Analogue to digital converter
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United States of America Patent
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May 4, 2004
Grant Date -
Apr 24, 2003
app pub date -
Sep 30, 2002
filing date -
Oct 3, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A pipeline/subranging architecture is used to provide a circuit for analog to a digital conversion. A course analog to digital converter, a fine analog to digital to converter, combining logic circuitry and a digital to analog converter are used, together with a voltage to current converter and a current to voltage converter. A residual signal is formed as the difference between the input signal and an output signal of the coarse analog to digital conversion, the latter output signal having been converted to analog form by the analog to digital converter. The residual signal is then scaled appropriately and applied to the fine analog to digital converter. A final output signal is based on the output signals of the coarse digital to analog converter and the fine digital to analog converter.
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