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Electronic Circuits for Wireless Optical LANs - I
Rui L. Aguiar; António Tavares; José Luis Cura; Eduardo de Vasconcelos; Luis Nero Alves; Rui Valadas; Dinis M. SantosThis is the first of two papers discussing practical issues and results on the implementation of low-cost transceivers for several wireless optical LANs, covering most physical layer elements.Target optical LANs under consideration have bit-rates varying between 4Mbps and 25Mbps, and input photodiode capacitance may vary between 10pF and 50pF. PPM modulation, either in a 4-PPM or 1...
Electronic Circuits for Wireless Optical LANs - II
Rui L. Aguiar; António Tavares; José Luis Cura; Eduardo de Vasconcelos; Luis Nero Alves; Rui Valadas; Dinis M. SantosThis is the second of two papers discussing practical issues and results on the implementation of low-cost transceivers for several wireless optical LANs, covering most physical layer elements.Target optical LANs under consideration have bit-rates varying between 4Mbps and 25Mbps, and input photodiode capacitance may vary between 10pF and 50pF. PPM modulation, either in a 4-PPM or ...
A CMOS Signal to Noise Measurement Circuit for Infrared Sectored Receivers
Luís Nero Alves; Rui L. Aguiar; Dinis M. SantosThis paper describes a circuit able to measure Signal to Noise ratios developed for Infrared applications.The Signal to Noise ratio is of major importance in IR Sectored Receivers because it provides the basis of selection or combining of signals coming from different optical sectors. This circuit estimates the ratio of the average optical signal sensed in the photo-detector and the ave...
Proton Microprobe
Dinis M. Santos; J. Sousa LopesThis thesis discusxes electronic instrumentation designed and built with a specific application in mind, namely, the application of induced X-ray emission (PIXE) to the qualitative and quantitative analysis materials.The physical principles upon which PIXE is based are briefly reviewed and a short description of the experimental arrangement - particle accelerator and peripheral equipment - where the instru...
Delay analysis of a current source CMOS inverter for use in voltage controlled ...
José L. Cura; Dinis M. SantosAn analysis is performed on the operation of a modified current-source loaded inverter, showing that the proposed modification leads to a more linear characteristic, in terms of delay versus control voltage, than the one obtained with traditional current-starved inverters. A delay cell designed around this inverter is presented. The proposed circuit is intended to be used as a delay of the cell in function of p...
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