A Two-Step Resolution-Reconfigurable Time-to-Digital Converter Using SAR ADC
- Resource Type
- Conference
- Authors
- Tong, Xing; Hella, Mona; Chowdhury, Asif
- Source
- 2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS) Circuits and Systems (MWSCAS), 2021 IEEE International Midwest Symposium on. :579-582 Aug, 2021
- Subject
- Bioengineering
Communication, Networking and Broadcast Technologies
Computing and Processing
Engineering Profession
Power, Energy and Industry Applications
Robotics and Control Systems
Signal Processing and Analysis
Semiconductor device measurement
Circuits and systems
Prototypes
Spatial resolution
Clocks
Reconfigurable circuits
time-to-digital converter (TDC)
time-to-voltage converter (TVC)
time-of-flight (ToF)
- Language
- ISSN
- 1558-3899
This paper presents a resolution reconfigurable ADC-assisted time-to-digital converter (TDC). The reconfigurable resolution and range are achieved by adjusting reference currents in the time-to-voltage converter (TVC) and the reference voltages in the ADC. The proposed resolution-reconfigurable approach combined with a two-step hierarchical architecture can be employed in a wide range of applications with different spatial range and resolution requirements. A prototype chip is fabricated using AMS 350nm process, with a core area of 0.15mm 2 . Measurement results show that the TDC achieves a resolution of 39ps with a 100MHz clock, or 78ps with a 50MHz reference clock. In both cases, the measurement rate is 384kS/s while consuming less than 6.7mW from a 3.3V supply.