A Low Power Current-Mode Flash ADC with Spin Hall Effect based Multi-Threshold Comparator

Zhezhi He, Deliang Fan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

Current-mode Analog-to-Digital Converter (ADC) has drawn many attentions due to its high operating speed, power and ground noise immunity, and etc. However, 2n - 1 comparators are required in traditional n-bit current-mode ADC design, leading to inevitable high power consumption and large chip area. In this work, we propose a low power and compact current mode Multi-Threshold Comparator (MTC) based on giant Spin Hall Effect (SHE). The two threshold currents of the proposed SHE-MTC are 200μA and 250μA with 1ns switching time, respectively. The proposed current-mode hybrid spin-CMOS flash ADC based on SHE-MTC reduces the number of comparators almost by half (2n-1), thus correspondingly reducing the required current mirror branches, total power consumption and chip area. Moreover, due to the non-volatility of SHE-MTC, the front-end analog circuits can be switched off when it is not required to further increase power efficiency. The device dynamics of SHE-MTC is simulated using a numerical device model based on Landau-Lifshitz-Gilbert (LLG) equation with Spin-Transfer Torque (STT) term and SHE term. The device-circuit co-simulation in SPICE (45nm CMOS technology) have shown that the average power dissipation of proposed ADC is 1.9mW, operating at 500MS/s with 1.2 V power supply. The INL and DNL are in the range of 0.23LSB and 0.32LSB, respectively.

Original languageEnglish (US)
Title of host publicationISLPED 2016 - Proceedings of the 2016 International Symposium on Low Power Electronics and Design
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages314-319
Number of pages6
ISBN (Electronic)9781450341851
DOIs
StatePublished - Aug 8 2016
Externally publishedYes
Event21st IEEE/ACM International Symposium on Low Power Electronics and Design, ISLPED 2016 - San Francisco, United States
Duration: Aug 8 2016Aug 10 2016

Publication series

NameProceedings of the International Symposium on Low Power Electronics and Design
ISSN (Print)1533-4678

Conference

Conference21st IEEE/ACM International Symposium on Low Power Electronics and Design, ISLPED 2016
CountryUnited States
CitySan Francisco
Period8/8/168/10/16

Keywords

  • Flash ADC
  • multi-threshold Comparator
  • Spin Hall Effect

ASJC Scopus subject areas

  • Engineering(all)

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