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Chemically-sensitive sensor array calibration circuitry

  • US 8,575,664 B2
  • Filed: 07/23/2012
  • Issued: 11/05/2013
  • Est. Priority Date: 12/14/2006
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • an array of sensors arranged in rows and columns, a row including a plurality of sensors, each sensor in the plurality including a chemically-sensitive field effect transistor (chemFET) configured to produce a signal on an output in response to a row select signal; and

    a plurality of column output circuits coupled to the outputs of corresponding columns of sensors in the array, and coupled to a circuit to apply a reference voltage to the column output circuits during a calibration operation, wherein a column output circuit in the plurality includes a column sample and hold capacitor directly connected to an input node of the column output circuit.

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