Patent ID: 8175549

Claim:
A method of IQ calibration for use in a radio frequency (RF) transmitter, said method comprising the steps of: transmitting a plurality of calibration signals and detecting a corresponding power output to generate a plurality of power detection signals thereby; estimating a gain mismatch and a phase mismatch based on differences of said plurality of power detection signals; updating an IQ correction matrix based on said gain mismatch estimate and said phase mismatch estimate; and repeating said steps of transmitting, detecting, estimating and updating until a desired convergence is reached, wherein said plurality of power detection signals comprises: a first power signal P 1 =α 2 ; a second power signal P 2 =1; a third power signal P 3 = 1 2 ⁢ ( a 2 + 1 + sin ⁡ ( 2 ⁢ φ ) ) ; a fourth power signal P 4 = 1 2 ⁢ ( a 2 + 1 - sin ⁡ ( 2 ⁢ φ ) ) ; and wherein α denotes gain mismatch and φ denotes phase mismatch.