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Wearable/implantable devices, e.g., heart-rate-monitor straps and implanted wireless sensors, need to be ultra-low-power (ULP), compact, and also robust against the proximity effect, which can significantly degrade the antenna and front-end performance and hence battery lifetime. A fully integrated adaptive front-end with a tunable matching network (TMN) using low-power and fast impedance detection...
A 2.4GHz transceiver SoC, operating at minimum 0.9V, is presented as a power-efficient and cost-effective solution for the coming Internet of Things (IoT) platform. The transceiver is compliant with Bluetooth Low Energy (BLE) 4.0/4.2/5.0 PHY and 802.15.4 standards. The measured sensitivity is −93dBm at 1V, and TX output power is 1dBm. Direct battery attachment is feasible, due to the 1.5µW deep-sleep...
This paper presents fast start-up techniques for duty cycled Impulse Radio receivers. Three different techniques are used to improve the start-up time of individual blocks. DC coupling between the mixer and the VGA is used to ensure a fast start-up time for the whole chain, resulting in an overall start-up time below 10ns. This is the fastest startup time reported for duty cycled Impulse Radio receivers...
This paper presents a 4bit SAR ADC for ultra-low energy radios. It is not obvious to maintain good power-efficiency for low resolution, low data rate ADCs given fixed overhead and scaling limitations. Nevertheless, an excellent FOM of 25fJ/conversion-step is achieved by using a dedicated capacitor implementation, asynchronous dynamic logic, an optimized layout and a reduced power supply. The prototype...
Self-calibration for imaging sensors is essential to many computer vision applications. In this paper, a novel algorithm based on multiple view self-calibration and metric reconstruction is proposed for structured light system. In the method, the camera is implemented in three different positions to acquire images. This algorithm can be applied in various occasions with its simple calculation and...
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