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US 7,116,144 B1Granted
High bandwidth phase locked loop (PLL)
AssigneeMarvell International Ltd.
InventorChi Fung Cheng
Life of this patent
Estimating the term…
Abstract
A phase locked loop (PLL) is provided. In one implementation, the PLL includes a feedback loop having a frequency multiplier and an integer divider to generate a divided signal. The PLL includes a re-sampling circuit operable to re-sample one or more digital pulses of the divided signal using one or more phase signals if a multiplication factor of the frequency multiplier does not divide evenly into the integer divisor.
Claims55
A phase locked loop, comprising:
- a feedback loop, the feedback loop including,
- an integer divider operable to divide a feedback loop signal in accordance with an integer divisor and produce a divided signal having one or more digital pulses;
- a frequency multiplier operable to multiply the divided signal by a multiplication factor, including inserting one or more additional digital pulses into the divided signal to generate a multiplied signal;
- and
- a re-sampling circuit operable to re-sample one or more of the additional digital pulses inserted into the divided signal if the multiplication factor does not divide evenly into the integer divisor.
2 more elements
A method comprising:
- dividing a feedback loop signal in accordance with an integer divisor and generating a divided signal having one or more digital pulses;
- multiplying the divided signal by a multiplication factor, including inserting one or more additional digital pulses into the divided output signal to generate a multiplied signal;
- and
- re-sampling one or more of the additional digital pulses inserted into the divided signal if the multiplication factor does not divide evenly into the integer divisor.
1 more element
A disk drive system, comprising:
- a read/write head configured to sense changes in magnetic flux on a surface of a disk according to a control signal supplied by a phase locked loop (PLL) and generate a corresponding analog signal, the PLL including,
- an integer divider operable to divide a feedback loop signal in accordance with an integer divisor and produce a divided signal having one or more digital pulses;
- a frequency multiplier operable to multiply the divided signal by a multiplication factor, including inserting one or more additional digital pulses into the divided signal to generate a multiplied signal;
- and
- a re-sampling circuit operable to re-sample one or more of the additional digital pulses inserted into the divided signal if the multiplication factor does not divide evenly into the integer divisor;
- the disk drive system further comprising a preamplifier configured to amplify the analog signal;
- and
- a read channel configured to receive the amplified analog signal and generate a digital read signal based on the amplified analog signal.
5 more elements
A phase locked loop, comprising:
- feedback means including,
- means for dividing a feedback loop signal in accordance with an integer divisor and producing a divided signal having one or more digital pulses;
- means for multiplying the divided signal by a multiplication factor, including inserting one or more additional digital pulses into the divided signal and generating a multiplied signal;
- and
- means for re-sampling one or more of the additional digital pulses inserted into the divided signal if the multiplication factor does not divide evenly into the integer divisor.
2 more elements
A disk drive system, comprising:
- sensing means for sensing changes in magnetic flux on a surface of a disk according to a control signal supplied by a phase locking means and generating a corresponding analog signal, the phase locking means including,
- dividing means for dividing a feedback loop signal in accordance with an integer divisor and producing a divided signal having one or more digital pulses;
- multiplying means for multiplying the divided signal by a multiplication factor,
- including inserting one or more additional digital pulses into the divided signal and generating a multiplied signal;
- and
- re-sampling means for re-sampling one or more of the additional digital pulses inserted into the divided signal if the multiplication factor does not divide evenly into the integer divisor;
- the disk drive system further comprising means for amplifying the analog signal;
- and
- means for receiving the amplified analog signal and generating a digital read signal based on the amplified analog signal.
6 more elements
Dependencies are inferred from the claim text.