Multi-phase voltage regulator on motherboard

A motherboard comprising:

• a pulse width modulation control unit for generating N counts of pulse signals in a first cycle period;
• a pulse signal extension circuit for receiving the N counts of pulse signals in a second cycle period and dividing the N counts of pulse signals into M counts of pulse signals, wherein M=N.times.2.sup.K, K is a positive integer, and the second cycle period is 2.sup.K times the first cycle period;
• M counts of current providing paths for generating corresponding M counts of output currents and corresponding M counts of sensing voltages in response to the M counts of pulse signals from the pulse signal extension circuit;
• a feedback signal switching circuit for successively switching the M counts of sensing voltages into N counts of sensing voltages;
• a power layer connected to the M counts of current providing paths for receiving the M counts of output currents, thereby providing a core voltage;
• and
• a central processing unit for receiving the core voltage.