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Segmented focal plane array architecture

  • US 9,918,023 B2
  • Filed: 12/13/2013
  • Issued: 03/13/2018
  • Est. Priority Date: 04/23/2010
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a focal plane array (FPA) comprising;

    a first die comprising an array of active bolometers adapted to receive infrared (IR) radiation from a scene and a selected portion of a read-out integrated circuit (ROIC) for the array of active bolometers, the selected portion of the ROIC comprising analog circuitry configured to provide analog signals in response to the IR radiation received by the array of active bolometers;

    a second die comprising a remainder of the ROIC for the array of active bolometers such that components of the ROIC are distributed between the first and the second die, the first die stacked on top of the second die to expose the array of active bolometers for receiving the IR radiation;

    a plurality of inter-die connections adapted to pass signals between the first die and the second die, wherein the passed signals are used to generate output values corresponding to the IR radiation received at the array of active bolometers; and

    a bias correction circuit implemented on the first die and a low-dropout regulator (LDO) implemented on the second die and configured to provide a regulated voltage to the bias correction circuit via one or more of the plurality of inter-die connections, wherein the bias correction circuit is configured to provide the bias voltage to the array of active bolometers in response to the regulated voltage from the LDO.

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