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This paper presents a PLL-assisted crystal oscillator using a current switching phase detector (PD) with intrinsic 90° phase offset for IoT applications. The PLL provides accurate pulse injection timing into the XO, sustaining its oscillation at only 100mV amplitude and ensuring robustness operation across PVT. This technique achieves high energy injection efficiency and avoids the use of power hungry...
Thermal sensing is one of the most commonly desired features in IoT devices to monitor either environmental or system/chip conditions. An accurate temperature sensor usually requires carefully calibrated, high-accuracy ADCs, which prevents their use in ultra-low-power sensor nodes. In some sensing architectures, a highly accurate timing reference can replace the ADC [1]. With this in mind, we observe...
Size of STI wells is another significant factor to affect the stress magnitude (device mobility) besides size of transistor active regions. In this paper, we present a technique for improving device mobility in the critical path via global STI well width adjusting following the chip placement stage. The methodology formulates the original device mobility enhancement problem as a series of convex geometric...
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