Patent ID: 7449874

Claim:
A voltage regulator system for providing a regulated voltage supply for a digital signal processor, said voltage regulator system comprising: a power supply input node for receiving a power supply input voltage; a regulated voltage output node for providing a switched node pulse width modulated regulated output voltage from a switched mode converter to said digital signal processor, said switched mode pulse width modulated regulated output voltage being provided by a pulse width modulation unit; and a feedback circuit coupled to said switched mode pulse width modulated regulated output voltage node and to a control node of said digital signal processor wherein an input voltage is provided by said control node of said digital signal processor, wherein said feedback circuit further includes a first resistor coupled to a feedback node and to said switched mode pulse width modulated regulated output voltage; and a second resistor coupled to said feedback node and to said control node of said digital signal processor wherein said voltage regulator input node provides a non-zero input voltage, and wherein the regulated output voltage node provides the output voltage (V out ), a voltage reference node V ref receives a reference voltage, the first and second resistors have resistor values of R 1 and R 2 respectively, and the output voltage V out =V ref (1+R 1 /R 2 )−V inC (R 1 /R 2 ) where V inC is the input voltage, and wherein the output voltage V out which provides the regulated voltage supply for the digital signal processor is adjustable responsive to changes in the input voltage V inC by the digital signal procesor such that the output voltage may be set below the level of the internal voltage reference V ref .