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ACTIVE CHEMICALLY-SENSITIVE SENSORS WITH CORRELATED DOUBLE SAMPLING

  • US 20120329044A1
  • 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 including;

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

    a second transistor having a gate coupled to a first control signal conductor, a first conduction terminal coupled to the first conduction terminal of the chemFET, and a second conduction terminal coupled to an amplifier node;

    a reset circuit coupled to the amplifier node and having an input coupled to a second control signal conductor, the reset circuit to reset the amplifier node to a reference voltage in response to a signal on the second control signal conductor;

    an amplifier having an input connected to the amplifier node and having an output coupled to an output conductor; and

    a controller to cause the amplifier to provide a first output while the amplifier node is reset to the reference voltage, and to cause the amplifier to provide a second output while the chemFET is coupled to the amplifier node.

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