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The benefit of high radix Booth encoders in reducing the number of partial products in fast multipliers has been hampered by the complexity of generating the hard multiples. The use of redundant binary (RB) Booth encoder can overcome this problem and avoid the error compensation vector but at the cost of doubling the number of RB partial products. This paper presents a novel covalent RB Booth encoder to generate a compound RB partial product from two adjacent Booth encoded digits. The new encoder fully exploits the characteristics of Booth encoded numbers to restore the effective partial product reduction rate of RB Booth encoder while maintaining the simplicity of hard multiple generators and eliminating the constant correction vector. A legitimate comparison on an 8×8-bit RB multiplier prototype shows that the multiplier constructed with our proposed Booth encoder consumes lower power and computes faster than those with the normal binary and redundant binary Booth encoders.
Date of Conference: 23-26 May 2005