Circuit and method for adjusting a digitally controlled oscillator
First Claim
1. A method of comprising:
- deactivating, via a transition controller and during each sub-interval of a transition time, a first frequency of a digitally controlled oscillator (DCO) generating an oscillating signal at the first frequency, the first frequency being a discrete frequency adjustment step of the DCO, the transition controller implemented at least partially in hardware; and
activating, via the transition controller and during each sub-interval of the transition time, a second frequency of the DCO to transition the oscillating signal generated by the DCO from the first frequency to the second frequency over the transition time, the second frequency being another discrete frequency step of the DCO, a first amount of time the first frequency is deactivated and a second amount of time the second frequency is activated progressively increasing during each successive sub-interval of the transition time.
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Abstract
In one embodiment the present invention includes a method of generating an oscillating signal at different frequencies. The method comprises configuring a digitally controlled oscillator (DCO). The DCO is configured to generate the oscillating signal at a first frequency, and the DCO is configured to generate the oscillating signal at a second frequency. Additionally, the DCO is configured to transition from the first frequency to the second frequency during a transition time period. During the transition time period, the DCO activates the second frequency and deactivates the first frequency during a plurality of time intervals. The time intervals for activating the second frequency and deactivating the first frequency successively increase from the beginning of the transition time period to the end of the transition time period.
321 Citations
20 Claims
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1. A method of comprising:
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deactivating, via a transition controller and during each sub-interval of a transition time, a first frequency of a digitally controlled oscillator (DCO) generating an oscillating signal at the first frequency, the first frequency being a discrete frequency adjustment step of the DCO, the transition controller implemented at least partially in hardware; and activating, via the transition controller and during each sub-interval of the transition time, a second frequency of the DCO to transition the oscillating signal generated by the DCO from the first frequency to the second frequency over the transition time, the second frequency being another discrete frequency step of the DCO, a first amount of time the first frequency is deactivated and a second amount of time the second frequency is activated progressively increasing during each successive sub-interval of the transition time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circuit comprising:
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a digitally controlled oscillator (DCO) having multiple frequency steps and configured to generate an oscillating signal based on at least a first frequency or a second frequency of the multiple frequency steps; a transition controller operably coupled with the DCO, the transition controller configured to transition the oscillating signal generated by the DCO from the first frequency to the second frequency by; deactivating, during each successive sub-interval of a transition time, the first frequency of the DCO for a progressively increasing amount of time; and activating, during each successive sub-interval of the transition time, the second frequency of the DCO for another progressively increasing amount of time. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A communication system comprising:
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a mixer to modulate a signal or demodulate a modulated signal based on an oscillating signal; a digitally controlled oscillator (DCO) configured to provide the oscillating signal to the mixer, the DCO having multiple frequency steps that include a first frequency and a second frequency; a transition controller operably coupled with the DCO, the transition controller configured to; deactivate, during successive sub-intervals of a transition time, the first frequency of the DCO for increasing amounts of time to transition the oscillating signal from the first frequency; and activating, during successive sub-intervals of the transition time, the second frequency of the DCO when the first frequency is deactivated to transition the oscillating signal to the second frequency. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification