Data-dependent jitter pre-emphasis for high-speed serial link transmitters

a serial link and data-dependent technology, applied in the field of data equalization techniques for high-speed serial links, can solve the problems of increasing power consumption and chip area, placing additional demands on the dynamic range of the transmitter, etc., and achieves no cross-talk penalty, little additional power consumption, and improved signal integrity.

Inactive Publication Date: 2007-08-02
GLOBALFOUNDRIES INC
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Benefits of technology

[0006] In accordance with at least one presently preferred embodiment of the invention, there is broadly contemplated an expansion of the notion of pre-emphasis beyond conventional amplitude compensation of ISI, whereby phase pre-emphasis for compensating data-dependent

Problems solved by technology

Currently, one challenge of equalization is minimizing power consumption while still improving signal integrity in the presence of attenuation and reflections.
The use of amplitud

Method used

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  • Data-dependent jitter pre-emphasis for high-speed serial link transmitters
  • Data-dependent jitter pre-emphasis for high-speed serial link transmitters
  • Data-dependent jitter pre-emphasis for high-speed serial link transmitters

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Embodiment Construction

[0013] Generally speaking, in a link where losses due to signal attenuation are dominating other channel impairments such as reflection due to discontinuities, the amount of DDJ of a random bit sequence at the end of a link, which corresponds to timing deviation from ideal transition time, depends on the previous bit sequences only. Thus, the amount of DDJ at a given transition time corresponding to a given channel can be predicted by simply keeping track of the previous transitions. Also, it can be shown that the most recent transitions in previous data bits contribute to DDJ with larger amount. Thus, most of the DDJ can be predicted and compensated for by only detecting some of the most recent transitions. For typical links, one needs to detect down to the three previous data transitions to predict most of the DDJ occurring at a the current data transition.

[0014] Phase pre-emphasis manipulates the data transitions to neutralize DDJ at the end of the transmission channel. The dela...

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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.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to data equalization techniques for high speed serial links. BACKGROUND OF THE INVENTION [0002] High bandwidth chip-to-chip interconnection is a crucial part of many systems today. High speed inputs / outputs (I / Os) are extensively used in server processors, memory-central processing unit (CPU) interfaces, multiprocessor systems, and gaming applications. With increasing speed of on-chip data processing, there is an increasing demand for higher data rates. These high speed I / Os must also be capable of supporting low cost package and board technologies which introduce large signal degradation through bandwidth loss, reflection, and crosstalk. [0003] Equalization of high-speed serial links has evolved to compensate inter-symbol interference (ISI) caused by frequency-dependent attenuation found in interconnects. Pre-emphasis-based equalization in the transmitter and decision feedback equalization in the receiver figure ...

Claims

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Application Information

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IPC IPC(8): H03H7/30
CPCH03K5/135H03M9/00H04J3/047H04L7/0037H04L25/03343H04L25/03885H04J3/0685
Inventor BUCKWALTER, JAMES F.FRIEDMAN, DANIEL J.MEGHELLI, MOUNIR
Owner GLOBALFOUNDRIES INC
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