A 11.75-bit Modified Sturdy MASH-21 Delta-Sigma AD Converter for audio application

• Main Authors: Ting-Hui Chang, 張庭卉
• Other Authors: Chia-Yu Yao
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/b4a7sv

碩士 === 國立臺灣科技大學 === 電機工程系 === 107 === CD audio, which is sampled using 44.1kHz sampling rate and each sample has 16 bits, is a hight-quality standard in audio applications. With a great demand on movies and musics , the analog-to-digital converter(ADC)that generates CD-quality digital signal plays an important role in these markets .Therefore, it is a challenging issue to make a low-cost ADC product with low power consumption , high resolution , and high linearity recording identity . This paper implemeted a system of modified sturdy MASH-21 delta-sigma modulator with 11.63-bit resolution. We modified the sturdy-MASH architecture by employing both inverting and non-inverting integrators. We use the fully-differential opamp as the amplifier in the switch-capacitor integrator. The chip was fabricated in TSMC 0.18 um CMOS process. The chip area is 1.68mm2. The operating voltage is set at 1 volt. The sampling frequency is 5.9976 MHz with over-sampling as 136 and the system bandwidth is 22.05 kHz. The power consumption of the proposed delta-digma modulator is 2.743mW.