PLL WITH ACROSS-STAGE CONTROLLED DCO
First Claim
1. A phase lock loop (PLL), comprising:
- an across-stage digital controlled oscillator (DCO) controller comprising;
a first detector configured to receive a first tuning code in a current stage in which an output frequency of a DCO is tuned by a first step size and generate a first detect signal which indicates whether the first tuning code exceeds a first range that the DCO can be correspondingly tuned in the current stage; and
a second tuning code adjustor configured to adjust a second tuning code from a previous stage from which the output frequency of the DCO is tuned by a second step size in response to the first detect signal, the second step size being larger than the first step size; and
the DCO configured to generate the output frequency in response to codes comprising the adjusted second tuning code from the across-stage DCO controller.
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Accused Products
Abstract
In some embodiments, a PLL comprises an across-stage DCO controller and a DCO. The across-stage DCO controller comprises a first detector and a second tuning code adjustor. The first detector receives a first tuning code in a current stage in which an output frequency of the DCO is tuned by a first step size and generates a first detect signal which indicates whether the first tuning code exceeds a first range that the DCO can be correspondingly tuned in the current stage. The second tuning code adjustor adjusts a second tuning code from a previous stage in which the output frequency of the DCO is tuned by a second step size in response to the first detect signal. The second step size is larger than the first step size. The DCO generates the output frequency in response to codes comprising the adjusted second tuning code.
7 Citations
20 Claims
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1. A phase lock loop (PLL), comprising:
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an across-stage digital controlled oscillator (DCO) controller comprising; a first detector configured to receive a first tuning code in a current stage in which an output frequency of a DCO is tuned by a first step size and generate a first detect signal which indicates whether the first tuning code exceeds a first range that the DCO can be correspondingly tuned in the current stage; and a second tuning code adjustor configured to adjust a second tuning code from a previous stage from which the output frequency of the DCO is tuned by a second step size in response to the first detect signal, the second step size being larger than the first step size; and the DCO configured to generate the output frequency in response to codes comprising the adjusted second tuning code from the across-stage DCO controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A phase lock loop (PLL) comprising:
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a first detector configured to receive a first tuning code which controls an output frequency of a DCO to be tuned by a first step size and generate a first detect signal which indicates whether the first tuning code exceeds a first range that the first tuning code is allowed to tune the output frequency; a second tuning code adjustor configured to adjust the second tuning code which controls the output frequency of the DCO to be tuned by a second step size, the second tuning code being adjusted in response to the first detect signal, and the second step size being larger than the first step size; and the DCO configured to generate the output frequency in response to codes comprising the adjusted second tuning code. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method, comprising:
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receiving, by at least one processor, a first tuning code in a current stage in which an output frequency is tuned by a first step size; detecting, by the at least one processor, whether the first tuning code exceeds a first range that the output frequency can be correspondingly tuned in the current stage; adjusting a second tuning code, by the at least one processor, from a previous stage in which the output frequency is tuned by a second step size if the first tuning code exceeds a first range that the output frequency can be correspondingly tuned in the current stage, the second step size being larger than the first step size. generating the output frequency in response to codes comprising the adjusted second tuning code.
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Specification