Multiple-band mobile transceiver having a smaller number of local oscillators

A mobile transceiver which operates in a plurality of radio frequency bands for each of transmission and reception by switching among different radio frequency bands used by a plurality of mobile communications systems, the mobile transceiver comprising:

• a single voltage-controlled oscillator for producing an oscillation signal having a selected one of frequencies that correspond to the plurality of mobile communications systems;
• and
• a frequency division and distribution section comprising:
• a first group of frequency dividers connected to an output of the voltage-controlled oscillator and having division numbers that are predetermined for the plurality of mobile communications systems;
• a first switch for switching among output signals of the frequency dividers of the first group in accordance with a selected one of the plurality of mobile communications systems;
• a second group of frequency dividers connected to the first switch and having division numbers that are predetermined in accordance with combinations of the plurality of mobile communications systems and the transmission-side local oscillation signal and the reception-side local oscillation signal;
• and
• a second switch for distributing, in accordance with the selected mobile communications system, output signals of the second group of frequency dividers so that said output signals of said second group of frequency dividers serve as a transmission-side local oscillation signal and a reception-side local oscillation signal.

A mobile transceiver which operates in a plurality of radio frequency bands for each of transmission and reception by switching among different radio frequency bands used by a plurality of mobile communications systems, the mobile transceiver comprising:

• a single voltage-controlled oscillator for producing an oscillation signal having a selected one of frequencies that correspond to the plurality of mobile communications systems;
• and
• a frequency division and distribution section comprising:
• frequency dividers connected to an output of the voltage-controlled oscillator and provided in a number equal to the number of all combinations of the plurality of mobile communications systems and the transmission-side local oscillation signal and the reception-side local oscillation signal, the frequency dividers having division numbers that are predetermined for the respective combinations;
• and
• at least one switch for selecting and distributing part of output signals of the frequency dividers for selected combinations of the plurality of mobile communications systems and a transmission-side local oscillation signal and a reception-side local oscillation signal.