Patent ID: 8138801

Claim:
A multiband communications device with a system for matching a signal (compClk) with an unknown frequency to a particular frequency band, the system comprising: a plurality of selectable frequency sources collectively covering a range of frequency bands, where each frequency source supplies a reference clock within a corresponding frequency band; a high frequency window sampler having an input to accept a compClk signal with an unknown frequency, and input to accept a reference clock from a selected frequency source, and an output to supply a first frequency pattern detector output signal (fpdOut_ 1 ) indicating that the frequency of the compClk is greater than the reference clock frequency; a low frequency window sampler having an input to accept the compClk signal, and input to accept the reference clock, and an output to supply a second frequency pattern detector output signal (fpdOut_ 2 ) indicating that the frequency of the compClk is less than the reference clock frequency; and, a tuning module having an output to select a frequency source, and inputs to accept the fpdOut_ 1 and fpdOut_ 2 signals, the tuning module determining if the compClk frequency coarsely matches the reference clock frequency of a selected frequency source and supplying a frequency band matching signal at an output in response to determining the coarse match.