4 documents found, page 1 of 1
A sectored receiver for infrared wireless networks
Alves, L. N.; Aguiar, Rui L.; Vasconcelos, Eduardo de; Cura, Jose LuisThis paper presents an experimental sectored receiver for infrared wireless networks. The receiver comprises two sectors, each with a switched gain front-end and a signal-to-noise ratio estimator. These are then interconnected with a best-sector selector unit, able to compensate the gain switching characteristics of the front-ends. The circuit has been designed in a 0.8 μm CMOS technology.
Electronic circuits for wireless optical LANs - I
Aguiar, Rui L.; Tavares, António; Cura, José Luis; Vasconcelos, Eduardo de; Alves, Luis Nero; Valadas, Rui; Santos, Dinis M.This 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 16-PPM format, istypically use...
Electronic circuits for wireless optical LANs - II
Aguiar, Rui L.; Tavares, António; Cura, José Luis; Vasconcelos, Eduardo de; Alves, Luis Nero; Valadas, Rui; Santos, Dinis M.This 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 16-PPM format, is typically u...
Sistema de transmissão para fibra óptica a 622Mb/s
Sarsfield, António Maria; Vasconcelos, Eduardo de; Aguiar, Rui; Santos, Dinis Magalhães dosThe article discusses the implementation of an optical fiber transmission system, witch suports rates of 622 Mb/s (OC-12). The circuit was developed in a CMOS technology of 1.0μm (ES2). It implements the necessary serial-to-parallel and parallel-to-serial conversions. This ASIC designed in Full Custom is particulary suitable for SONET/SDH (STM-4) based applications.; O artigo discute a implementação de um siste...