LOGARITHM AND SQUARE ROOT TRANSFORMATION CIRCUIT,申请号JP20050162966-传众专利搜索

LOGARITHM AND SQUARE ROOT TRANSFORMATION CIRCUIT

申请公布号：JP2006338390(A)

申请号：JP20050162966

申请日期：2005.06.02

申请公布日期：2006.12.14

申请人：

ADVANTEST CORP

发明人：KUMAGAI KENICHIRO;ARAI MICHIAKI

分类号：G06F7/556;G06F7/52;G06F7/552

主分类号：G06F7/556

摘要：<P>PROBLEM TO BE SOLVED: To attain a logarithmic transformation highly precisely with a circuit configuration without using a CORDIC circuit. <P>SOLUTION: The logarithmic transformation is performed by a detector of a bit position E for comparing binary data from higher-order bits and calculating and outputing a bit position E to be a first 1, a divider for taking a value obtained by dividing the data by the E-th power of 2 as a value of Mant, a storing means for preliminarily storing a base 2 logarithm of respective Mants in a table and reading the base 2 logarithm of Mant for a desired Mant with reference to the table, and an adding means for adding and outputing the logarithm of Mant read from the storing means to the calculated E. <P>COPYRIGHT: (C)2007,JPO&INPIT