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為何GaN HEMT沒有雪崩擊穿?
Release date:2023-04-13
Writer:
Category:Technical Article
Views:547次
GaN有很高的擊穿場強(硅的10倍)
就硅器件而言,高電場導(dǎo)致硅PN結(jié)出現(xiàn)雪崩擊穿
GaN HEMT 更像瓷片電容擊穿,因為它的擊穿點常常位于器件上部的絕緣層中(電場最集中的地方)
與硅不同之處在于,氮化鎵一旦發(fā)生擊穿,就是永久性的
對氮化鎵而言,通常的設(shè)計余量會有30%以上,而硅器件僅有10%
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寄生電容: GaN和硅超結(jié)MOS對比
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