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A lateral power MOSFET with the extended trench gate is proposed in this letter. The polysilicon gate electrode is extended to the substrate, which improves the breakdown voltage (BV) and specific on-resistance (Ron). It indicates by simulation that the Ron of 1.86mΩ.cm2 with a BV of 174V in the proposed structure is nearly 53% less than the Ron of 3.96mΩ.cm2 with a BV of 126V in the typical structure.
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