Measurement method and arrangement for amplitude and phase synchronization in a polar transmitter

A method and arrangement is shown for measuring an indicator of delay mismatch between a phase information path and an amplitude information path of a polar modulator. In the solution according to the invention a substantially sinusoidal measurement signal is injected both into the amplitude information path and into the phase information path. An indicator of the delay mismatch is obtained by measuring a quantity that is proportional to a difference between power represented by a lower side band of a spectrum of a polar modulated signal and power represented by an upper side band of the spectrum.