Xilinx DS291, LogiCORE IP Complex Multiplier v3.1, Data Sheet
Xilinx DS291, LogiCORE IP Complex Multiplier v3.1, Data Sheet
Xilinx DS291, LogiCORE IP Complex Multiplier v3.1, Data Sheet
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X-Ref Target - Figure 3<br />
output<br />
For rounding the (PDF) of the noise is:<br />
1<br />
2<br />
3<br />
3 2 1 0<br />
input<br />
1 2 3<br />
the mean and the variance of the error introduced are:<br />
3<br />
2<br />
1<br />
0<br />
pe ( )<br />
Figure 3: Rounding<br />
⎧<br />
⎪1<br />
⎨--<br />
– Δ ⁄ 2 < e < Δ ⁄ 2<br />
⎪Δ<br />
⎩0<br />
otherwise<br />
<strong>LogiCORE</strong> <strong>IP</strong> <strong>Complex</strong> <strong>Multiplier</strong> <strong>v3.1</strong><br />
= Equation 8<br />
Δ ⁄ 2<br />
Δ ⁄ 2<br />
m<br />
e<br />
= ∫ ep( e)<br />
de<br />
= --<br />
1<br />
Δ ∫ ede = 0<br />
Equation 9<br />
– Δ ⁄ 2<br />
– Δ ⁄ 2<br />
2<br />
σ<br />
e<br />
e 2 Δ ⁄ 2<br />
pe ( ) de<br />
--<br />
1<br />
∫<br />
e<br />
Δ<br />
– Δ ⁄ 2<br />
2 Δ ⁄ 2<br />
Δ<br />
∫ de<br />
– Δ ⁄ 2<br />
2<br />
= = = ------<br />
12<br />
Equation 10<br />
Therefore, the ideal rounder introduces no DC bias to the signal flow. If the full product word (for example, a r b r -<br />
a i b i ) is represented with B P bits, and the actual result of the core (for example, p r ) is represented with B R bits, then<br />
bits B P -1...B P -B R are the integer part, and B P -B R -1..0 are the fractional part of the result.<br />
<strong>DS291</strong> March 1, 2011 www.xilinx.com 8<br />
Product Specification