Bipolar junction transistor, and a method of forming a charge control structure for a bipolar junction transistor
A charge control structure is provided for a bipolar junction transistor to control the charge distribution in the depletion region extending into the bulk collector region when the collector-base junction is reverse-biased. The charge control structure comprises a lateral field plate above the uppe...
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| creator | Tooher, Shane Coyne, Edward John Geary, Shane Patrick Brannick, Alan O'Sullivan, Catriona Marie Ó hAnnaidh, Breandán Pol Og |
| description | A charge control structure is provided for a bipolar junction transistor to control the charge distribution in the depletion region extending into the bulk collector region when the collector-base junction is reverse-biased. The charge control structure comprises a lateral field plate above the upper surface of the collector and dielectrically isolated from the upper surface of the collector and a vertical field plate which is at a side of the collector and is dielectrically isolated from the side of the collector. The charge in the depletion region extending into the collector is coupled to the base as well as the field-plates in the charge-control structure, instead of only being coupled to the base of the bipolar junction transistor. In this way, a bipolar junction transistor is provided where the dependence of collector current on the collector-base voltage, also known as Early effect, can be reduced. |
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The charge control structure comprises a lateral field plate above the upper surface of the collector and dielectrically isolated from the upper surface of the collector and a vertical field plate which is at a side of the collector and is dielectrically isolated from the side of the collector. The charge in the depletion region extending into the collector is coupled to the base as well as the field-plates in the charge-control structure, instead of only being coupled to the base of the bipolar junction transistor. In this way, a bipolar junction transistor is provided where the dependence of collector current on the collector-base voltage, also known as Early effect, can be reduced.</abstract><oa>free_for_read</oa></addata></record> |
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| title | Bipolar junction transistor, and a method of forming a charge control structure for a bipolar junction transistor |
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