Data Conversion With Subgate-Delay Time Resolution Using Cyclic-Coupled Ring Oscillators
| Autor: | Kari Stadius, Okko Jarvinen, Waqas Siddiqui, Jussi Ryynanen, Marko Kosunen, Vishnu Unnikrishnan |
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| Přispěvatelé: | Department of Electronics and Nanoengineering, Jussi Ryynänen Group, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2021 |
| Předmět: |
Spurious-free dynamic range
time-domain 02 engineering and technology Ring oscillator Data conversion LIDAR cyclic coupled ring oscillator (CCRO) oscillator 0202 electrical engineering electronic engineering information engineering Electronic engineering ring oscillator Time domain Electrical and Electronic Engineering time resolution VCO-based ADC Physics ToF sensor time-of-flight (ToF) data converter Bandwidth (signal processing) Ranging computer.file_format Converters RADAR 020202 computer hardware & architecture Effective number of bits subgate-delay time-to-digital converter (TDC) Hardware and Architecture Analog-to-digital converter (ADC) technology-independent computer oscillator-based Software |
| Zdroj: | IEEE Transactions on Very Large Scale Integration (VLSI) Systems. 29:203-214 |
| ISSN: | 1557-9999 1063-8210 |
| Popis: | An integrated circuit that measures time intervals with high precision and accuracy has a wide range of applications including data conversion, ranging, and 3-D imaging. The resolution with which time intervals are quantized by a ring oscillator or delay line is limited by the minimum delay of an inverter in the technology. We propose the use of cyclic-coupled ring oscillators (CCROs) as a time-domain quantizer to achieve a combination of subgate-delay time resolution together with a short conversion time, thereby enabling data conversion with high resolution as well as high bandwidth. The resolution-power tradeoff in coupled oscillators is studied. Simulation indicates up to a factor-of-13 subgate-delay time resolution with 13 coupled oscillators. A real-time quantizing time-to-digital converter with coupled oscillators is designed for a time-domain analog-to-digital converter. Powered by a factor-of-8 subgate-delay time resolution of 1.6 ps obtained with nine coupled oscillators, and a sample time of 4 ns for 11-bit conversion, the converter delivers a 9.9-bit ENOB over a signal bandwidth of 125 MHz and an SFDR of 88 dB. Results demonstrate that CCROs is an attractive candidate as a high-precision high-linearity time-domain quantizer for data converters. |
| Databáze: | OpenAIRE |
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