Patent ID: 6507302
Filing Date: 2003-01-14
Classification: H03M

Abstract:
A multi-bit &Dgr;&Sgr; A/D converter comprising an analog adding means for outputting a difference between an analog input signal and an analog feedback signal, an analog integrating means for integrating an output signal of said analog adding means, an analog multiplying means for multiplying an output of said analog integrating means by a predetermined coefficient, a multi-bit quantizing means for quantizing an output of said analog multiplying means with a plurality of bits, and a D/A converting means for converting a digital output signal outputted from said multi-bit quantizing means into an analog signal, said D/A converting means outputting said analog signal as said analog feedback signal in a next sampling time, wherein there is provided a digital processing means receiving said digital output signal outputted from said multi-bit quantizing means, for outputting a sum of said digital output signal and a value obtained by multiplying said digital output signal outputted before a predetermined time, by a predetermined coefficient, and a value obtained by subtracting from an output of said digital processing means a value obtained by differentiating a predetermined quantization noise, is outputted.