Method and apparatus for an oversampled digital to analog convertor
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United States of America Patent
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Jan 7, 1997
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N/A
app pub date -
Aug 15, 1995
filing date -
Aug 15, 1995
priority date (Note) -
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Abstract
A method and apparatus for an oversampled single bit digital to analog convertor (DAC) is accomplished by using an FIR filter as the analog reconstruction filter, wherein the FIR filter includes primary current sourcing circuitry and secondary current sourcing circuitry. The primary current sourcing circuitry is used to produce a portion of the FIR coefficients having relatively large values, while the secondary current sourcing circuitry is used to fine tune the FIR coefficients having the relatively large values and to produce the other FIR coefficients. Combining the results of the primary current sourcing circuitry and the secondary current sourcing circuitry produces an analog signal.
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