Patent ID: 6538589
Filing Date: 2003-03-25
Classification: H03M

Abstract:
A digital &Dgr;&Sgr; modulator comprising:a first-stage 1-bit &Dgr;&Sgr; modulator provided with an 1-bit (1 is an arbitrary natural number) quantizer, for modulating digital data; a correction logic for multiplying a quantization error caused in said 1-bit quantizer by a correction so that the quantization error caused in said 1-bit quantizer is eliminated at an output of said first-stage 1-bit &Dgr;&Sgr; modulator; and a next-stage m-bit &Dgr;&Sgr; modulator provided with an m-bit (m is an arbitrary natural number larger than 1) quantizer, for modulating and feeding the quantization error which is multiplied by the correction by said correction logic back to said first-stage 1-bit &Dgr;&Sgr; modulator.