Patent ID: 7039438

Claim:
A multi-mode radio communications device ( 100 ) using a shared clock source ( 110 ), comprising: means for coupling to a crystal ( 110 ) for deriving therefrom an AFC-controlled clock source signal; a reference PLL ( 120 ) for receiving the clock source signal and for deriving therefrom a different clock signal (fovs_RX,fovs_RX) to be delivered to the radio's RX section and/or TX section ( 160 ); and a plurality of accumulator timers ( 150 ) each for maintaining timebase synchronization in a respective one of the multi-modes, wherein each of the plurality of accumulator timers is arranged to use as its increment signal a signal derived from the AFC means and a signal ((1+afc)*Den/Num)) representative of the ratio between the clock source signal frequency and the frequency of its respective one of the multi-modes.