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The performance of free-space optical (FSO) communications that using an optical amplifier (OA) in the scheme of an amplify-received (AR)-relaying has a major drawback in the detection of input signal quality under the effects of turbulence. As an OA is based on a fiber-detection (FD) method to receive and delivers a signal at the amplification process stage, there is an opportunity to implement an...
Battery energy capacity in an application system is determined by the amount of electrical energy spent to the load and time consumption. The system reliability depends on the supply of electrical energy from the battery as the power source. The energy capacity of the battery will ensure the services provided by the unit device or equipment. As an example, the UPS system provides clean, conditioned,...
Over the past seven years, the coherent digital optical transmission enables a new generation of high speed optical communication. Coherent transmission technologies have delivered improvement in the capacity-reach product for long-haul fiber optic transmission systems. The coherent digital optical transmission is able to reach bit rates up to 100 Gbit/s. One of the keys of the ideal coherent optical...
In this research, the concurrent multiband LNA that works at four frequency centers of 950 MHz, 1.85 GHz, 2.35 GHz, and 2.65 GHz will be designed and analyzed. The multiband LNA uses transistor HJ-FET NE3210S01 in cascode structure with self bias and inductive degeneration topology with resonator LC. The performances of multiband LNA are simulated by Advance Design System (ADS). It is shown from the...
Radio-Frequency Identification (RFID) has become a technology segment that growth rapidly in data collecting industry and automatic identification. One of the most important part of RFID system is power amplifier that enable power transfer between reader and transponder for identification purpose. This research is proposed power amplifier class E for RFID application at frequency of 13.56 MHz. It...
Charger is an important part in e-car. For a massive number of e-cars in the future, battery charger should have characteristics of high efficiency, rapid charging capability, portability, low-cost and compatible with the national standar electricity. In order to cover thus five parameters, the battery charger design should be transformerless, employing buck swith converting method, and having a microprocessor...
Operation speed of the single-photon detector based on the silicon-on-insulator (SOI) metal-oxide-semiconductor field-effect transistor (MOSFET) is affected by the noise and minority carrier lifetime, both of which are found to be dependent on the substrate bias. The noise spectrum are obtained at various substrate voltages in dark condition while keeping the average drain current constant. The noise...
Optoelectrical method to evaluate the lifetime of single holes in SOI MOSFET is presented, in which the device is illuminated with a continuous light and the histograms of the digitized drain current is analyzed. It was found that smaller number of holes and the higher transverse electric field greatly enhance the hole lifetime.
The interoperable capabilities between the mixed WLAN standards in the environment of hybrid network are subject to be discussed. In this case, the extended fiber link may achieve 21.7 km. Among the modulations and the access methods applied, it shows that the delay bound of 802.11g DSSS-OFDM 54 Mbps is reasonable, however, it offer the highest data rate.
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