Power transformers are one of the main equipment in power production, with high cost and long manufacturing time. If a fault occurs during supply process, it will prevent normal operation system result no electricity available to users. One factors affecting safe is short circuit fault, faults at outlet substations or close proximity can also pose serious threat transformers. This article simul...

This paper presents a usage of Maple program for electric and electronic circuit analysis. The special package PraCAn has been used for this purpose. This contribution introduces possibilities of the package for circuit linearization and following ac symbolic or semisymbolic analyses. Simplification of the active part models is done by their instance parameters to obtain useful results for domi...

In this paper, an ultra-low-noise amplifier with frequency band switching capability is designed, simulated and fabricated. The two frequency ranges of this amplifier consist of the 2.4 to 2.5 GHz and 3.1 GHz to 3.15 GHz frequency bands. The designed amplifier has a noise figure of less than 1dB, a minimum gain of 23 dB and a VSWR of less than 2 in the whole frequency band. The design process s...