Patent ID: 8489045

Claim:
A method for maintaining a constant transmission output power across temperature variations in a wireless communication device, comprising: selectively entering a calibration mode in response to a transmission downtime in the device; enabling a loopback path between a transmitter circuit and a receiver circuit in the device during the calibration mode; transmitting a test signal from the transmitter circuit, along the loopback path through the receiver circuit, to a test circuit; measuring a distortion product for the test signal; deriving a power correction value from the distortion product; measuring an operating temperature of the device; and storing the power correction value associated with the operating temperature in a look-up table, wherein measuring the distortion product comprises: measuring a difference between a first transmission power at a first gain level and a second transmission power at a second gain level; and selecting one of the first and second gain levels for calibration in response to the measured difference between the first transmission power and the second transmission power.