; circuitry coupled to the plurality of column lines and row lines for reading a selected chemFET connected to a selected column line and a selected row line, the circuitry comprising; bias circuitry coupled to the row lines to apply a read voltage to the selected row line in the plurality of row lines during a read interval, and to apply voltages to corresponding row lines and corresponding column lines connected to unselected chemFETs connected to the selected column line; and sense circuitry to sense an ion-concentration of an analyte solution coupled to the floating gate via the passivation layer in the selected chemFET based on a sampled voltage level on the selected column line, wherein the sampled voltage level is established based on the current flowing on the selected column line. - View Dependent Claims (19, 20)
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Specification