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Temperature-based adaptive memory sub-system in 28nm UTBB FDSOI | IEEE Conference Publication | IEEE Xplore

Temperature-based adaptive memory sub-system in 28nm UTBB FDSOI


Abstract:

Temperature plays a crucial role in deciding SRAM performance especially at very low voltage. SRAM bitcell has conflicting constraints of write-ability and stability at c...Show More

Abstract:

Temperature plays a crucial role in deciding SRAM performance especially at very low voltage. SRAM bitcell has conflicting constraints of write-ability and stability at cold (−40°C typically) and hot temperature (125°C typically) respectively. In order to reduce SRAM minimum operating voltage (VMIN), write and stability assist schemes are deployed. Fully-Depleted SOI (FDSOI) technology offers single P-well SRAM bitcell, where a single voltage can be used to adjust the state of the body (or P-well) of all bitcell devices. This voltage can vary from −1.1V to +1.1V. In this paper, we present detailed architecture and implementation of the low-power adaptive memory sub-system that modulates body bias voltage based on the junction temperature to reduce SRAM VMIN. The body is biased to positive voltages up to +1.1V to boost write-ability at cold temperatures and up to −1.1V to boost stability at hot temperatures. In addition, the system selects appropriate assist scheme based on temperature information. We present the dynamic simulation based functional verification environment using temperature and voltage-aware memory models that are compliant with IEEE 1801. We gained 50mV in SRAM VMIN thereby allowing 0.55V operation using high density 0.120μm2 single P-well bitcell in 28nm planar Ultra-Thin Box and Body (UTBB) FDSOI CMOS technology. We also gained 18% dynamic power during regular temperature range of 10°C and 75°C. In addition, due to forward body bias at cold temperature, we gained 30% in SRAM access time.
Date of Conference: 22-25 May 2016
Date Added to IEEE Xplore: 11 August 2016
ISBN Information:
Electronic ISSN: 2379-447X
Conference Location: Montreal, QC, Canada

References

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