Low-Offset and Low-Noise Comparators with Calibration Techniques

UM > INSTITUTE OF MICROELECTRONICS

Status	已發表Published
Title	Low-Offset and Low-Noise Comparators with Calibration Techniques
Author	Zhang, W.H.; Zhu, Y.; Chan, C. H.
Date Issued	2018-08-31
Keyword	Low-Noise Comparators Offset Calibration Techniques
Abstract	As the interface between analog and digital world, Comparators are the key components of the flash and Successive Approximation Registers (SAR) Analogto-Digital Converters (ADCs). Such highly digitalized ADCs benefit from the CMOS technology downscaling, achieving better performance with less power consumption and die area. But meanwhile suffering by larger offset and less intrinsic transconductance, the comparators diminish the superiority of digital-assisted architectures. In this thesis, the design techniques for low-offset and low-noise comparator with various calibration schemes will be introduced and analyzed. The first part concentrates on the inputreferred offset in dynamic comparator. Considering with the impact caused by PVT variations, the comparator offset in high-speed ADC should be well calibrated to avoid the performance degradation. A novel digital offset background calibration technique, the offset alignment technique, is proposed and implemented in a 5mV 7-b 2.4-GS/s 1-then-2 b/Cycle SAR ADC. Such calibration scheme does not require extra clock period or alter the sampling network. The measurement results show that the calibration circuit only occupies 0.0017mm2 of chip area and consumes around 300μW power. The second part focuses on the ADC scenario of reference ripple caused by the fast-transient switching in capacitive digital-to-analog converter (CDAC). A threshold reconfigurable comparator is proposed, and used with threshold reconfigurable reference error (TRRE) calibration technique to correct the settling error. With 75 mV reference threshold voltage utilizing this technique, 120 mV ripple error which is approximately 5% VFS can be compensated by the post signal processing
Language	英語English
PUB ID	38605
Document Type	Thesis
Collection	INSTITUTE OF MICROELECTRONICS
Corresponding Author	Zhu, Y.
Recommended Citation GB/T 7714	Zhang, W.H.,Zhu, Y.,Chan, C. H.. Low-Offset and Low-Noise Comparators with Calibration Techniques[D], 2018.

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