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This work was motivated by the idea to monitor the input impedance of differential front-ends of passive RFID-transponders depending on their power-consumption. Different methods readily available in state-of-the-art network analyzers are compared with regard to the special demands imposed by passive RFID front-ends. At this the correct stimulation of the DUT appears to be the major issue of conventional...
The NMOS and PMOS gate cross-connected bridge rectifier has been proved an efficient way to realize the power extraction for passive RFID applications. In this paper, such a rectifier has been analyzed from its different state during the period of the RF input signal. The calculations reveal the essence of this circuit and some useful relations are calculated and plotted by MATLAB. With these relations...
An ultra-low-power four-channel sensor interface for wireless sensor networks employing semi-active RFID transponders as sensor nodes is described in the present paper. Each channel is based on a self-contained switched-capacitor second-order single-bit SigmaDelta-modulator operated in an incremental manner. The power consumption can be regulated through variation of the sampling frequency (max. 1...
RFID transponder systems including ID and sensor functionality conquer more and more new application areas. Especially passive transponders with integrated sensors represent miniaturized and autonomous functionalities. That can be used in industry for process monitoring or automation. Just as well complex and implantable diagnostic systems are available in e.g. medical engineering using that technology...
The need for suitable analog front-ends in microsystems, in particular for future RFID-sensor systems, entirely based on organic field-effect transistors (OFETs) is addressed in this paper. Microsystems are mixed-signal systems having one or more sensors, analog conditioning stages and a digital subsystem. The integration of such a complex unit posses formidable problems particularly to the analog...
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