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A low-energy 8-bit charge-redistribution SAR ADC for wireless sensor nodes is proposed. The ADC employs a new capacitor switching procedure that allows a reduction of the average switching energy as compared to previous proposals. Simulation and measurement results of a test chip prototype operating at 100 kS/s are provided, showing a SFDR of 55.63 dB for a power consumption of 2.17 μW. The active...
An on-chip frequency reference is designed for low-power, low-cost, and fully integrated system-on-chip designs. In this relaxation oscillator, pseudodifferential architecture is used to eliminate frequency variation caused by bias current, and interleaving capacitors are implemented to extend its discharge time. A low-leakage programmable switch array (PSA) trimming method is proposed to calibrate...
A class AB power amplifier (PA) with output power digital controllability for WSNs is implemented in 65nm CMOS technology. The programmable output power is realized by altering the number of working cells and adjusting the load through a tunable matching network, which can increase the back-off efficiency significantly. Dummy FETs are used for neutralization to increase reverse isolation. The measurement...
A 7-bit 26MS/s SAR (successive approximation register) ADC is presented in this paper for the application of ZigBee receiver. Compared to the conventional method, the set-and-down method reduces the average switching energy by around 80%. Dynamic comparator is chosen to diminish the signal-dependent offset caused by the non-fixed input common-mode voltage. A prototype ADC was implemented in a CMOS...
This paper presents a low-power speed-scalable 8bit Successive Approximation Register (SAR) ADC implemented in 0.18-μm CMOS. By designing a compact asynchronous controller and a charge-sharing DAC, the power consumption can be linearly scaled with the conversion speed. A maximum power dissipation of 28.4 μW and 0.019 mm2 total area make this ADC ideal for highly integrated wireless sensor nodes. The...
A 5th-order Chebyshev active RC complex filter for wireless sensor networks with automatic frequency tuning is presented in this paper. This filter is synthesized from 5th-order low-pass LC prototype, and designed using leapfrog structure. An automatic frequency tuning is used to prevent the deviation of the RC constant of the filter. This filter is fabricated in TSMC 0.18μm CMOS process. The measurement...
Based on TSMC 0.18μm 1P6M RF CMOS process, a 4th-order Butterworth analog low-pass filter (LPF) used in the transmitting link of 2.4GHz Wireless Sensor Network (WSN) radio frequency (RF) front-end is designed in this paper. In this design, active-gm-RC structure is derived, and it can achieve the same low consumption performance as the gm-C structure while have better linearity than that of the gm...
A novel remote localization system utilizing renewable solar energy to power and trigger communication between end devices and a wireless network is presented. The novelty of the system is the unique node design that allows for battery less operation using ambient solar energy. Hardware and software design considerations involved in making the localization system operational inspite of the limitations...
Low power, small volume and high acquisition precision are always important in the internal module of wireless implantable neural recording system. This paper describes the design and implementation of a new successive approximation (SAR) ADC to meet the unique requirements of wireless implantable neural recording system. In the designed new ADC, a fully differential structure is used to avoid the...
In this paper, we present the first ever wireless ldquoBattery-less Solar Powered Wireless Tagrdquo that can also communicate with wireless sensor networks for the first time reported. This RFID is based on the hardware/software codesign of five different technologies, and could set the foundation of ubiquitous ultra-low-cost RFID networks and the first generation of ldquogreenrdquo RF electronics...
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