Improved Double Integration DeltaSigma Modulations for A to D and D to A Conversion

This paper describes a new form of ??double integration?? delta sigma modulator as the analog- to-digital and digital-to-analog converter for the voiceband signals. It has the following three features compared with the earlier double integration delta sigma modulator. 1) The processing of the sampling rate can be executed at 1/2 clock speed. 2) The low-voltage power drive and expansion of the dynamic range are possible because the internal integral voltage is 1/2 or less. 3) The noise component out of the baseband is attenuated more effectively to improve the signal-to-noise ratios. The properties of this new modulator and its performance are demonstrated with computer simulations.