IMAGE SENSOR SYSTEM WITH SYNCHRONIZED SWITHCED-MODE POWER SUPPLY
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United States of America Patent
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Issued Date -
Apr 1, 2010
app pub date -
Sep 24, 2009
filing date -
Sep 26, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to an image sensor comprising an integrated circuit chip incorporating a matrix of rows and columns of photosensitive pixels and a read amplifier, the amplifier supplying successive signals representing the lighting of the different pixels of the image, with a pixel reading frequency determined by a system clock. The system is powered by a general power supply voltage and the read amplifier is powered by a stabilized power supply voltage supplied by a DC/DC voltage converter receiving the general power supply voltage. The DC/DC converter comprises a switched-mode power supply that uses a switch to chop a direct current at high frequency and a rectifier to rectify and filter the chopped current. The chopping frequency is the pixel reading frequency, which eliminates certain power supply-related noises that degrade the video signal.
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