System for Charge-Domain Electron Subtraction in Demodulation Pixels and Method Therefor
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United States of America Patent
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Issued Date -
Dec 9, 2010
app pub date -
Jun 9, 2010
filing date -
Jun 9, 2009
priority date (Note) -
Abandoned
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Abstract
A method and system enable the subtraction of charge carrier packages in the low-noise charge domain, which is particularly interesting for the operation of demodulation pixels when high background light signals are present. The method comprises the following steps: demodulation of an optical signal and integration of the photo-generated charge carriers; charge transfer to an external capacitance. The second step means a recombination of electrons and holes in the charge domain and an influencing of the opposite charge carriers on the second plate of the capacitance. This approach allows for low-noise subtraction of charge packages in the charge domain and, at the same time, for creating pixels with much higher fill factors because the capacitances can be optimized for storing just the differential parts, without the DC component.
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