Patent ID: 7752348

Claim:
A motherboard for supporting different types of memories, comprising: a first slot mounting a first type of memory, the first slot comprising a ground terminal generating a ground signal when the first type of memory is mounted therein; a second slot mounting a second type of memory, the second slot comprising a ground terminal generating the ground signal when the second type of memory is mounted therein, wherein the first memory and the second memory are alternatively mounted on the motherboard; and a voltage regulating circuit electronically connected to the first slot and the second slot to detect which type of memory is mounted on the motherboard by receiving the ground signal generated by the slots, and output voltages suitable for the detected type of memory mounted on the motherboard, the voltage regulating circuit comprising: a feedback circuit receiving the ground signal from the ground terminal of the first slot or the second slot and outputting a constant feedback voltage according to the ground signal; a controller comprising a feedback terminal to receive the constant feedback voltage and an output terminal to output a first voltage to the first slot or the second slot; and a linear voltage regulator comprising an input terminal to receive the first voltage from the output terminal of the controller and convert the first voltage to a second voltage, and an output terminal to output the second voltage to the first slot or the second slot.