Semiconductor device
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United States of America Patent
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Mar 9, 2010
Grant Date -
Apr 17, 2008
app pub date -
Oct 5, 2005
filing date -
Oct 7, 2004
priority date (Note) -
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Abstract
The invention provides a semiconductor device that generates a clock signal with a fixed pulse width from a carrier. The invention also provides a semiconductor device where data can be obtained accurately from a carrier using a clock signal with a fixed pulse width. Further, the invention provides a semiconductor device that has a simpler circuit configuration and a smaller scale, and consumes less power as compared to the PLL circuit. According to the invention, a signal obtained by dividing a carrier including 100% modulation is not used as a clock signal, and a correction circuit is used to generate a clock signal using a demodulated signal and a signal obtained by dividing the carrier including 100% modulation. According to the invention having such a configuration, a clock signal with a fixed pulse width can be generated.
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