Rapid positioning method and device for high-frequency signal crosstalk problem

Abstract

The invention provides a rapid positioning method and device for a high-frequency signal crosstalk problem, and the device comprises a generation module and a detection module, the generation module is integrated at a chip transmitting end TX and is used for generating a differential or common-mode step signal, and the detection module is integrated at the chip transmitting end TX or a receiving end RX and is used for detecting the differential or common-mode signal. Signal sampling can be carried out according to equal time intervals, and the generation module and the detection module carry out time synchronization through a time synchronization channel in a chip. According to the method, the magnitude and the position of the crosstalk can be analyzed by outputting the step signal at the transmitting end TX of the invading network and measuring the amplitude and the time of the signal generated by the crosstalk at the receiving end RX or the transmitting end TX specified by the victim network.

Description

Technical Field

[0001] The invention belongs to the technical field of high-speed signal crosstalk, and in particular relates to a method and device for quickly locating a high-frequency signal crosstalk problem. Background Art

[0002] Crosstalk is the mutual influence between two groups of signals that are close to each other. The crosstalk path is the mutual inductance and mutual capacitance formed between the two groups of signals. The crosstalk between high-speed signals is as follows: Figure 1 As shown, they affect each other in the form of current and voltage respectively. The network that affects other circuits is called the aggressor network, and the network that is affected is called the victim network. Usually in the signal transmission path, the impact of crosstalk is harmful and belongs to noise, which should be avoided as much as possible.

[0003] When locating link bit error problems, it is necessary to distinguish whether it is caused by crosstalk. It is impossible to measure it by instrumentation on a fully assembled system. An online test method and device for crosstalk is needed. At present, in order to measure the crosstalk of the system, it is necessary to design a fixture board to lead out the chip position in the form of an RF coaxial connector, such as SMA (SubMiniature version A), that is, replace the chip board with a fixture board with an RF coaxial connector interface, and the test instrument uses the RF coaxial connector interface to measure crosstalk. Use time domain or frequency domain to measure. This method requires the additional design of a fixture board, but the fixture board is different from the actual single board and cannot reflect the crosstalk of the chip package. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for quickly locating high-frequency signal crosstalk problems, so as to solve the technical problems that the prior art proposed in the above background technology requires additional design of a fixture plate and cannot reflect chip package crosstalk.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method and device for quickly locating high-frequency signal crosstalk problems, comprising a generation module and a detection module, wherein the generation module is integrated in a chip transmitting end TX and is used to generate a differential or common-mode step signal, and the detection module is integrated in a chip transmitting end TX or a receiving end RX and is used to detect a differential or common-mode signal, and can perform signal sampling at equal time intervals. The generation module and the detection module are time synchronized through a time synchronization channel within the chip.

[0007] Another object of the present invention is to provide a method for quickly locating a high-frequency signal crosstalk problem. The method comprises the following steps:

[0008] First, a differential or common mode step signal is sent at the transmitting end TX of the offending network;

[0009] Next, on the same side of the victim network, sampling is performed at equal time intervals to obtain V xtalk and T delta , store or output the sampled data;

[0010] Analysis V xtalk Obtain the amplitude of the victim waveform, thereby obtaining the amplitude of the crosstalk, and analyzing T delta Get the time difference between the damaged waveform and the offending waveform, 1 / 2T delta is the distance between the crosstalk location and the interference source, where

[0011] V xtalk : Indicates the amplitude of the victim waveform detected on the victim network, reflecting the amplitude of the crosstalk;

[0012] T delta : It indicates the time difference between the victim waveform detected on the victim network and the offending waveform, reflecting the location of the crosstalk.

[0013] Furthermore, for far-end crosstalk, sampling is performed at equal time intervals on the other side of the victim network, i.e., the receiving end RX, to obtain V xtalk , store or output the sampled data, analyze V xtalk The amplitude of the victim waveform is obtained, and thus the amplitude of the crosstalk is obtained.

[0014] Furthermore, during online testing, a unit pulse signal, a PRBS pattern or a service pattern may be sent.

[0015] The present invention has the following beneficial effects:

[0016] 1. Ability to perform crosstalk measurement online, avoiding the need to make additional test boards;

[0017] 2. Able to realize online detection and problem location of finished boards;

[0018] 3. Ability to determine crosstalk location and size.

[0019] The present invention outputs a step signal at the transmitting end (TX) of the offending network, and adjusts the amplitude (V) of the signal generated by the crosstalk at the receiving end (RX) or the transmitting end (TX) specified by the victim network. xtalk ) and time (T delta ) can be used to analyze the size and location of crosstalk. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of high-speed signal crosstalk;

[0022] Figure 2 It is a schematic diagram of the structure inside the chip of the present invention;

[0023] Figure 3 This is a schematic diagram of far-end crosstalk;

[0024] Figure 4 This is a schematic diagram of near-end crosstalk. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figures 2 to 4 As shown, a rapid positioning device for high-frequency signal crosstalk problems includes a generation module and a detection module. The generation module is integrated in the chip transmitting end (TX) and is used to generate a differential or common mode step signal. The detection module is integrated in the chip transmitting end (TX) or receiving end (RX) and is used to detect differential or common mode signals, and can perform signal sampling at equal time intervals. The generation module and the detection module are time synchronized through the time synchronization channel in the chip, so that when the generation module starts to send a signal, the action of the detection module is triggered.

[0027] Based on the above-mentioned rapid location device for high-frequency signal crosstalk problems, the present invention proposes a rapid location method for high-frequency signal crosstalk problems, which analyzes the manifestation of crosstalk in the time domain waveform. If a step signal intrusion waveform is sent from the infringing network, a voltage / current disturbance will be generated on the victim network. From the perspective of voltage alone, there will be the following two values:

[0028] V xtalk : Indicates the amplitude of the victim waveform detected on the victim network, reflecting the amplitude of the crosstalk.

[0029] T delta : It indicates the time difference between the victim waveform detected on the victim network and the offending waveform, reflecting the location of the crosstalk.

[0030] Figure 3 and Figure 4 Schematic diagrams of far-end crosstalk and near-end crosstalk are given respectively.

[0031] The crosstalk detection process for the same chip is as follows:

[0032] First, a differential or common-mode step signal is sent at the transmit end (TX) of the offending network.

[0033] Next, on the same side of the victim network: Figure 3 The sender (TX) of the victim network or Figure 4 The receiving end (RX) of the victim network performs sampling at equal time intervals and stores or outputs the sampled data.

[0034] Analysis V xtalk Obtain the amplitude of the victim waveform, and thus the amplitude of the crosstalk. delta Get the time difference between the damaged waveform and the offending waveform, 1 / 2T delta Indicates the distance between the crosstalk location and the interference source.

[0035] Using continuous sampling data, the distribution of crosstalk in the entire link can be analyzed.

[0036] The detection process of far-end crosstalk for different chips is as follows:

[0037] First, a differential or common-mode step signal is sent at the transmit end (TX) of the offending network.

[0038] Next, sampling is performed at equal time intervals on the other side of the victim network, namely the receiving end (RX), and the sampled data is stored or output.

[0039] Analysis V xtalk The amplitude of the victim waveform is obtained, and thus the amplitude of the crosstalk is obtained.

[0040] This scenario cannot be time synchronized, so the exact location cannot be obtained, but the interference amplitude can be accurately obtained.

[0041] The present invention sends a differential or common-mode step signal through an infringing network, performs noise amplitude sampling at equal time intervals at both ends of the victim network, and uses amplitude and time to analyze the crosstalk position and size.

[0042] In the case of online testing, only the chip itself can send waveforms, and different code types can be sent, such as unit pulse signals, PRBS code types, or business code types.

[0043] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A rapid location device for high-frequency signal crosstalk problems, characterized in that: It includes a generation module and a detection module. The generation module is integrated in the chip transmitting end TX and is used to generate a differential or common mode step signal. The detection module is integrated in the chip transmitting end TX or the receiving end RX and is used to detect the differential or common mode signal. The signal can be sampled at equal time intervals. The generation module and the detection module are synchronized through the time synchronization channel in the chip.

2. A method for quickly locating a high-frequency signal crosstalk problem, based on the device for quickly locating a high-frequency signal crosstalk problem according to claim 1, characterized in that: The following steps are included: First, a differential or common mode step signal is sent at the transmitting end TX of the offending network; Next, on the same side of the victim network, sampling is performed at equal time intervals to obtain V xtalk and T delta , store or output the sampled data; Analysis V xtalk Obtain the amplitude of the victim waveform, thereby obtaining the amplitude of the crosstalk, and analyzing T delta Get the time difference between the damaged waveform and the offending waveform, 1 / 2T delta is the distance between the crosstalk location and the interference source, where V xtalk : Indicates the amplitude of the victim waveform detected on the victim network, reflecting the amplitude of the crosstalk; T delta : It indicates the time difference between the victim waveform detected on the victim network and the offending waveform, reflecting the location of the crosstalk.

3. The method for quickly locating a high-frequency signal crosstalk problem according to claim 2, characterized in that: For far-end crosstalk, sampling is performed at equal time intervals on the opposite side of the victim network, i.e., the receiving end RX, to obtain V xtalk , store or output the sampled data, analyze V xtalk The amplitude of the victim waveform is obtained, and thus the amplitude of the crosstalk is obtained.

4. A method for quickly locating a high-frequency signal crosstalk problem according to claim 2 or 3, characterized in that: During online testing, you can send unit pulse signals, PRBS patterns, or business patterns.

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