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Methods and apparatus for measuring analytes using large scale FET arrays

  • US 8,313,625 B2
  • Filed: 02/28/2011
  • Issued: 11/20/2012
  • Est. Priority Date: 12/14/2006
  • Status: Active Grant
First Claim
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1. A chemical detection circuit, comprising:

  • a chemically-sensitive transistor having a first terminal and a second terminal, said first terminal coupled to a first readout signal line;

    a first switch coupling the second terminal of the chemically-sensitive transistor to a current source, said first switch consisting of a first transistor; and

    a second switch coupling the second terminal of the chemically-sensitive transistor to a second readout signal line, said second switch consisting of a second transistor, wherein the first and second switches are controlled by a selection signal common to the two switches.

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