APPARATUS AND METHOD FOR OPERATING A PHASE LOCKED LOOP FREQUENCY SYNTHESIZER RESPONSIVE TO RADIO FREQUENCY CHANNEL SPACING

摘要

The present invention relates to an apparatus and method for operating a PLL frequency synthesizer in accordance with radio frequency channel spacing. PLL frequency synthesizer 300 tunes radio frequency transmitter 100 to a radio frequency channel. The processor 110 in the transceiver 100 determines the channel spacing of the radio frequency channels in a portion of the radio frequency band including the radio frequency channels and controls the PLL frequency synthesizer 300 according to the determined channel spacing. The present invention provides a PLL frequency synthesizer 300 with fast settling time and low noise.