Patent ID: 7649345

Claim:
A power supply integrated circuit comprising: a first module that outputs electrical power at an output voltage level; a second module that receives a power supply reference signal and a signal indicative of the output voltage level and outputs a power supply error signal, wherein the power supply error signal is based, at least in part, on the difference between the power supply reference signal and the signal indicative of the output voltage level; a third module that receives the power supply error signal, digitally processes the power supply error signal, and outputs a power supply control signal that is based, at least in part, on the digitally processed power supply error signal; and a fourth module that monitors the electrical voltage output from the first module and outputs the signal indicative of the output voltage level; wherein the first module receives the power supply control signal and outputs the electrical power based, at least in part, on the power supply control signal; wherein the third module comprises: a digital filter that outputs a first signal characterized by a first number of digital bits; and a sigma delta module, communicatively coupled to the digital filter, that receives the first signal and outputs a second signal representative of the first signal, where the second signal is characterized by a second number of bits that is less than the first number of bits.