Challenged claims of Microchip Technology’s patent that describes a USB voltage regulator that has a large gm current buffer driver added between a first stage of an operation amplifier and a last stage power transistor are unpatentable as obvious over prior art, the Patent Trial and Appeal Board said, in an inter partes review by Aptiv Services US. The board determined that the challenged claims are obvious over prior art that describes an LDO to manage power in portable devices, discloses a fast disable/enable bias control circuit that is very suitable for fast disabling and subsequent fast enabling of the ...
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