Code mapping method applied to digital-to analog converter

Abstract

A code mapping method includes: providing M bits of digital input codes; checking the 1 st bit of the M bits to generate a checking result; determining whether to perform 2's compliment operation on the 2 nd to M th bits according to the checking result; and converting the 1 st to N th bits of the M bits into P bits according to a designated mapping manner.

1 . A code mapping method, comprising:
 providing M bits of digital input codes;   checking the 1 st  bit of the M bits to generate a checking result;   determining whether to perform 2's compliment operation on the 2 nd  to M th  bits according to the checking result; and   converting the 1 st  to N th  bits of the M bits into P bits according to a designated mapping manner.   
     
     
         2 . The code mapping method of  claim 1 , wherein the step of determining whether to perform 2's compliment operation on the 2 nd  to M th  bits according to the checking result comprises:
 when the checking result indicates that the 1 st  bit of the M bits is low, unchanging the 2 nd  to M th  bits; and   when the checking result indicates that the 1 st  bit of the M bits is high, performing 2's compliment operation on the 2 nd  to M th  bits.