Chemical sensor array with leakage compensation circuit
First Claim
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1. A device comprising:
- an array of chemically-sensitive field-effect transistors (chemFETs) coupled to a plurality of lines; and
a circuit for reading a selected chemFET in the array, the selected chemFET coupled to a first line and a second line in the plurality of lines, the circuit to;
induce a current between the first line and the second line through the selected chemFET to establish a voltage on the second line;
compensate for leakage current through at least one additional chemFET coupled to the second line; and
read the selected chemFET based on the voltage on the second line.
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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.
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Citations
9 Claims
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1. A device comprising:
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an array of chemically-sensitive field-effect transistors (chemFETs) coupled to a plurality of lines; and a circuit for reading a selected chemFET in the array, the selected chemFET coupled to a first line and a second line in the plurality of lines, the circuit to; induce a current between the first line and the second line through the selected chemFET to establish a voltage on the second line; compensate for leakage current through at least one additional chemFET coupled to the second line; and read the selected chemFET based on the voltage on the second line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification