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Decision Feedback Equalizer with Programmable Taps

A decision feedback equalization and tap technology, which is applied to the shaping network, baseband system, digital transmission system, etc. in the transmitter/receiver, and can solve the problem of the difficulty of equalizing the frequency response of DFE.

Active Publication Date: 2016-05-04
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some received signals are disturbed by prolonged reflections of previously received signals, making it difficult for DFE to equalize the frequency response

Method used

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  • Decision Feedback Equalizer with Programmable Taps
  • Decision Feedback Equalizer with Programmable Taps
  • Decision Feedback Equalizer with Programmable Taps

Examples

Experimental program
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Embodiment Construction

[0031] The making and using of various embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely specific ways to make and use, and do not limit the scope of the invention.

[0032] Figure 1A is a schematic diagram of an exemplary decision feedback equalizer (DFE) 100 with programmable taps according to some embodiments. A DFE input signal Xr is received at DFE 100 when signal data_tx is transmitted over channel 102 . DFE 100 includes an adder 104 that receives a DFE input signal Xr. A limiter 106 connected to the adder 104 converts the adder output Ya into a digital signal Yd. The limiter 106 acts as a buffer, outputting Yd as a digital value based on its input Ya. In some embodiments, Yd=1 if Ya>0, Yd=−1 if Ya<0, and Yd=0 if Ya=0.

[0033] Delay elements (eg, flip-flops) 108...

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Abstract

An apparatus comprises a plurality of delay elements connected in series. Each delay element is configured to delay a respective input signal and to output a respective delayed signal. The apparatus also comprises a weight generator configured to generate a plurality of tap weights based on the delayed signals. The apparatus further comprises a tap controller configured to (1) generate tap weight enabling signals corresponding to one or more of the tap weights based on a determination that the corresponding tap weights are greater than a predetermined threshold value, and (2) generate a set of bias factors. The apparatus additionally comprises a summer configured to output a weighted signal based on the delayed signals, the tap weight enabling signals, the tap weights, and the bias factors.

Description

technical field [0001] The present invention relates generally to integrated circuits and, more particularly, to decision feedback equalizers (DFEs). Background technique [0002] DFE is used to try to equalize the frequency response of the received signal through the channel and increase eye opening without amplifying noise. Some received signals are disturbed by prolonged reflections of previously received signals, making it difficult for the DFE to equalize the frequency response. Contents of the invention [0003] In order to solve the defects in the prior art, according to an aspect of the present invention, a decision feedback equalizer (DFE) with programmable taps is provided, including: an adder configured to receive a DFE input signal; a plurality of a delay element connected to the adder, wherein the plurality of delay elements are connected in series and each delay element provides a corresponding delayed signal of the input signal of the delay element; and a w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
CPCH04L25/03057H04L2025/0349H04L2025/03566H04L2025/03617H04L2025/03687
Inventor 黃明杰陈晶晶陈建宏钟道文林志昌隋彧文
Owner TAIWAN SEMICON MFG CO LTD