Table 2 Output accuracy percentage computation
Number of output bits | Percent of error | ||||||
|---|---|---|---|---|---|---|---|
Wallace tree multiplier | Logarithm-based multiplier | ||||||
Logarithm word size in bits | |||||||
6 bits | 9 bits | 12 bits | 15 bits | 18 bits | 21 bits | ||
22 | 40.9% | 58.02% | 44.8% | 25.63% | 18.53% | 7.91% | 3.86% |
20 | 40.23% | 51.17% | 32.11% | 18.13% | 11.68% | 6.87% | 3.15% |
18 | 38.56% | 30.89% | 26.41% | 13.28% | 9.13% | 5.31% | 2.74% |
16 | 36.85% | 29.13% | 18.95% | 9.58% | 5.18% | 2.68% | 2.03% |
15 | 35.03% | 11.16% | 7.58% | 5.91% | 2.86% | 1.98% | 1.06% |
13 | 33.26% | 8.19% | 5.39% | 3.32% | 1.86% | 0.93% | 0.58% |
11 | 31.68% | 5.11% | 2.68% | 2.53% | 1.03% | 0.49% | 0.26% |