Delta sigma modulator operating with different power source voltages
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United States of America Patent
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Dec 22, 2009
Grant Date -
Nov 27, 2008
app pub date -
May 20, 2008
filing date -
May 22, 2007
priority date (Note) -
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Abstract
In a delta sigma modulator including first and second integration circuits connected in cascade, each as a component thereof, first and second power source terminals for supplying first and second different power source voltages to the first and second integration circuits are provided. The first power source voltage is supplied to the former-stage first integration circuit having a SNR which is largely affected by the magnitude of the power source voltage. The second power source voltage lower than the first power source voltage is supplied to the latter-stage second integration circuit having a SNR which is not largely affected by the magnitude of the power source voltage.
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