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Due to the high switching speed of SiC MOSFET, the parasitic parameters and the low damping in the circuit, the turn-off overvoltage and oscillation of the freewheeling diode and SiC MOSFET are very severe. Based on the terminal impedances during the turn-off transition of the freewheeling diode and SiC MOSFET, the mechanism of the turn-off overvoltage and oscillation are analyzed and the suppressing...
Non-isolated Weinberg Converter is suitable for battery discharge regulator due to the advantages of continuous current, no RHP zeroes and high efficiency. The working principle under overlap and non-overlap modes with stray parameters is analyzed in this paper. In order to estimate the heat distribution, the power loss is calculated and the trend of change in efficiency is achieved. In addition,...
To extend a carrier mobility improvement by strain engineering in high-density and small-gate-space complementary metal-oxide-semiconductor (CMOS) circuits, we have proposed a new stress memorization technique (SMT) that uses a strain proximity free technique (SPFT) to demonstrate the mobility improvement through multiple strain-gate engineering. The electron mobility of n-channel metal-oxide-semiconductor...
In this paper, we demonstrate TaN/fluorinated HfO2 CMOS devices, focusing on symmetry and asymmetry fluorine incorporation at top or bottom HfO2 interfaces. 16% permittivity enhancement, 65% and 91% mobility increases for electron and hole, respectively, under high electric field was achieved. Reliability of n- and p-MOSFET was improved 3 orders and 8% for GIDL and hot carrier immunity, respectively...
Magnetic amplifier is a simple and high efficiency post regulator in auxiliary output of the multiple output power supplies. The Schottky diodes must be replaced by synchronous rectifiers (SRs) in low voltage output converters to improve the efficiency. In this paper, a new gate-driver scheme is proposed to maximize the efficiency of the synchronous rectifiers combined with magnetic amplifier post...
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