Abstract text

A switch-modulator (15) for a radio-frequency power amplifier, arranged to modulate the I-signal and the Q-signal of the complex components (I+j.Q) separately in an I-signal part (2a) and a Q-signal part (2b) in order to create a modulated I-signal pulse sequence and a modulated Q-signal pulse sequence, said modulation comprising a time-shift of the pulse positions within a sample interval.