Signal generator, signal generating system and signal generating method

The invention provides a signal generator, a signal generating system and a signal generating method, wherein an arbitrary waveform can be repeatedly generated and the first and last phases of the waveform are continuous without changing the waveform frequency. The signal generator (10, 11, 12) comprises a phase shifter (30). The phase shifter receives the data of a waveform being outputted repeatedly n times and then shifts the sampled data of the waveform at a phase shift amount of phi n corresponding to the repeated n times. Finally, the phase shifter outputs the data to a D/A conversion member, wherein the last end of the waveform data of n-1 times and the first end of the waveform data of n times are in continuous change in phase.