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A Hybrid Spin-CMOS Flash ADC based on Spin Hall Effect and Spin Transfer Torque

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In this paper, a 3-bit hybrid spin-CMOS Flash analog to digital converter (ADC) is developed, which works based on switching of perpendicular-anisotropy magnetic tunnel junctions (p-MTJs) using both spin Hall effect (SHE) and spin-transfer torque (STT). The structure consists of unconnected p-MTJs in which heavy metals (HMs) are implemented with different cross-sectional areas leading to devices with different critical current (IC) values. IC values act as reference currents (Iref) eliminating the need for transistors with different sizes creating various values of Iref. Moreover, the power-hungry comparators in complementary metal-oxide-semiconductor (CMOS) Flash ADC can be replaced with p-MTJs because they compare the input current (Iin) with their IC. Hence, this approach can reduce the chip area and the mismatch issue as compared to the conventional CMOS Flash ADC. In this structure, a copy of Iin passes through the HM of each p-MTJ, which improves the tunnel magnetoresistance (TMR) and as a results increasing the reading reliability, linearity, and speed of spin Hall-based ADCs with attached HMs. The simulation results in 180nm CMOS technology show 845 μW of power consumption at 200 MS/s with the differential nonlinearity (DNL) and integral nonlinearity (INL) of -0.149 LSB (least significant bit) and 0.085 LSB, respectively.

TitelProceedings - 2022 IEEE 40th International Conference on Computer Design, ICCD 2022
Antal sider4
Udgivelsesårokt. 2022
ISBN (Elektronisk)9781665461863
StatusUdgivet - okt. 2022
Begivenhed40th IEEE International Conference on Computer Design, ICCD 2022 - Olympic Valley, USA
Varighed: 23 okt. 202226 okt. 2022


Konference40th IEEE International Conference on Computer Design, ICCD 2022
ByOlympic Valley
SerietitelProceedings - IEEE International Conference on Computer Design: VLSI in Computers and Processors

Bibliografisk note

Funding Information:
This work was supported by the Marie Sklodowska Curie Individual Fellowship (IF) for the SHADE project under the contract number of 897733.

Publisher Copyright:
© 2022 IEEE.

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