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The terahertz (THz) imaging enhanced with compact diffractive lenses and sensitive room temperature THz detectors was demonstrated to be suitable for carcinoma zones screening in bio-tissues. Optical transmission of the dehydrated histological sections with a colon cancer was measured with close to wavelength-limited spatial resolution at 0.6 THz frequencies. High number of the explicit areas where...
A compact THz imaging system was developed for the adenocarcinoma-affected human colon tissues measurement simultaneously in transmission and reflection geometry. The contrast between the cancer and control tissues fixed in paraffin at 0.6 THz frequency was up to 23%.
A versatile and compact solid state THz radar system operating in the continuous wave mode is described. A frequency-modulated electronic THz source is used for target illumination. On the receiver side a THz sensor array is employed to increase imaging performance. The system's performance is evaluated and application examples are shown.
Properties of antenna-coupled microbolometers optimized for room temperature 300 GHz and 600 GHz resonant frequency detection is reported. Dipole antenna placed on freestanding SiN membrane is used to couple THz radiation power to the titanium-based thermo-resistor. We demonstrate that antenna-coupled micro-bolometers can be well suited for beam profile imaging of the THz pulses emitted by the photoconductive...
Silicon carbide (SiC) MOSFETs are about to replace conventional silicon-based power switches. Due to their blocking, thermal, conducting and switching characteristics they represent a better solution for high power and high voltage applications, such as automotive motor drives in hybrid electric vehicle. Operating conditions and advantages of using SiC MOSFET in a typical automotive motor drive application...
The increasing trend of DC/AC induction motor converters implementation in a wide range of driving applications is becoming a fact that could not be neglected any more. This fact challenges the designers of the DC/AC induction motor converters to constantly seek performance improvements and cost reductions on an everyday basis. The paper describes some of the design improvements of a DC/AC induction...
Performance of the antenna-coupled detectors was measured by the quasi-optical setup in wide frequency range from 0.1 to 1.0 THz. Studied sensors were based on the titanium microbolometers coupled with the double-dipole- or log-periodic-type antenna for room temperature THz detection. The THz radiation of the selectively filtered broadband LTG-GaAs photoconductive emitter and the system generating...
This paper focuses on an ASIC design for power MOSFET driver with an intelligent current driving technique which optimizes the performance and efficiency of driving single or more in parallel connected power MOSFETs. The efficient and robust driving of the power MOSFET gate is, besides the current driving techniques, also supported with the adjustable rise and fall times parameters of the driving...
A new concept of magnetic microsystem design is proposed to increase the dynamic range and absolute accuracy. The measured result on the realized microsystem of the noise density is better than 80 nT/radic(Hz) in frequency range from DC to 10 kHz. The absolute accuracy is obtained by integrated continuous autocalibration.
A new method of overvoltage protection in the supply path of CMOS circuits is described. The central device of the protection circuit is a CMOS-compatible npn bipolar transistor (BJT) which uses no n+ buried layer and can be manufactured in a simple p-well CMOS process without additional process steps. The device is especially suitable for high-voltage applications in electrically hostile environments...
The basis for the automation of mixed analog/digital ASIC (application-specific integrated circuit) design is a method previously proposed by the authors. The essence of the method is the introduction of so-called personalized cells, which are optimized to fit the specific needs of the current design. A deterministic method for operational amplifier and layout compilation is presented. In addition,...
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