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A novel multi-finger power SiGe heterojunction bipolar transistor (HBT) with non-uniform finger length and non-uniform finger spacing was proposed to improve the thermal stability. Thermal simulation for a ten-finger power SiGe HBT with novel structure was conducted with ANSYS software. Three-dimensional temperature distribution on emitter fingers was obtained. Compared with traditional structure power SiGe HBT, the maximum junction temperature of novel structure reduce significantly from 416.1K to 412K, the thermal resistance reduce from 154.8K/W to 149K/W, temperature distribution were significantly improved. Thermal stability was effective enhanced. ©2010 IEEE.
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