Analog Devices,inc.

George Francis Clernon

Brian Anthony Moane

Patrick J Meehan

A control circuit (,) for controlling a FET (,) for outputting a 3.3 volt or a regulated 1.5 volt output to an AGP bus on a PC motherboard in response to a TYPEDET signal being applied to a control terminal (,) of the control circuit (,) through an input (,) of a voltage divider circuit (,). The TYPEDET signal is received from a video card receiving slot and indicates the type of video card in the slot of the motherboard. An amplifier (,) outputs a control signal to the gate of the FET (,) for either disabling the FET (,), or enabling the FET (,) to output the 1.5 volt or the 3.3 volt outputs. A decoding circuit (,) decodes the state of the control terminal (,) and controls the amplifier (,) to disable the FET (,) during power up. When the TYPEDET signal of zero volts, the FET (,) is operated to output the 1.5 regulated voltage output. When the TYPEDET signal is floating, the FET (,) outputs the 3.3 source voltage. When the voltage on the control terminal (,) is not connected to the voltage divider circuit (,), the FET (,) is operated to output the 1.5 regulated voltage.

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Dooradoyle, Ireland

George Francis Clernon