Patent ID: 6714772
Filing Date: 2004-03-30
Classification: H03L,H04B

Abstract:
A wireless communication system comprising:a reception system circuit which processes a signal received by an antenna; an oscillation system circuit including a PLL circuit which generates local oscillation signals each merged with the signal processed by said reception system circuit, said PLL circuit having a phase comparator which detects the difference in phase between a frequency signal defined as the reference and a feedback signal, a charge pump which generates a voltage in response to the phase difference detected by said phase comparator, filter capacitors, and a plurality of oscillators which oscillate based on voltages of the filter capacitors; control means which controls said reception system circuit and said oscillation system circuit; and setting means which sets the voltage applied to said each filter capacitor to a predetermined voltage, based on a signal outputted from said control means, when switching is made between said oscillators.