Memristor-Assisted Background Calibration for SAR ADCs: A Feasibility Study

Zhaoguang Si, Chaohan Wang, Xiongfei Jiang, Zheyi Li, Guoyang Huang, Alexander Serb, Themis Prodromakis, Shiwei Wang, Christos Papavassiliou

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

This paper proposes a memristor-assisted sign-based background calibration scheme for analog-to-digital converters (ADCs). The scheme was implemented and validated in a 12-bit asynchronous successive approximation register (SAR) ADC, which consists of a hybrid binary weighted/R-2R digital-to-analog converter (binary/R-2R DAC) and other peripheral circuits. This hybrid DAC, in which one redundancy bit is introduced, is built with a memristor and standard polysilicon resistors. The proposed calibration technique can detect the errors caused by DAC mismatches and correct them by adjusting the resistance of the memristor (memristance) in a feedback loop. The implemented circuit takes the memristor's advantages such as small area and resistance switching property. The proposed scheme has been designed and simulated in a standard 180 nm CMOS process. Eventually, a monolithic CMOS/memristor chip will be fabricated with the CMOS part processed at a standard foundry and the memristors integrated through post-CMOS processing in house. Simulation results demonstrate the feasibility of exploiting memristors to improve the linearity of high-resolution SAR ADCs. The designed calibration scheme can effectively reduce the integral non-linearity (INL) and differential non-linearity (DNL) of the 12-bit SAR ADC.

Original languageUndefined/Unknown
Pages (from-to)3497-3508
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number9
Early online date17 May 2023
Publication statusPublished - 1 Sept 2023

Keywords / Materials (for Non-textual outputs)

  • Calibration
  • Codes
  • Memristor
  • Memristors
  • Programming
  • Redundancy
  • Registers
  • Resistance
  • hybrid DAC
  • memristor-assisted calibration

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