Apparatus for generating multiple clock signals of different frequency characteristics
First Claim
1. Apparatus for generating a plurality of radio frequency clock signals, for use by a plurality of application modules including at least one wireless communication module that comprises transmitter and receiver means for wireless communication and further application modules said clock signals having respective clock frequency characteristics and including at least first and second clock frequencies that are not integral multiples nor sub-multiples of each other nor of a third frequency, said apparatus comprising reference frequency means and fractional-N phase-locked loop frequency synthesizer means responsive to said reference frequency means, and automatic frequency control means for adjusting clock frequencies relative to received signals, wherein said reference frequency means is arranged to supply a common reference frequency signal to a plurality of said fractional-N phase-locked loop frequency synthesizer means that supply said first and second clock frequencies respectively for said application modules said apparatus comprising selective activation means for selectively activating and de-activating at least one of said plurality of phase lock loop means as required by the corresponding application module or modules, and at least one of said frequency synthesizer means having a synchronisation value different from the synchronisation value of the other frequency synthesizer means.
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Accused Products
Abstract
A terminal includes at least one wireless communication application module (1) and a plurality of further application modules (4, 5, 6, 8). Multiple radio frequency clock signals are generated for the different modules having respective clock frequency characteristics and including at least first and second clock frequencies that are not integral multiples nor sub-multiples of each other nor of a third frequency. The clock generation comprises reference frequency means (14), fractional-N phase-locked loop frequency synthesizer means (15) responsive to the reference frequency means, and different automatic frequency control means for adjusting clock frequencies relative to received signals.
The reference frequency means (14) is arranged to supply a common reference frequency signal to a plurality of the fractional-N phase-locked loop frequency synthesizer means (17, 18, 19, 25, 26, 41,42) that supply the first and second clock frequencies respectively for the application modules. Selective activation means (30,52) selectively activates and de-activates the phase lock loop means as required by the corresponding application module or modules.
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Citations
25 Claims
- 1. Apparatus for generating a plurality of radio frequency clock signals, for use by a plurality of application modules including at least one wireless communication module that comprises transmitter and receiver means for wireless communication and further application modules said clock signals having respective clock frequency characteristics and including at least first and second clock frequencies that are not integral multiples nor sub-multiples of each other nor of a third frequency, said apparatus comprising reference frequency means and fractional-N phase-locked loop frequency synthesizer means responsive to said reference frequency means, and automatic frequency control means for adjusting clock frequencies relative to received signals, wherein said reference frequency means is arranged to supply a common reference frequency signal to a plurality of said fractional-N phase-locked loop frequency synthesizer means that supply said first and second clock frequencies respectively for said application modules said apparatus comprising selective activation means for selectively activating and de-activating at least one of said plurality of phase lock loop means as required by the corresponding application module or modules, and at least one of said frequency synthesizer means having a synchronisation value different from the synchronisation value of the other frequency synthesizer means.
- 2. Apparatus for generating a plurality of radio frequency clock signals, for use by a plurality of application modules including at least one wireless communication module that comprises transmitter and receiver means for wireless communication and further application modules said clock signals having respective clock frequency characteristics and including at least first and second clock frequencies that are not integral multiples nor sub-multiples of each other nor of a third frequency, said apparatus comprising reference frequency means and fractional-N phase-locked loop frequency synthesizer means responsive to said reference frequency means, and automatic frequency control means for adjusting clock frequencies relative to received signals, wherein said reference frequency means arranged to supply a common reference frequency signal to a plurality of said fractional-N phase-locked loop frequency synthesizer means that supply said first and second clock frequencies respectively for said application modules said apparatus comprising selective activation means for selectively activating and de-activating at least one of said plurality of phase lock loop means as required by the corresponding application module or modules, and wherein at least one of said frequency synthesizer means produces a reference frequency without synchronising the corresponding clock signal with a frequency of a received wireless communication signal.
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14. (cancelled)
Specification