Title :
Temperature-adaptive dynamic voltage scaling for high temperature energy efficiency in subthreshold memory banks
Author :
Kumar, Ranjith ; Kursun, Volkan
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Wisconsin - Madison, Madison, WI
Abstract :
Static random access memory (SRAM) circuits optimized for minimum energy consumption typically operate in the subthreshold regime with ultra-low power-supply-voltages. Both the read and the write propagation delays of a subthreshold memory circuit are significantly reduced with an increase in the die temperature. The excessive timing slack observed in the clock period of constant-frequency subthreshold memory circuits at elevated temperatures provides new opportunities to lower the active mode energy consumption. Temperature-adaptive dynamic supply voltage tuning technique is proposed in this paper to reduce the high temperature energy consumption of ultra-low-voltage subthreshold SRAM arrays. Results with a 64-bit times 64-bit memory array in the TSMC 180 nm CMOS technology indicate that the energy consumption can be lowered by up to 32.8% by dynamically scaling the supply voltage at elevated temperatures.
Keywords :
CMOS memory circuits; SRAM chips; circuit optimisation; embedded systems; low-power electronics; SRAM arrays design; TSMC CMOS technology; active mode energy consumption; constant-frequency subthreshold memory banks; die temperature; high temperature energy efficiency; minimum energy consumption; read propagation delays; size 180 nm; static random access memory circuits optimization; temperature-adaptive dynamic supply voltage tuning technique; ultra-low power-supply-voltage operation; write propagation delays; CMOS technology; Circuits; Dynamic voltage scaling; Energy consumption; Energy efficiency; Propagation delay; Random access memory; Read-write memory; SRAM chips; Temperature;
Conference_Titel :
Circuits and Systems, 2008. MWSCAS 2008. 51st Midwest Symposium on
Conference_Location :
Knoxville, TN
Print_ISBN :
978-1-4244-2166-4
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2008.4616861