Mobile wireless set with improved intermittent operation control and reduced power consumption

A mobile wireless set for receiving an arriving call, comprising:

• a receiving unit for demodulating a receiving signal to output a sound signal and a control signal, said control signal consisting of a plurality of words in each frame;
• a frequency synthesizer, including a phase locked loop, for supplying in response to the level of a control voltage of said phase locked loop, an output signal having a frequency generated by said phase locked loop to said receiving unit;
• a control unit for receiving said control signal and for informing said frequency synthesizer of the frequency to be generated and for storing a number of predetermined words specifying a time period for stabilizing the output frequency of said frequency synthesizer;
• intermittent signal generating means, included in said control unit, for generating, during a waiting state for waiting said arriving call, an intermittent signal corresponding to said control signal, said intermittent signal being turned ON only during one period in each frame of said control signal corresponding to said time period specified by said number of predetermined words stored in said control unit;
• and
• an intermittent control unit, included in said frequency synthesizer, for turning ON or OFF, in response to the ON or OFF of said intermittent signal, a power supply for at least part of said phase locked loop, and for holding, when said intermittent signal is OFF, the level of the control voltage of said phase locked loop at the same level as that existing at the time immediately before said power supply is turned OFF in response to said intermittent signal.