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On-demand feed forward equalizer with distributed arithmetic architecture and method

A feedforward equalization, distributed technology, applied in the field of feedforward equalization

Pending Publication Date: 2020-08-11
MARVELL ASIA PTE LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, PAM-4 signals are particularly susceptible to noise degradation during transmission

Method used

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  • On-demand feed forward equalizer with distributed arithmetic architecture and method
  • On-demand feed forward equalizer with distributed arithmetic architecture and method
  • On-demand feed forward equalizer with distributed arithmetic architecture and method

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Embodiment Construction

[0029] As mentioned above, 4-level pulse amplitude modulated (PAM-4) signals are particularly susceptible to noise degradation during transmission. Therefore, within a PAM-4 receiver (RX), a received PAM-4 signal will first be processed by an analog front end (AFE), which may include, but is not limited to, an amplifier and a continuous time linear equalizer (CTLE). Additionally, the output of the AFE will be digitized by analog-to-digital conversion and then equalized using a feed-forward equalizer (FFE) that corrects signal loss by reducing smearing (eg Figure 2C ), then reopen the Eye Diagram (as shown in Figure 1D shown). Specifically, to correct for loss of signal for the current data sample, which should represent a particular transmitted two-bit symbol, and is captured from the main wiper tap on the transmission medium, the FFE looks at data samples captured at other taps, especially Data samples captured before and after the current data sample (i.e., looking at da...

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Abstract

The invention relates to an On-demand feed forward equalizer with distributed arithmetic architecture and a method. Disclosed is a power-optimized distributed arithmetic (DA)-based feed forward equalizer (FFE) that performs on-demand equalization processing of a data sample. Specifically, a data stream is represented by digital words, which indicate signal levels at taps on a transmission medium.A screener applies formulas to selected taps as opposed to all taps (e.g., to the main cursor tap, which corresponds to the current data sample, and to specific pre-cursor and post-cursor taps, whichcorrespond to immediately proceeding and following data samples) to determine whether the current data sample (which should indicate a specific two-bit symbol) has degraded during transmission to a point where equalization processing is required. If so, a bypass flag is set to a first level so that the data sample is subjected to equalization processing. If not, the bypass flag is set to a secondlevel so that such processing is bypassed. Also disclosed is a corresponding method.

Description

technical field [0001] The present invention relates to feedforward equalizers (FFEs) for data link receivers, and more particularly to an FFE configuration optimized for reduced power consumption and a corresponding feedforward equalization method. Background technique [0002] Feedforward equalizers (FFE) are often incorporated into data link receivers (RX) such as 4-level pulse amplitude modulation (PAM-4) data receivers to correct for signal degradation. In particular, those skilled in the art will recognize that a PAM-4 signal includes four different levels of pulse modulation (ie, four pulse amplitudes at different voltage levels) and is used to convey information. Each of the four different amplitude levels corresponds to a different two-digit symbol (ie, 00, 01, 10, and 11). The data link transmitter (TX) transmits two bits of symbols in a given bit period (T) (here also referred to as the symbol period), which actually means that two data bits are transmitted in pa...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/02
CPCH04L25/03885H04L25/0202H04L27/06H04L27/01H04L25/03038H04L27/38H04L25/03076
Inventor K·S·伦加拉詹V·A·鲁帕雷里亚P·S·S·雷迪
Owner MARVELL ASIA PTE LTD
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