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High Performance Digitally-Assisted Time Domain ADC Design for DPLL used in Cellular IOT

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Typical Vernier Delay Line based TDC (Time to Digital Convertor)

Short Description

As CMOS process node is progressing towards quantum level, voltage headroom is reduced correspondingly while transistor speed is increased on the other hand. Therefore, it is time to use time, indicating that it is beneficial to incorporate signal information into time domain rather than conventional analog voltage domain. This gives the birth of phase domain Digital PLL and thus the emerging of time domain ADC. Compared with its mature analog counterpart topic (Phase/Frequency Detector+ Charge Pump), concept of ADC is leveraged into DPLL to quantize analog phase /frequency error in time domain. This topic is drawing more and more attention over the past 5 years as seen in numerous top publications and patents. Highly digitally-assisted analog design is the trend for time domain ADC, such as DTC+TDC, Bang-Bang Detector. Following such a trend, the aim of this project is to analyze and build a time domain ADC innovatively so that the in-band jitter contribution of the DPLL could be lower than 500fs while consuming power less than 1 mW.

Status: Available

Looking for 1-2 Semester students
Contact: Lianbo Wu




30% Theory
70% Circuit Design


Qiuting Huang

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Detailed Task Description


Practical Details



  1. R. B. Staszewski and P. T. Balsara, "All-Digital Frequency Synthesizer in Deep-Submicron CMOS", New Jersey: John Wiley & Sons, Inc., 261 pages, ISBN: 978-0471772552, Sept. 2006. DOI: 10.1002/9780470041956.↑ top