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The current diagnostic technique for melanoma solely relies on the surface level of skin and under-skin information is neglected. Since physiological features of skin such as melanin are closely related to development of melanoma, the non-linear physiological feature extraction model based on random forest regression is proposed. The proposed model characterizes the concentration of eumelanin and...
A GaN based highly integrated Solid State Power Amplifier (SSPA) is developed for S-band radar applications. The power amplifier delivers more than 1 KW within a 400 MHz bandwidth with 55 dB gain and a typical 34% PAE. The SSPA includes a negative voltage supply, sequential bias circuit, and temperature sensor circuit. Its compact and lightweight design is suitable for many radar applications.
One of the recent trends in multimode multiband (MMMB) receivers is to remove the analog filter or variable-gain amplifier (VGA) in the receiver chain and employ a wide-dynamic-range ADC directly after the mixer or include the mixer in the ADC. While such architecture provides ease of programmability once the signals are digitized, it puts a large burden on the ADC and anti-alias filter. Hence, ADCs...
Low-power-drain VHF amplifiers have some unique characteristics when they are miniaturized. And, if the design is special??requiring tight tolerances or intended for limited-quantity production??it is often desirable to make the RF micropower circuits from discrete components. Described in this article are the first-order device requirements and circuit considerations for such VHF amplifiers incorporating...
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