Design of an 8-bit CMOS dynamic voltage reference analog-to-digital converter

• Main Author: Zhang, Lian
• Other Authors: Siek Liter
• Format: Final Year Project
• Language: English
• Published: 2016
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/67653
• Institution: Nanyang Technological University

In this project, an 8-bit dynamic voltage reference analog-to-digital converter (ADC) is designed to encode a continuous-time analog input signal ranging from 0 to 1V into 8-bit discrete digital words, where ‘0’ is represented by 0V and ‘1’ is represented by 1.8V supply voltage level. The circuit design of this project is implemented in Cadence Virtuoso® Schematic Editor and simulated in Cadence Virtuoso® Analog Design Environment (ADE). In the ADC dynamic characterization part, MATLAB® is utilized to facilitate Fast Fourier Transform (FFT) analysis. The proposed 8-bit CMOS dynamic voltage reference based ADC consists of several sub-blocks such as voltage comparator, current steering digital-to-analog converter (DAC) and wide-swing constant transconductance bias with start-up. Validated by AMS 0.18 μm CMOS process, the proposed ADC can achieve an effective number of bits (ENOB) of 7.6168 bits with a sampling frequency of 2.5 MHz. The power consumption is 4.9842 mW under 1.8 V supply voltage. Compared with other reported 8-bit ADC counterparts, it shows a good Figure-of-Merit (FOM) of 10.157 pJ with other comparable performance.