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Built-in eye scan for ADC-based receivers

A technology for receivers and scanning circuits, applied in transmitter/receiver shaping networks, instruments, measuring devices, etc., can solve the problems of limited and expensive non-destructive eye scanning

Active Publication Date: 2021-06-29
XILINX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such time-interleaved systems, non-destructive eye scanning becomes very expensive due to the number of additional ADCs required for the eye scanning function
Destructive eye scanning based on ADC SerDes has minimal implementation cost, but it is usually limited to synchronous systems

Method used

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  • Built-in eye scan for ADC-based receivers
  • Built-in eye scan for ADC-based receivers
  • Built-in eye scan for ADC-based receivers

Examples

Experimental program
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Embodiment Construction

[0034] Various features are described below with reference to the accompanying drawings. It should be noted that the drawings may or may not be drawn to scale, and that elements of similar structure or function are denoted by the same reference numerals throughout the drawings. It should be noted that the drawings are only intended to facilitate the description of the features. They are not intended as an exhaustive description of the claimed invention, or as a limitation on the scope of the claimed invention. In addition, the illustrated examples need not have all of the aspects or advantages shown. An aspect or advantage described in connection with a particular example is not necessarily limited to that example and can be practiced in any other example even if not so shown or explicitly described.

[0035] figure 1 is a block diagram depicting an example of a serial communication system 100 . Serial communication system 100 includes transmitter 112 coupled to receiver 1...

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PUM

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Abstract

An example method of performing an eye scan in a receiver includes generating (104) digital samples from an analog signal input to the receiver based on a sampling clock that is phased relative to a reference clock based on a phase interpolator (PI) code. equalize (204) the digital samples based on a first equalization parameter of a plurality of equalization parameters of the receiver; adapt (404) the plurality of equalization parameters and perform clock recovery based on the digital samples to generate a PI code; and perform a plurality of cycles The following operations: lock (406) multiple equalization parameters, suspend (408) phase detection in clock recovery, shift (410) PI code, collect (412) the output of the receiver, recover (414) phase in clock recovery Detect, and unlock (414) equalization parameters to perform an eye scan.

Description

technical field [0001] Examples of the present disclosure relate generally to electronic circuits, and in particular to built-in eye scanning for analog-to-digital converter (ADC) based receivers. Background technique [0002] In a serializer-de-serializer (SerDes) system, it is desirable to be able to check the quality of the received and recovered signal. This is useful for system margining and debugging purposes. Receiver eye scanning is an important technique for this purpose. For analog-based SerDes systems, there are generally two methods of obtaining an eye scan. The first technique is often referred to as "destructive eye scanning." In destructive eye-scan mode, change the clipping threshold and sampling phase of the actual data slicer to perform an eye-scan. This eye scan technique cannot be used to receive actual data traffic since the clipped data during a destructive eye scan may be incorrect. However, the destructive eye scanning technique requires no addit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00H04L25/03H04L7/00
CPCH04L7/0025H04L7/0087G01R31/44H04L25/03885
Inventor 张洪涛Z·D·吴C·J·博雷利G·张
Owner XILINX INC