Apparatus for computing exponential and trigonometric functions
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United States of America Patent
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Apr 2, 2002
Issued Date -
N/A
app pub date -
Feb 15, 2000
filing date -
Feb 25, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A 64-bit precision digital circuit for computing the exponential function and a related 64-bit precision digital circuit for computing sine and cosine, each circuit comprising a master circuit and a slave circuit. The master circuit computes the remainders x.sub.i for every 'logical' iteration i using fast, low-precision circuit, thereby accumulating temporary errors. Only at the end of every 8 i's, which marks the end of a 'physical' iteration, is a complete and fast correction to the accumulated errors performed. The slave circuit computes quantities called the y.sub.i 's, which will eventually converge to the desired output.
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