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Access Type
WSU Access
Date of Award
January 2023
Degree Type
Dissertation
Degree Name
Ph.D.
Department
Electrical and Computer Engineering
First Advisor
Mohammed Ismail
Abstract
With the emergence of 5G vehicle-to-everything (V2X) communication systems, it's essential to design efficient radios suitable for this application. Since this is a new technology, the existing literature has not yet sufficiently addressed this important issue. V2X communication technology will provide the foundation for vehicles to interact with each other and everything else nearby. This feature provides improved predictability for road safety and autonomous driving.
In this study, a new frequency planning scheme was introduced with the aim of addressing different 5G V2X requirements while simultaneously reducing hardware complexity, enhancing power consumption efficiency, and optimizing the radio's chip area. The proposed architecture represents advancement in programmable radio design for 5G V2X, as it successfully responds to all 5G V2X demands through the utilization of shared local oscillators within two data paths of 5G V2X.
With the increased demand in data transfer rate in V2X communication systems, the need for accurate analog to digital conversion has increased. Analog-to-digital converters (ADC) are one of the major building blocks in wireless transceivers used in V2X communication systems. Time-interleaved analog to digital converter (TI ADC) is a suitable choice for V2X transceiver design. In this work a pioneering approach by incorporating a programmable TI ADC in the design of the programmable radio is introduced which significantly mitigates hardware complexity concerns for 5G V2X applications.
TI ADCs allow the use of multiple identical lower sample-rate ADCs to achieve a higher data rate analog to digital conversion process. With time interleaving, each channel is granted a longer conversion time, thus improving the linear power-speed region. However, TI ADCs suffer from different types of errors which degrade their performance. Offset error, gain error, and time skew error are the three well-known errors in TI ADCs. Among these errors time skew error is the most difficult one to detect and correct. Most existing time skew calibration methods for TI ADCs involve complex circuits. In this work, a new time skew calibration method is proposed, aiming to improve the time skew calibration convergence time while maintaining a simple hardware implementation. The proposed time skew calibration method uses a level detector with four different levels instead of a zero detector to enhance the time skew calibration convergence time.Compared to the works where a zero detector is used for time skew calibration, our work is about 6 times faster.
The proposed programmable TI SAR ADC for the programmable 5G V2X radio was designed and laid out using 22 nm FDSOI technology. Post-layout simulation results show that the ADC consumes approximately 2.5 mW from a 0.8V supply. The Effective Number of Bits (ENOB) for the proposed design is nearly 6.6 bits. Furthermore, the proposed TI SAR ADC layout occupies an area of approximately 300 um × 440 um.
Recommended Citation
Navidi, Seyedeh Masoumeh, "Time-Interleaved Sar Adcs For Multi-Band 5g V2x Wireless Transceivers" (2023). Wayne State University Dissertations. 3909.
https://digitalcommons.wayne.edu/oa_dissertations/3909