Abstract-properties of Silicon Carbide Junction Field EffectTransistor (SiC JFET) such as high switching speed, low forward voltage drop and high temperature operation have attracted the interest of power electronic researchers and technologists, who for many years developed devices based on Silicon (Si). A number of power system Engineers have made efforts to develop more robust equipment including circuits or modules with higher power density. However, it was realized that several available power semiconductor devices were approaching theoretical limits offered by Si material with respect to capability to block high voltage, provide low on-state voltage drop and switch at high frequencies. This paper presents an overview of the current applications of SiC JFET in circuits such as inverters, rectifiers and amplifiers. Other areas of application reviewed include; usage of the SiC JFET in pulse signal circuits and boost converters. Efforts directed toward mitigating the observed increase in electromagnetic interference were also discussed. It also presented some areas for further research, such as having more applications of SiC JFET in harsh, high temperature environment. More work is needed with regards to SiC JFET drivers so as to ensure stable and reliable operation, and reduction in the prices of SiC JFETs through mass production by industries.

The number of users of the Global System of Mobile Telecommunications (GSM) in the world is growing at an exponential rate; with more than 146 million users in Nigeria alone. There is a continuous need to install GSM supporting infrastructure to take care of increasing users in terms of service delivery. As at December 2013, the number of base transceiver stations (BTS) was 28,289; whereas by projection Nigeria needs additional 33,000 BTSs by 2018. However, there are serious technical challenges militating rapid installation of base stations, such as environmental congestion, high capital expenditure (CAPEX), multiple regulations and taxation, anti- competitive practices among a number of operators. In order to address these challenges, infrastructure sharing has been proposed, and adopted by some GSM operators. This paper presents an overview of GSM infrastructure sharing.