Delta-sigma modulator
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United States of America Patent
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May 24, 2011
Grant Date -
Sep 9, 2010
app pub date -
Aug 21, 2007
filing date -
Aug 23, 2006
priority date (Note) -
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Abstract
The present invention provides a continuous-time delta-sigma modulator which is configured with an SC (SCR) feedback DA (103) for improving tolerance to jitter for a clock signal and operates stably by maintaining a certain feedback amount without being influenced by a change in a production process thereof or an operating temperature condition thereof. By adjusting a reference voltage Vref that determines an output voltage of the SC feedback DA (103), it is possible to feed back a certain amount of charge from the SC feedback DA (103) to a loop filter (101). Thereby, operation of the delta-sigma modulator is stabilized.
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