Rapid sampling phase recovery
AssigneeLSI Corporation
InventorsAlbert Molina, Oisin Ó Cuanacháin, Ramon Sanchez
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Abstract
In a communication receiver, timing recovery circuitry includes a loop filter associated with a timing recovery loop of a first communication device. The first communication device is in communication with a second communication device prior to a temporary power down/power up sequence in the first communication device. The loop filter is configured to: (i) temporarily disable at least a portion of the timing recovery loop after the temporary power down/power up sequence in the first communication device; and (ii) initiate a progression through a set of potential sampling phases to determine a given sampling phase at which the first communication device can recommence communication with the second communication device.
Claims20
An apparatus comprising:
- timing recovery circuitry comprising a loop filter associated with a timing recovery loop of a first communication device, the first communication device being in communication with a second communication device prior to a temporary power down/power up sequence in the first communication device;
- wherein the loop filter is configured to:
- (i) temporarily disable at least a portion of the timing recovery loop after the temporary power down/power up sequence in the first communication device;
- and (ii) while the portion of the timing recovery loop is temporarily disabled, introduce a signal in a frequency recovery portion of the timing recovery loop operative to initiate a progression through a set of potential sampling phases to determine a given sampling phase at which the first communication device can recommence communication with the second communication device.
A method comprising:
- temporarily disabling at least a portion of a timing recovery loop after a temporary power down/power up sequence in a first communication device, the first communication device being in communication with a second communication device prior to the temporary power down/power up sequence in the first communication device;
- and
- while the portion of the timing recovery loop is temporarily disabled, introducing a signal in a frequency recovery portion of the timing recovery loop operative to initiate a progression through a set of potential sampling phases to determine a given sampling phase at which the first communication device can recommence communication with the second communication device.
A method of recovering an optimal sampling phase in a receiver after a power down/power up sequence, comprising:
- disabling a sampling phase recovery portion of a timing recovery loop of the receiver;
- introducing a frequency offset in a frequency recovery portion of the timing recovery loop such that the timing recovery loop progresses through a set of potential sampling phases;
- as progression through the set of potential sampling phases proceeds, using a metric to determine how close the timing recovery loop is to the optimal sampling phase;
- and
- when it is determined that the timing recovery loop is suitably close to the optimal sampling phase, removing the frequency offset and re-enabling the phase recovery portion of the timing recovery loop.
Dependencies are inferred from the claim text.