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Image readout circuit with capacitor that is shared between sample and hold and buffer

  • US 8,610,046 B2
  • Filed: 06/16/2011
  • Issued: 12/17/2013
  • Est. Priority Date: 06/16/2011
  • Status: Active Grant
First Claim
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1. An image readout device, comprising:

  • a connection to at least one pixel output receiving a pixel output from an image sensor, said connection including a sample and hold capacitor which is used for sampling and holding the pixel output, said sample and hold capacitor including first and second terminals;

    a buffer amplifier, connected to buffer and amplify said pixel output; and

    a circuit reconfiguration element which reconfigures the connection such that the same sample and hold capacitor which is used for sampling and holding signals from the image sensor is reused as a part of said buffer amplifier by switching both the first and second terminals of the sample and hold capacitor into a feedback loop of the buffer amplifier.

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