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This paper presents a new protection scheme for AC zonal distribution system proposed for future marine power systems based on active impedance estimation. This technique actively imposes small transient disturbances onto the system at a point of measurement to excite the system in real time and estimate the system impedance over a broad frequency range at that point. The identified impedance can...
A major demand of the aviation industry is the reduction of emissions in combination with cost efficiency improvement. One possible approach to face this challenge is the replacement of the conventional auxiliary power unit by a fuel cell system within a “more electric aircraft” design. In order to integrate a fuel cell system into the grid architecture of modern aircraft new protection arrangements...
This work presents a new systematic approach to design impedance measurement systems for living cell detection and monitoring. The hardware of the system was implemented in PCBs as a proof-of-concept. A DAC channel generates the required excitation signals to be applied onto the living cell and the current flowing through the cell is converted into voltage and digitized by an ADC channel. An FPGA...
This paper reports an integrated CMOS potentiostat for detection of heavy metal ions in water and other solvents based on electrochemical sensing. The proposed potentiostat features a low input impedance, high sensitivity, high gain and low power transimpedance amplifier front end, with programmable control of electrode potential, thus facilitating continuous bi-directional measurement of reduction-oxidation...
Linearity characteristics in terms of two-tone third order intermodulation distortion (IMD3) for common-emitter (CE) SiGe heterojunction bipolar transistors (HBT) are investigated at high frequency (6 GHz) with impedance matched for maximum output power. An approach to enhancing the linearity of SiGe HBTs at their high input power levels through the use of current bias instead of voltage bias is presented...
This paper describes a novel fully integrated circuit implemented in standard 0.35 ??m CMOS technology dedicated to biological signal measurement such as ECG or EEG signals. Based on a new CMOS current conveyor (a low power 60 ??A @ ??1.5 V power supply, 88 ?? 100 ??m2 area, 100 MHz bandwidth and 10 GHz equivalent GBW circuit) the instrumentation amplifier used in this IC has a weaker offset and a...
This paper describes properties of monolithic W-band IMPATT oscillator, their integration into SIMMWICs and proves their basics functionality as mW power sources for simple cost effective and flexible mm-wave systems. In this oscillator system monolithic integrated IMPATT diodes are combined with coplanar waveguide resonator on unthinned silicon wafers for mm-wave operation (around 90 GHz).
This paper describes a methodology to measure the low-frequency noise of InP-based transistors. These transistors have demonstrated transition frequencies (ft) greater than 200 GHz, generally achieved at current densities in excess of 200 kA/cm2. Depending on the DC current gain, this may represent base currents of some mA. For the first time, curves of Sib, Sic and Sibic for base currents of up to...
Device testing using an IEC-compliant hand-held 150 pF/330 Omega discharge gun was compared to a 50 Omega IEC waveform pulser. Current waveforms were recorded and components tested with both pulsers. To understand effects of different pulse source impedances, the 50 Omega pulser was modified to operate at 100 and 330 Omega delivery impedances.
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