Data-dependent jitter pre-emphasis for high-speed serial link transmitters
AssigneeIBM Corporation
InventorsJames Buckwalter, Daniel Friedman, Mounir Meghelli
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Abstract
In the context of high-speed serial links, data-dependent jitter compensation techniques performed using phase pre-distortion. Broadly contemplated is an expansion of the notion of pre-emphasis beyond conventional amplitude compensation of ISI, whereby phase pre-emphasis for compensating data-dependent jitter (DDJ) is introduced. DDJ can be addressed by exploiting the relationship between the data sequence and the timing deviation. Phase pre-emphasis improves the signal integrity with little additional power consumption in the transmitter and with no cross-talk penalty.
Claims20
An apparatus for providing data dependent jitter in data transmission, said apparatus comprising:
- an input arrangement for accepting data input;
- an arrangement for detecting and decoding transitions in the data input;
- said arrangement for detecting and decoding being adapted to ascertain data transition history in the data input;
- and
- an arrangement for applying at least one delay to at least a portion of the data input, based on the ascertained data transition history.
A method of providing data dependent jitter in data transmission, said method comprising the steps of:
- accepting data input;
- detecting and decoding transitions in the data input;
- said step of detecting and decoding comprising ascertaining data transition history in the data input;
- and
- applying at least one delay to at least a portion of the data input, based on the ascertained data transition history.
Dependencies are inferred from the claim text.