Patent ID: 7813444

Claim:
A measurement arrangement comprising: a signal generator configured to feed a first measurement signal having a substantially sinusoidal alternating component into an amplitude information path of a polar modulator and to feed a second measurement signal having a substantially sinusoidal alternating component into a phase information path of the polar modulator, the alternating component of said first measurement signal and the alternating component of said second measurement signal having the same frequency, wherein the signal generator is configured to produce said first measurement signal and said second measurement signal so that the alternating component of said first measurement signal and the alternating component of said second measurement signal have a phase shift having a pre-determined value; a measurement circuitry configured to measure an indicator of delay mismatch as a quantity proportional to a difference between power represented by a lower side band of a spectrum of an output signal of the polar modulator and power represented by an upper side band of said spectrum, said delay mismatch being a difference between a propagation delay on the amplitude information path of the polar modulator and a propagation delay on the phase information path of the polar modulator so that said quantity includes a sign of said difference between the propagation delay on the amplitude information path of the polar modulator and the propagation delay on the phase information path of the polar modulator; and a processor configured to cause the signal generator and the measurement circuitry to perform successive measurements to produce a plurality of indicators corresponding with a plurality of values of the frequency associated with the alternating component of said first measurement signal and the alternating component of said second measurement signal.