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This paper presents a low power voltage limiter design that avoids possible damages in the circuits of the analog front-end of the RFID sensor due to voltage surges whenever reader and tag are very close. The proposed voltage limiter design takes advantage of the implemented bandgap reference and voltage regulator in order to provide low temperature and process deviation of the limiting voltage. The...
A low-power invasive blood pressure transducer has been designed. It is based on a structure of four high resistive strain gauges in a full Wheatstone bridge configuration. For obtaining the required sensitivity, the gauge was allocated performing a careful mechanical simulation of the membrane behaviour. The electronic conditioning circuit and the ADC were optimized to compensate the noise introduced...
The number of elderly people in European population is becoming higher year after year, thus, increasing the number of people affected by neurodegenerative diseases. The early diagnosis and treatment of these patients is a critical aspect yet not covered in depth. In this paper we propose a novel system for the monitorization of gait of patients affected by Parkinson disease (PD). Force Sensitive...
This paper explores the benefits that can be achieved for stereoscopic visualization when using occlusion culling strategies. The virtual environments analysed in this paper are complex mechanical sets that are not densely occluded. Those which are built up by dense geometric sets like aerospace engines composed of thousands of components and millions of polygons. The algorithm uses occlusion queries...
Although the insertion of a sensor in a full passive UHF RFID tag for long range is a challenge itself, the main goals of this paper are discussing the real constraints of RFID tags and providing the design criteria to optimize the different blocks in order to achieve long distances. The design has been focused on the matching network, the voltage multiplier, the ASK demodulator, the load modulator...
Virtual environments using haptic devices have proved useful for assembly/disassembly simulation of mechanical components. To date most haptic virtual environments are stand-alone. Collaborative haptic virtual environments (CHVEs) are distributed across a number of users via a network, such as the Internet. These present new challenges to the designer, such as consistency of the virtual environments,...
In passive UHF RFID transponders, a storage capacitor is used to supply the tag's subsystems. A quick charge of the storage capacitor and a sufficient supply voltage for the subsystems are intended for proper operation, thus using a voltage sensor. This paper presents two adjustable very low power consumption voltage sensor circuits for the supply capacitor in passive UHF RFID transponders. The proposed...
A highly integrated, low power GALILEO/GPS front-end for the new generation of positioning services has been designed using a 0.35 mum SiGe process. It has been implemented using a 6 MHz bandwidth low IF architecture whose IF frequency is 4 MHz approximately. The front-end exhibits a voltage gain of 103 dB and present a SSB noise figure of 3.7 dB which makes it suitable for high sensitivity applications...
This paper presents two very low-power consumption voltage-sensor circuits for the supply capacitor in passive UHF RFID transponders. The proposed circuits are key points in a battery-life-free RFID tag, by sensing the charge stored in a supply capacitor, and enabling the rest of the system when enough charge is available. In comparison to previous published circuits, the average current of our circuits...
Occlusion culling proves to be useful for the interactive visualization of environments that are not densely occluded. Those which are built up by dense geometric sets like aerospace engines composed of thousands of components and millions of polygons. In first place the convenience of using occlusion culling is studied with a simple scheme. Then improvements are analyzed. The key points to obtain...
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