Patent ID: 7804342

Claim:
A differential signal driven direct-current voltage generating device for integration to a circuit system for generating an output of a direct-current (DC) voltage in response to a pump-up enable signal and a pump-down enable signal, which comprises: a charge pump unit, which is capable of being driven by the pump-up enable signal and the pump-down enable signal to generate an output of a charge pump voltage; a loop filter unit, which is capable of performing a loop filtering operation on the output of the charge pump unit to thereby generate an output of a loop-filtered voltage; a voltage doubler unit, which is capable of performing an amplitude doubling operation on the output of the loop filter unit to thereby generate an output of an amplitude doubled voltage; and a spur filter unit, which is capable of performing a spur filtering operation on the output of the voltage doubler unit to thereby generate a spur filtered voltage which is used to serve as the output of the differential signal driven direct-current voltage generating device.