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ACTIVE CHEMICALLY-SENSITIVE SENSORS

  • US 20120326767A1
  • Filed: 08/30/2012
  • Published: 12/27/2012
  • Est. Priority Date: 05/29/2009
  • Status: Active Grant
First Claim
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1. An apparatus comprising an array of sensors, a sensor in the array comprising:

  • a chemically-sensitive field effect transistor (chemFET) having a first conduction terminal coupled to a first supply voltage conductor, a second conduction terminal, and a sensor surface;

    a first transistor having a first conduction terminal coupled to the second conduction terminal of the chemFET, a second conduction terminal coupled to a current source conductor, and a gate;

    a second transistor having a gate coupled to the second conduction terminal of the chemFET, a first conduction terminal coupled to a second supply voltage conductor, and a second conduction terminal; and

    a third transistor having a gate coupled to the gate of the first transistor, a first conduction terminal coupled to the second conduction terminal of the second transistor, and a second conduction terminal coupled to an output conductor.

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