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This paper presents a design of 0.6 V class-AB voltage follower (VF) using 0.13 µm CMOS technology. The follower is developed based on the super source follower (SSF) using bulk-driven and quasi-floating gate (QFG) techniques. The proposed VF can operate at low voltage without DC level shift between the input and output terminals. The simulation results show the total harmonic of 0.3 % for an input/output...
This paper presents an accuracy of a modified UTD solution for a convex impedance cylinder based on the general 3D UTD solution for a smooth convex perfectly electric conductor (PEC) scattering problem. By employing the impedance boundary condition (IBC), the modified UTD solution for a convex impedance cylinder can be used for the material-coated PEC cylinder problem. Thus, the modified UTD solution...
Passive RFID is a promising technology for products tracking in logistics. However, the UHF RFID tag is greatly affected by backside goods especially metallic object. This paper describes the design of a dipole antenna with Electromagnetic Band Gap (EBG) for RFID tag, so that the tag could still work on metallic surface. The design of EBG material for UHF RFID is operated at 922 MHz and its reflection...
In implantable stimulators, a current-controlled stimulation is preferred over a voltage-controlled due to its safety. However, the power efficiency is a major disadvantage. By reducing the headroom voltage needed in the current driver, power efficiency of a constant current stimulation is improved. A promising technique is to bias the transistor in triode region whereas improving output impedance...
This paper presents a compact ultrawideband monopole antenna with 5.5 GHz notched band. By inserting V-shaped slit into the patch of UWB antenna, the notched band is obtained. The V-shaped slit length corresponds to a half guide wavelength of center frequency of band notch. The proposed antenna can rejects the frequencies from 5.3 GHz – 5.65 GHz, resulting in avoidance of electromagnetic interference...
This paper proposes a reduced network equivalence in order to fasten the computation of short-circuit currents only within the sub-area of interest, connected to the large power system. The proposed method has been verified on the modified IEEE 24-bus reliability test system and the modified EGAT 243-transmission system. The numerical results evidently show that this method gives acceptable estimates...
This paper proposes the design of an algorithm to detect fault in underground cable for blocking auto-reclosing in distribution feeder of Metropolitan Electricity Authority (MEA). The algorithm consists of two major steps. First, overcurrent detection algorithm is applied to compare fault current with current setting. Next process, the impedance detection is used to identify the fault location base...
Thin film sputtering on the desired substrate is one of an industrial application that needs to split atoms of sputter gas, such as Argon (Ar), to ions and electrons. This can be done by plasma driven circuit that delivers a high frequency sinusoidal current waveform to the sputtering machine. For the reason of high efficiency (more than 70% at 100 – 500 W) with high frequency sinusoidal current waveform,...
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