9 documents found, page 1 of 1
Single events and century-scale evolution of the northern margin of the Tagus R...
Costa, A.M.; Freitas, M.C.; Inácio, M.; Fatela, F.; Lopes, V.; Andrade, C.; Cachão, M.; Mendes, P.M.; Sarrazola, A.; Macedo, M.; Bettencourt, J.In this work we present preliminary results of the study of one sediment core (EDP1), collected near Cais do Sodré, Lisbon downtown, close to the present day Tagus riverfront. The results allowed differentiation of 4 major sediment units that present a signature of increasing anthropic influence over time. The lowermost unit (Unit 1) corresponds to a subtidal flat accreting in low energy and brackish condition...
A 2.4 GHz wireless electronic shirt for vital signals monitoring
Carmo, João Paulo; Mendes, P.M.; Couto, Carlos; Correia, José H.The paper presents a wireless sensor network for wireless electronic shirts. This allows the monitoring of individual biomedical data, such as the cardio-respiratory function. The solution chosen to transmit the body’s measured signals for further processing was the use of a wireless link, working at the 2.4 GHz ISM band. A radio-frequency (RF) CMOS transceiver chip was designed in the UMC RF 0.18 μm CMOS proce...
Effects of the ESD protections in the behaviour of a 2.4 GHz RF transceiver: pr...
Carmo, João Paulo; Mendes, P.M.; Ribeiro, Fernando; Correia, José H.This paper identifies the main problems related to the Electrostatic Discharge (ESD) in submicron CMOS processes. The mitigation of this problem is made with the use of protections, in order to avoid the destruction of the internal and nput/output circuits connected to the bondingpads. In the 2.4 GHz ISM band, the parallel capacitance and the serial resistance of the ESD protections have effects in the behavior...
A 2.4-GHz low-power/low-voltage wireless plug-and-play module for EEG applications
Carmo, João Paulo; Dias, Nuno; Silva, Hélder; Mendes, P.M.; Couto, Carlos; Correia, José H.This paper presents a plug-and-play module for wireless electroencephalogram (EEG) applications. The wireless module is composed by an electrode, processing electronics, a radio-frequency (RF) transceiver, and an associated antenna. The RF transceiver was fabricated in the UMC RF 0.18 mum CMOS process, and operates in the 2.4-GHz ISM band. The receiver has a sensitivity of -60 dBm and a power consumption of 6.3...
A 2.4-GHz wireless sensor network for smart electronic shirts integration
Carmo, João Paulo; Mendes, P.M.; Afonso, José A.; Couto, Carlos; Correia, José H.A typical sensing module is composed of sensors, interface electronics, a radio-frequency (RF) CMOS transceiver and an associated antenna. A 2.4-GHz RF transceiver chip was fabricated in a UMC 0.18 μm CMOS process. The receiver has a sensibility of -60 dBm and consumes 6.3 mW from a 1.8 V supply. The transmitter delivers an output power of 0 dBm with a power consumption of 11.2 mW. Innovative topics concerning ...
5.7 GHz on-chip antenna/RF CMOS transceiver for wireless sensor networkS
Carmo, João Paulo; Mendes, P.M.; Couto, Carlos; Correia, José H.This paper describes a chip-size antenna for operation at 5.7 GHz, assembled with a low-power, low-voltage RF CMOS transceiver, fabricated in UMC RF CMOS 0.18 μm process. Measurements shown a patch antenna with the central frequency of 5.705 GHz, a bandwidth of 90 MHz at −10 dB of return loss, a directive gain of 0.3 dB, with an efficiency of 18%, and a transceiver with a measured total power consumption of 23 ...
Low-power 2.4-GHz RF transceiver for wireless EEG module plug-and-play
Carmo, João Paulo; Dias, Nuno; Mendes, P.M.; Couto, Carlos; Correia, José H.The paper presents the design and fabrication of a radio-frequency (RF) transceiver fabricated in a UMC RF 0.18 µm CMOS process. The RF transceiver was built to operate at the 2.4 GHz ISM band. The receiver has a sensibility of -60 dBm and consumes 6.3 mW from a 1.8 V supply. The transmitter delivers an output power of 0 dBm with a power consumption of 11.2 mW. The application is a wireless wearable electroence...
A 2.4-GHz RF CMOS transceiver for wireless sensor applications
Carmo, João Paulo; Mendes, P.M.; Couto, Carlos; Correia, José H.The paper describes a radio frequency transceiver designed in UMC RF 0.18 µm CMOS process. This process has a poly and six metal layers, allowing the use of integrated spiral inductors (with a reasonable quality factor), high resistor value (a special layer is available) and a low-power supply of 1.8 V. This RF CMOS transceiver will be applied to implemented a wireless sensors network in a wireless electronic s...
2.4 GHz wireless sensor network for smart electronic shirts
Carmo, João Paulo; Mendes, P.M.; Couto, Carlos; Correia, José H.This paper presents a wireless sensor network for smart electronic shirts. This allows the monitoring of individual biomedical data, such the cardio-respiratory function. The solution chosen to transmit the body’s measured signals for further processing was the use of a wireless link, working at the 2.4 GHz ISM band. A radio-frequency transceiver chip was designed in a UMC RF 0.18 μm CMOS process. The power sup...