Self-tunable phase lock loop
First Claim
1. A phase lock loop comprising:
- a digital storage to store information relating to a first desired frequency;
an oscillator to provide an oscillator frequency; and
a frequency generator circuit capable of producing at least one control signal based on said information relating to said first desired frequency in said digital storage, wherein said frequency generator circuit causes said oscillator to adapt the oscillator frequency based on said first desired frequency in response to a trigger signal by determining a change in said at least one control signal using said digital storage and selectively updating said information relating to said first desired frequency in said digital storage.
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Accused Products
Abstract
The present invention provides a method and an apparatus for selectively pretuning and updating a phase lock loop, deployed in an integrated circuit including an agile radio, such as a wideband or an ultra wideband frequency agile radio in a telecommunication system, for example, a reconfigurable multiband and/or multistandard mobile communication system. In one embodiment, a phase lock loop may comprise a digital storage having a first desired frequency. An oscillator may provide an oscillator frequency and a frequency generator circuit capable of producing at least one control signal may cause the oscillator to adapt the oscillator frequency based on the first desired frequency in response to a trigger signal. A pretune unit may apply a pretune voltage to a tuning element to cause the oscillator to calibrate the oscillator frequency to the first desired frequency. An output voltage may be added at the output of a loop filter to the pretune voltage to tune the output voltage of the loop filter such that to set the oscillator frequency substantially at the first desired frequency. An update unit may automatically determine whether one or more parameters of a phase lock loop unit have changed to dynamically update the pretune voltage.
16 Citations
25 Claims
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1. A phase lock loop comprising:
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a digital storage to store information relating to a first desired frequency; an oscillator to provide an oscillator frequency; and a frequency generator circuit capable of producing at least one control signal based on said information relating to said first desired frequency in said digital storage, wherein said frequency generator circuit causes said oscillator to adapt the oscillator frequency based on said first desired frequency in response to a trigger signal by determining a change in said at least one control signal using said digital storage and selectively updating said information relating to said first desired frequency in said digital storage. - View Dependent Claims (2, 3, 4, 5)
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6. An integrated circuit comprising:
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a phase lock loop unit including a loop filter having an output and an oscillator with an associated tuning element to provide an oscillator frequency, and a digital storage to store information relating to a plurality of desired frequencies for tuning the oscillator frequency; and a frequency generator circuit including an adder having an output, said frequency generator circuit coupled to said phase lock loop unit for determining a change in at least one control signal using said digital storage and selectively updating said information relating to a desired frequency in said digital storage, said frequency generator circuit including; a pretune unit to apply a pretune voltage to said tuning element to cause said oscillator to calibrate the oscillator frequency to the desired frequency, wherein said adder is configured to add an output voltage at the output of said loop filter to the pretune voltage to tune the output voltage of said loop filter such that to set the oscillator frequency substantially at the desired frequency, and an update unit coupled to said pretune unit to automatically determine whether one or more parameters of said phase lock loop unit have changed to dynamically update the pretune voltage. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A telecommunication system comprising:
an agile radio having a phase lock loop including; a digital storage to store information relating to a plurality of desired frequencies including a first and a second desired frequency and to hold information relating to one or more actual valid control voltages/currents to adapt said phase lock loop; an oscillator coupled to said digital storage; a self-calibrating frequency generator circuit to steer said oscillator to said first desired frequency of said plurality of desired frequencies in response to a trigger signal by determining a change in at least one control signal using said digital storage and selectively updating said information relating to said first desired frequency in said digital storage for tuning an oscillator frequency based on a change in one or more characteristics of said oscillator; and a control logic to provide the trigger signal to cause at least one of pretuning said phase lock loop to said second desired frequency of said plurality of desired frequencies and updating of said information relating to one or more actual valid control voltages/currents in said digital storage with a new actual valid control voltage/current of said oscillator. - View Dependent Claims (18, 19)
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20. A method for selectively pretuning and updating a phase lock loop, the method comprising:
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storing information relating to a plurality of desired frequencies including a first and a second desired frequency to adapt said phase lock loop; holding one or more actual valid control voltages/currents to enable a self-calibration in said phase lock loop when generating said plurality of desired frequencies; and in response to a trigger signal, steering an oscillator associated with said phase lock loop to said first desired frequency of said plurality of desired frequencies and determining a change in at least one control signal based on said stored information relating to said first desired frequency and selectively updating said information relating to said first desired frequency. - View Dependent Claims (21, 22, 23)
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24. An apparatus for selectively pretuning and updating a phase lock loop, the apparatus comprising:
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means for storing information relating to a plurality of desired frequencies including a first and a second desired frequency to adapt said phase lock loop; means for holding one or more actual valid control voltages/currents to enable a self-calibration in said phase lock loop when generating said plurality of desired frequencies; and means for steering an oscillator associated with said phase lock loop to said first desired frequency of said plurality of desired frequencies in response to a trigger and determining a change in at least one control signal using said digital storage and selectively updating said information relating to said first desired frequency. - View Dependent Claims (25)
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Specification