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Jitter data injection method and circuit, and eye pattern monitor

A monitor and circuit technology, applied in the field of communication systems, can solve problems such as low efficiency and complicated injection process, and achieve the effects of simplifying the injection process, reducing the test cycle, and improving test efficiency

Active Publication Date: 2019-02-26
ANALOGIX CHINA SEMICON +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a method and circuit for injecting jitter data, and an eye diagram monitor, so as to at least solve the technical problem of injecting jitter data from off-chip to the clock data recovery circuit in the prior art, and the injection process is complicated and inefficient.

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  • Jitter data injection method and circuit, and eye pattern monitor
  • Jitter data injection method and circuit, and eye pattern monitor
  • Jitter data injection method and circuit, and eye pattern monitor

Examples

Experimental program
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Embodiment 1

[0039] According to an embodiment of the present invention, an embodiment of a method for injecting jitter data is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and , although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0040] figure 2 is a flow chart of a dithering data injection method according to an embodiment of the present invention, such as figure 2 As shown, the method includes the following steps:

[0041] Step S202, injecting jitter data into the clock data recovery circuit through the eye monitor.

[0042] Step S204, judging whether there is an error in the recovered data output by the clock data recovery circuit.

[0043] Step S206, if there is an error in the restored data, stop injecting jitter data thr...

Embodiment 2

[0067] According to an embodiment of the present invention, an embodiment of a dithering data injection circuit is provided.

[0068] Figure 5 is a schematic diagram of a jitter data injection circuit according to an embodiment of the present invention, such as Figure 5 As shown, the circuit includes:

[0069] An eye monitor 51 for outputting jitter data.

[0070] The clock data recovery circuit 53 is connected with the eye monitor, and is used to receive the jitter data and generate recovery data.

[0071] Specifically, the above-mentioned valid data may be data recovered by CTLE and DFE in the receiver.

[0072] The eye monitor is also used to stop outputting jitter data if the recovered data is erroneous.

[0073] In an optional solution, the jitter can be continuously injected into the CDR through the eye monitor until the CDR cannot track the jitter and the output recovery data has an error. At this time, the size of the jitter injected by the eye monitor can be use...

Embodiment 3

[0091] According to an embodiment of the present invention, an embodiment of an eye pattern monitor is provided.

[0092] Figure 7 is a schematic diagram of an eye monitor according to an embodiment of the present invention, such as Figure 7 As shown, the eye monitor consists of:

[0093] A counter 71 , a clock signal is input to the first input end of the counter, and is used for generating a count value according to the clock signal.

[0094] Sign bit data generation circuit 73, the first input end of sign bit data generation circuit is connected with the output end of counter, the second input end of sign bit data generation circuit inputs preset value, the first control terminal of sign bit data generation circuit, The second control terminal and the third control terminal input the first control signal, the second control signal and the third control signal respectively, and are used to input the first control signal, the second control signal and the third control si...

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Abstract

The invention discloses an injection method and circuit of jitter data and an eye pattern monitor. The method comprises the steps of: by the eye pattern monitor, injecting the jitter data into a clock and data recovery circuit; judging whether recovery data output by the clock and data recovery circuit has a fault; and if the recovery data has the fault, stopping injecting the jitter data by the eye pattern monitor. The injection method and circuit of the jitter data and the eye pattern monitor, which are disclosed by the invention, solve the technical problems of complex injection process and low efficiency in the prior art in which the jitter data is injected into the clock and data recovery circuit in an off-chip mode, and can implement on-chip automatic injection of the jitter data, so that the aim of measuring a margin of the clock and data recovery circuit is fulfilled, and effects of simplifying the injection process and promoting injection efficiency can be achieved, thereby achieving effects of reducing a testing period of a jitter space and improving testing efficiency of the jitter space.

Description

technical field [0001] The invention relates to the field of communication systems, in particular to a jitter data injection method and circuit, and an eye pattern monitor. Background technique [0002] In a communication system, a clock data recovery circuit (Clock Data Recovery, CDR for short) is an important circuit of a receiver. Its role is to restore effective signals from noise-containing signals, and find the best clock phase sampling data to make the data recovery most stable. [0003] figure 1 A schematic diagram of a receiver according to the prior art, such as figure 1 As shown, the data received by the receiver will be attenuated to a certain extent, and it will be firstly processed by the continuous time linear equalizer (abbreviated as CTLE) and decision feedback equalizer (abbreviated as DFE). The first step of recovery, and then the second step of data recovery through CDR. Usually, you can draw the jitter tolerance curve to get the margin of the CDR. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16
CPCH04B1/16
Inventor 王立果
Owner ANALOGIX CHINA SEMICON