Efficient angle rotator configured for dynamic adjustment
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United States of America Patent
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Feb 23, 2016
Grant Date -
Jul 10, 2014
app pub date -
May 14, 2013
filing date -
Nov 9, 2006
priority date (Note) -
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Abstract
An apparatus and method for angle rotation is disclosed to rotate a complex input by the angle θ to produce a rotated complex output signal. A memory storage device generates control information based on a coarse angle θM. A coarse rotation butterfly circuit uses the control information to rotate the complex input signal by the coarse angle θM to produce an intermediate complex number. The control information controls one or more multiplexers and/or adders in the coarse rotation butterfly circuit to rotate the complex input signal. The fine rotation butterfly circuit uses the control information to rotate the intermediate complex number by a fine angle θL to produce the complex output signal. The control information controls one or more multiplexers and/or adders in the fine rotation butterfly circuit to rotate the intermediate complex number.
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