Shift control circuit and wireless device

A wireless device comprising:

• a shift control circuit that outputs an information signal to be applied to frequency modulation;
• a modulator that performs frequency modulation of changing a frequency of a carrier wave in accordance with a signal level of the information signal;
• and
• a transmitter that produces a transmission signal from the carrier wave frequency-modulated by the modulator, and transmits the produced signal via an antenna,
• wherein:
• the shift control circuit comprises:
• a first limiter circuit that limits an amplitude of an input control target signal to be equal to or less than a first threshold;
• a phase shifter that shifts, for the control target signal having the amplitude limited by the first limiter circuit to be equal to or less than the first threshold, a phase of a frequency component within a predetermined first frequency range by a predetermined amount;
• a first suppressor that suppresses, for the control target signal phase-shifted by the phase shifter, the frequency component equal to or greater than a second threshold;
• and
• a reducer that suppresses, for any of (i) the control target signal having the amplitude limited by the first limiter circuit to be equal to or less than the first threshold, (ii) the control target signal phase-shifted by the phase shifter, and (iii) the control target signal having the frequency component equal to or greater than the second threshold and suppressed by the first suppressor, a frequency component within a predetermined second frequency range, and thus reducing a wave height value of the information signal, and
• the shift control circuit outputs the information signal that is the control target signal having the frequency component equal to or greater than the second threshold and suppressed by the first suppressor or the control target signal having the frequency component within the second frequency range and suppressed by the reducer.