Patent ID: 7672398

Claim:
A method of adjusting characteristics of a real signal path and an imaginary signal path over which a modem respectively outputs in-phase (I) and quadrature (Q) signal components, the method comprising: disabling the imaginary signal path; applying a first reference signal to the real signal path; receiving and storing a first detected reading having a value P I-TARGET in response to the first reference signal; disabling the real signal path; enabling the imaginary signal path and applying a second reference signal to the imaginary signal path; receiving a second detected reading having a value P Q in response to the second reference signal; comparing the value of P I-TARGET to the value of P Q ; and on a condition that the values of P I-TARGET and P Q are not substantially the same, adjusting the amplitude characteristics of the imaginary signal path until the values of P I-TARGET and P Q are substantially the same.