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We propose an on-chip bias temperature instabilities (BTI) monitor by using standard cell based unbalanced ring-oscillator (RO). The monitor consists of NAND and NOR with extremely large difference in drive strength, which enables 4.2x sensitivity to BTI compared with normal INV based RO. This originates not only from accentuation of the degraded stage with small drive strength by the dominant delay...
An embedded SRAM power management scheme using 16 nm FinFET technology is demonstrated in automotive infotainment SoCs. By introducing write-assist circuit technique, SRAM can operate down to 0.5 V wide voltage range, achieving DVFS for efficient power saving. Fast resume standby mode is also developed for reducing the leakage power of L1 cache under 2 GHz CPU operation. We confirmed that proposed...
We propose an on-die aging monitor based on ring-oscillator (RO) which measures bias-temperature-instabilities (BTI) and AC hot-carrier-infection (HCI). The monitor consists of a symmetric RO (SRO) and an asymmetric RO (ASRO). The effect of NBTI and PBTI can be separated by focusing on the difference in sensitivity observed in SRO and ASRO under DC stress condition. In addition, the speed degradation...
This paper presents power management and low power techniques of our heterogeneous quad/octa-core mobile application processor (AP). This AP has a combination of high-performance 2 GHz cores and energy-efficient 1 GHz cores. The maximum performance in the octa-core configuration is 35,600 DMIPS. The key design highlights are as follows. 1) Using a dedicated PLL and H-tree clock in the high-performance...
Moderate overdrive of the supply voltage rather reduces total powers at high temperatures, which enables GHz design overcoming thermal runaway. We have examined the way in which reliability issues such as negative bias temperature instability (NBTI) and hot carrier injection (HCI) affect the product performance. 1) The high temperature and voltage acceleration test on 45nm products has revealed that...
The worldwide demand for high-performance mobile or car infotainment application processors (AP) is increasing. This demand coexists with the need for low power to achieve long battery life and avoid thermal runaway. A heterogeneous CPU configuration is an effective solution. The proposed heterogeneous quad/octa-core AP has a combination of high-performance 2GHz cores and energy-efficient 1GHz cores...
We propose a dynamic voltage-drop sensor, which is fully digital so that it is easy to design into products and use for testing. The 2.4K-gate GHz sensor exploits the difference in the voltage sensitivity between two paths composed of different types of standard cells. We have fabricated a test chip in a 28-nm HKMG process and confirmed its feasibility. This sensor can be used to evaluate optimal...
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