Leakage mitigation at image storage node
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United States of America Patent
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Dec 12, 2017
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app pub date -
Jan 5, 2016
filing date -
Jan 5, 2016
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Abstract
A leakage mitigation circuit is provided. The leakage mitigation circuit includes an inverter coupled to a storage node, wherein the storage node receives a signal output by an imaging pixel having a first voltage level to be stored. The inverter inverts the signal to a second voltage level. A single transistor coupled to the inverter and the storage node inverts the signal output by the inverter to the first level to hold the signal at the storage node to its original level. A self-biased device coupled to the inverter lowers current disturbance related to the storage node and increase threshold voltage at which fluctuation of the level of the signal at the storage node causes the signal to be inverted by the inverter.
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