Abstract
Regarding the requirements for portable multi-media applications, it is concerned with high resolution A/D and low power consumption. Oversampling techniques based on delta-sigma modulation were widely used to implement the digital audio applications. This type of systems requires high dynamic range (i.e., 14~20bit) at bandwidth of 20khz. In this thesis, the third order low distortion modulator was designed to achieve the front interface of delta-sigma data converter. By using the characteristics of system to relax the operation amplifier specification. This modulator was integrated in TSMC 0.35 m CMOS technologies. The simulation result could be achieved a peak SNR of 86dB with signal bandwidth 20khz and oversampling ratio of 64. The power consumption was 5.54mW under normal condition.