An Ultra-Low-Voltage Single-Crystal Oscillator-Timer (XO-Timer) Delivering 16-MHz and 32.258-kHz Clocks for Sub-0.5-V Energy-Harvesting BLE Radios in 28-nm CMOS

A timer for ultra - low - power applications and variability in sub - threshold

Timer for Ultra-Low-Power Wireless Sensor Node Synchronization

Recent work in ultra-low-power sensor platforms has enabled a number of new applications in medical, infrastructure, and environmental monitoring. Due to their limited energy storage volume, these sensors operate with long idle times and ultra-low standby power ranging from 10s of nW down to 100s of pW [12]. Since radio transmission is relatively expensive, even at the lowest reported power of ...

An Ultra-Low Voltage CMOS Voltage Controlled Oscillator with Process and Temperature Compensation

Process and temperature variations have become a serious concern for ultra-low voltage (ULV) technology. The clock generator is the essential component for the ULV very-large-scale integration (VLSI). MOSFETs that are operated in the sub-threshold region are widely applied for ULV technology. However, MOSFETs at subthreshold region have relatively high variations with process and temperature. I...

Piezoelectric Transformers for Ultra-low Voltage Energy Harvesting Applications ¬リニ

This work shows the possibility to exploit piezoelectric transformers (PTs) for implementing step-up oscillators for ultra-low DC voltage energy harvesting (EH) applications. Oscillation is achieved by coupling a common source stage made up of nchannel JFETs with a piezoelectric transformer acting like a high gain notch filter. A voltage doubler is used to store energy in a capacitor. A mathema...

An ultra-low-voltage ultra-low-power CMOS active mixer

The scaling of CMOS technology has greatly influenced the design of analog and radio-frequency circuits. In particular, as technology advances, due to the use of lower supply voltage the available voltage headroom is decreased. In this paper, after a brief overview of conventional low-power CMOS active mixer structures, we introduce an active mixer structure with sub-mW-level power consumption ...