Gain scaling for higher signal-to-noise ratios in multistage, multi-bit delta sigma modulators
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United States of America Patent
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Sep 21, 2004
Grant Date -
May 8, 2003
app pub date -
Dec 23, 2002
filing date -
Jan 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An n-bit quantizer of a downstream modulator stage is configured to produce an n-bit quantized signal from an analog signal having a range. The n-bit quantizer divides the range into 2.sup.n subranges. A first subrange of the 2.sup.n subranges is bounded by a lowest value of the range, a second subrange of the 2.sup.n subranges is bounded by a highest value of the range, and at least one remaining subrange of the 2.sup.n subranges is positioned between the first and the second subranges. The first and the second subranges each measure greater than {1/[2(2.sup.n -1)]} of the total range. Each of the at least one remaining subrange measures less than [1/(2.sup.n -1)] of the total range. A first gain of an integrator of the downstream modulator stage is set so that the downstream modulator stage is stable. A second gain of a stability correction gain element of a coupling stage connected to the downstream modulator is set so that a swing of the analog signal remains within a dynamic range of the downstream modulator stage.
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