Patent ID: 8432145

Claim:
A voltage supply circuit, comprising: a depletion mode III-nitride based high electron mobility transistor (HEMT) having a first power electrode connected to a voltage bus and having a pinch-off voltage; an output capacitor connected between a second power electrode of said depletion mode III-nitride based HEMT and ground, said output capacitor being charged while said depletion mode III-nitride based HEMT is in an ON state; a pulse width generating gate controller configured to provide a control signal to a gate of said depletion mode III-nitride based HEMT; a resistor coupling said gate of said depletion mode III-nitride based HEMT to ground; and an output node between said output capacitor and said second power electrode of said depletion mode III-nitride based HEMT to provide a desired output voltage; wherein said pulse width generating gate controller is operable to adjust said desired output voltage away from said pinch-off voltage using said control signal.