Method for data converter sample clock distribution
First Claim
Patent Images
1. A communication system comprising:
- a host unit comprising;
a first module having a first oscillator configured to generate a first master clock signal having an amplitude-to-noise floor ratio that is insufficient to achieve a desired jitter level; and
a plurality of second modules coupled to the first module to receive the first master clock signal, each of the plurality of second modules having a first filter to filter the first master clock signal such that the amplitude-to-noise floor ratio is increased sufficiently to achieve the desired jitter level, and a first converter configured to use the filtered first master clock signal rather than a clock signal generated in the respective second module in converting between analog and digital signals;
a transport mechanism; and
at least one remote unit distributed in a coverage area, the at least one remote unit communicatively coupled to the host unit via the transport mechanism, wherein the at least one remote unit comprises;
a third module having a second oscillator configured to generate a second master clock signal having an amplitude-to-noise floor ratio that is insufficient to achieve the desired jitter level; and
a plurality of fourth modules coupled to the third module to receive the second master clock signal, each of the plurality of fourth modules having a second filter to filter the second master clock signal such that the amplitude-to-noise floor ratio is increased sufficiently to achieve the desired jitter level, and a second converter configured to use the filtered second master clock signal rather than a clock signal generated in the respective fourth module in converting between analog and digital signals.
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Abstract
A unit for use in a communication system comprises a communication module having an oscillator configured to generate a master clock signal; a plurality of conversion modules; and a distribution component configured to distribute the master clock signal from the communication module to each of the plurality of conversion modules. Each of the plurality of conversion modules comprises a filter configured to filter the master clock signal; and a converter configured to use the filtered master clock signal in converting between analog and digital signals.
68 Citations
30 Claims
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1. A communication system comprising:
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a host unit comprising; a first module having a first oscillator configured to generate a first master clock signal having an amplitude-to-noise floor ratio that is insufficient to achieve a desired jitter level; and a plurality of second modules coupled to the first module to receive the first master clock signal, each of the plurality of second modules having a first filter to filter the first master clock signal such that the amplitude-to-noise floor ratio is increased sufficiently to achieve the desired jitter level, and a first converter configured to use the filtered first master clock signal rather than a clock signal generated in the respective second module in converting between analog and digital signals; a transport mechanism; and at least one remote unit distributed in a coverage area, the at least one remote unit communicatively coupled to the host unit via the transport mechanism, wherein the at least one remote unit comprises; a third module having a second oscillator configured to generate a second master clock signal having an amplitude-to-noise floor ratio that is insufficient to achieve the desired jitter level; and a plurality of fourth modules coupled to the third module to receive the second master clock signal, each of the plurality of fourth modules having a second filter to filter the second master clock signal such that the amplitude-to-noise floor ratio is increased sufficiently to achieve the desired jitter level, and a second converter configured to use the filtered second master clock signal rather than a clock signal generated in the respective fourth module in converting between analog and digital signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A unit for use in a communication system, the unit comprising:
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a communication module having an oscillator configured to generate a master clock signal having an amplitude-to-noise floor ratio that is insufficient to achieve a desired jitter level; a plurality of conversion modules; and a distribution component configured to distribute the master clock signal from the communication module to each of the plurality of conversion modules; wherein each of the plurality of conversion modules comprises; a filter configured to filter the master clock signal such that the amplitude to-noise floor ratio is increased sufficiently to achieve the desired jitter level; and
a converter configured to use the filtered master clock signal rather than a clock signal generated in the respective conversion module in converting between analog and digital signals. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A unit for use in a communication system, the unit comprising:
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means for generating a master clock signal in a first module, the master clock signal having an amplitude-to-noise floor ratio that is insufficient to achieve a desired jitter level; means for distributing the master clock signal to a plurality of second modules; means for filtering the master clock signal in each of the plurality of second modules such that the amplitude to-noise floor ratio is increased sufficiently to achieve the desired jitter level; and means for converting between digital and analog signals using the filtered master clock signal in each of the plurality of second modules rather than a clock signal generated in each of the respective second modules. - View Dependent Claims (20)
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21. A conversion module comprising:
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a connector configured to receive a master clock signal having an amplitude-to-noise floor ratio that is insufficient to achieve a desired jitter level; a filter configured to filter the received master clock signal such that the amplitude to-noise floor ratio is increased sufficiently to achieve the desired jitter level; and a converter configured to use the filtered master clock signal in converting between analog and digital signals rather than a clock signal generated in the conversion module. - View Dependent Claims (22, 23, 24, 25)
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26. A method of using a master clock signal in a communication unit, the method comprising:
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generating the master clock signal in a first module, the master clock signal having an amplitude-to-noise floor ratio that is insufficient to achieve a desired jitter level; transmitting the master clock signal to each of a plurality of second modules; filtering the master clock signal in each of the plurality of second modules such that the amplitude to-noise floor ratio is increased sufficiently to achieve the desired jitter level; and converting between analog and digital signals based on the filtered master clock signal rather than on a clock signal generated in each of the respective second modules. - View Dependent Claims (27, 28, 29, 30)
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Specification