Patent ID: 7872527

Claim:
User equipment comprising: a switching regulator having a regulator control voltage input, wherein the switching regulator is configured to receive an input voltage and to produce an output voltage dependent on a first signal applied to the regulator control voltage input; a linear regulator coupled to the switching regulator and configured to receive the output voltage and produce a time-varying operating voltage; a power amplifier coupled to the linear regulator and configured to produce a RF output signal having an RF output power controlled the time-varying operating voltage; a temperature sensing device configured to determine an indication of an operating temperature; an analog to digital converter configured to receive the input voltage and to determine a digital representation of the input voltage; a look up table storing a set of adjustment values according to the input voltage and the operating temperature; and a control module configured to receive the digital representation of the input voltage and the indication of the operating temperature and configured to determine the first signal based on the input voltage, the operating temperature and a set of adjustment values stored in the look up table.