Linear equalizer compensation gain calibration system and calibration method

Abstract

The present invention provides a linear equalizer compensation gain calibration system and calibration method, wherein the linear equalizer compensation gain calibration system includes a test signal generation module, a signal attenuation module, a linear equalizer and a test signal receiving module; the test signal generation module is used to generate a test signal with a preset transmission rate; the signal attenuation module attenuates the test signal with a preset attenuation value to obtain an attenuated signal; the linear equalizer receives the attenuated signal, and compensates the attenuated signal with a preset attenuation value corresponding to the gear to be tested to obtain a compensation signal; the test signal receiving module receives the compensation signal, and adjusts the actual gain value corresponding to the gear to be tested of the linear equalizer based on the difference between the compensation signal and the test signal. The present invention simulates the attenuation in a high-speed transmission environment by setting an attenuation channel, and uses standardized attenuation as a measurement standard to calibrate the gains of each gear of the linear equalizer.

Description

Technical Field

[0001] The present invention relates to the field of signal transmission, and in particular to a linear equalizer compensation gain calibration system and calibration method. Background Art

[0002] In the field of modern high-speed optical communications, electrical signals are susceptible to inter-symbol interference (ISI) during transmission, which affects the stability and reliability of data transmission.

[0003] In order to reduce signal distortion and noise interference during transmission, a continuous time linear equalizer (CTLE) is usually used to equalize the signal, by increasing the gain of the high-frequency part to offset the signal attenuation caused by frequency attenuation during transmission. Depending on the degree of signal attenuation, the CTLE will select different gears for gain compensation, and may even use multiple gears to compensate the signal at the same time; therefore, the gain of each gear of the CTLE needs to ensure a certain degree of accuracy, at least the consistency of the gain of each gear needs to be ensured.

[0004] Based on this, the prior art provides a method for directly measuring and calibrating the gain of each gear of the CTLE, which tests the gain characteristics of each gear by testing the two ends of the chip loaded on the CTLE with a vector network analyzer, and then adjusts the gain of each gear to make it more accurate. However, other driving circuits are also set inside the CTLE chip, and the direct measurement method is not accurate for measuring the CTLE gain, which ultimately affects the accuracy of the calibration of the gain of each gear.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a linear equalizer compensation gain calibration system and calibration method, so as to solve the problem of insufficient accuracy of the gain calibration of each gear in the prior art.

[0007] To achieve the above objectives and other related objectives, the present invention provides a linear equalizer compensation gain calibration system, comprising:

[0008] A test signal generating module, a signal attenuation module, a linear equalizer and a test signal receiving module;

[0009] The test signal generating module is used to generate a test signal with a preset transmission rate;

[0010] The signal attenuation module receives the test signal, and attenuates the test signal with a preset attenuation value to generate an attenuated signal, wherein the preset attenuation value is set corresponding to a preset gain value of the gear to be tested of the linear equalizer;

[0011] The linear equalizer receives the attenuated signal and adjusts the linear equalizer to different gears for gain compensation to generate different compensation signals;

[0012] The test signal receiving module receives each of the compensation signals, and adjusts the actual gain value of the linear equalizer corresponding to the gear position to be tested based on the difference between each of the compensation signals and the test signal.

[0013] Optionally, the linear equalizer compensation gain calibration system further includes a capacitance isolation module; the capacitance isolation module is arranged between the signal attenuation module and the linear equalizer.

[0014] Optionally, the test signal is set as a single-ended signal or a differential signal.

[0015] Optionally, when the test signal is set as a single-ended signal, the signal attenuation module includes a signal attenuation board to receive the corresponding single-ended signal; when the test signal is set as a differential signal, the signal attenuation module includes two signal attenuation boards to respectively receive the corresponding differential signals;

[0016] The signal attenuation board is provided with N attenuation channels with preset lengths, and the test signal is attenuated through at least one of the attenuation channels, where N is an integer greater than or equal to 1.

[0017] Optionally, when N is an integer greater than or equal to 2, the preset lengths of the attenuation channels are different.

[0018] Optionally, the test signal is attenuated via a plurality of the attenuation channels connected in series.

[0019] Optionally, the signal attenuation board is configured as a printed circuit board; and the attenuation channel is configured as a copper conductor on the printed circuit board.

[0020] To achieve the above-mentioned purpose and other related purposes, the present invention provides a linear equalizer compensation gain calibration method, which is implemented based on the above-mentioned linear equalizer compensation gain calibration system, and includes:

[0021] S1, generating a test signal with a preset transmission rate and attenuating the test signal according to a preset attenuation value corresponding to a gear position to be tested of the linear equalizer to generate an attenuated signal;

[0022] S2, adjusting the linear equalizer to different gears for gain compensation to generate different compensation signals;

[0023] S3. Based on the difference between each of the compensation signals and the test signal, adjust the actual gain value of the linear equalizer corresponding to the gear position to be tested.

[0024] Optionally, the gain value corresponding to the time when the difference between each compensation signal and the test signal is the smallest is taken as the actual gain value.

[0025] Optionally, the gain value with the smallest difference between each compensation signal and the test signal is searched in at least one of linear traversal and bidirectional traversal.

[0026] As described above, the linear equalizer compensation gain calibration system and calibration method of the present invention have the following beneficial effects:

[0027] The present invention simulates the attenuation in a high-speed transmission environment by setting an attenuation channel, and uses the standardized attenuation as a measurement standard to calibrate the gains of each gear of the linear equalizer. At the same time, the present invention also compares the compensation values ​​of each gear in a traversal manner to obtain the actual gain value that should be calibrated for the gear to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Shown is a system diagram of a high-speed communication system.

[0029] Figure 2 Display as Figure 1 Eye diagram of the communication signal before transmission.

[0030] Figure 3 Display as Figure 1 Eye diagram of the communication signal after transmission.

[0031] Figure 4 Shown is a system schematic for directly testing a linear equalizer chip.

[0032] Figure 5 Display as Figure 4 Schematic diagram of the internal structure of the linear equalizer chip.

[0033] Figure 6 Shown is a structural schematic diagram of the linear equalizer compensation gain calibration system of the present invention.

[0034] Figure 7 Shown is a schematic structural diagram of the signal attenuation board of the present invention.

[0035] Figure 8 Shown is a step diagram of the linear equalizer compensation gain calibration method of the present invention.

[0036] Fig. 9 It shows the eye diagram of the test signal after passing through the signal attenuation module of the present invention.

[0037] Fig.10 Shown is a line graph of the attenuated signal of the present invention after passing through signal attenuation channels of different lengths.

[0038] Fig.11 Shown as the present invention Fig. 9 Eye diagram of the compensated signal after the attenuated signal passes through the linear equalizer.

[0039] Fig.12 Shown is a line graph of compensation signals obtained by testing different chips according to the present invention.

[0040] Component number description

[0041] 1-high-speed communication system; 11-host chip; 12-communication channel; 13-module connector; 14-capacitor; 15-module clock data recovery chip; 20-linear equalizer chip; 201-initial processing module; 202-continuous time linear equalizer; 203-first multiplexer; 204-linear amplifier; 205-clock data recovery and adaptation module; 206-second multiplexer; 207-modulation laser; 21-vector network analyzer; 3-linear equalizer compensation gain calibration system; 30-linear equalizer; 31-test signal generation module; 32-signal attenuation module; 321-signal attenuation board; 3211-attenuation channel; 33-test signal receiving module; 34-capacitor isolation module. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0043] See also Figure 1 to Figure 12 It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0044] Figure 1 A high-speed communication system 1 is shown, comprising a host chip 11 , a communication channel 12 , a module connector 13 , a capacitor 14 , and a module clock data recovery chip 15 .

[0045] Among them, the communication signal is sent from the host chip 11, and reaches the module clock data recovery chip 15 through the communication channel 12, the module connector 13, and the capacitor 14 in sequence. The module clock data recovery chip 15 recovers the received signal to achieve correct data synchronization.

[0046] In this communication process, the communication signal is affected by the inter-symbol interference during transmission, which will cause the high-frequency signal components to be weakened, resulting in the "open" eye diagram to "close" (such as Figure 2 and Figure 3 As shown in Figure 1.1-1). An “open” eye diagram indicates that the signal has a low noise level, small inter-symbol crosstalk, and good signal quality. Meanwhile, a larger “open” eye diagram indicates that there is a clear distinction between the high and low levels of the signal, which makes data sampling easier and reduces the bit error rate. A “closed” eye diagram means that the signal is subject to greater noise interference or inter-symbol crosstalk, resulting in unclear distinction between the high and low levels of the signal, which makes it difficult for the receiver to accurately sample data.

[0047] In order to solve the problems of signal distortion and noise introduction generated during the transmission process, it is necessary to pre-process the data before the module clock data recovery chip 15. Therefore, a linear equalizer chip 20 is set before the module clock data recovery chip 15 to compensate for the high-frequency signal components. Specifically, different gears are switched according to the degree of loss to perform signal compensation to ensure the accuracy of the final signal acquisition. It can be seen that whether the compensation gain preset in each gear is accurate affects the accuracy of the final signal acquisition.

[0048] Therefore, a design is proposed by directly measuring the compensation gain of the linear equalizer chip 20, such as Figure 4 As shown, by loading a vector network analyzer 21 at both ends of the linear equalizer chip 20, gain curves of different gears of the linear equalizer chip 20 are obtained and the gain curves are used to determine whether the compensation is accurate.

[0049] However, the linear equalizer chip 20 includes not only the continuous time linear equalizer 202, such as Figure 5 As shown, the linear equalizer chip 20 also includes an initial processing module 201, a first multiplexer 203, a linear amplifier 204, a clock data recovery and adaptation module 205, a second multiplexer 206, and a modulated laser 207. Therefore, in the actual measurement process, it is impossible to directly test the frequency response curve and gain curve of the continuous-time linear equalizer 202, and it is also impossible to accurately calibrate it, and it is even impossible to keep the gain deviation of each gear consistent.

[0050] In order to solve the above technical problems, such as Figure 6As shown, this embodiment provides a linear equalizer compensation gain calibration system 3, which at least includes: a test signal generating module 31, a signal attenuation module 32, a linear equalizer 30 and a test signal receiving module 33.

[0051] like Figure 6 As shown, the test signal generating module 31 is used to generate a test signal with a preset transmission rate.

[0052] Specifically, the test signal is set to a pseudo-random binary sequence signal with a certain transmission rate and a certain voltage amplitude. In this embodiment, the linear equalizer 30 is set for a high-speed serial communication link, so the preset transmission rate of the test signal is set to 25.78 Gbps to simulate a high-speed transmission environment, and the voltage amplitude is 500 mV; wherein the voltage amplitude refers to the peak-to-peak voltage value of the signal; at the same time, the test signal is set to a period length of 2 31 The pseudo-random binary sequence (PRBS31) of -1 can be used to test the bit error rate (BER) and signal integrity of the communication link through its randomness and periodicity.

[0053] Specifically, the test signal is set as a single-ended signal or a differential signal; a single-ended signal is a signal transmitted using one signal line relative to a common reference ground (ground plane), and a differential signal is a signal transmitted using two signal lines with equal amplitude and opposite phase. In this embodiment, in order to improve the anti-interference ability and reduce interference to the outside world so as to be suitable for high-speed transmission and long-distance communication, the test signal is set as a differential signal.

[0054] like Figure 6 As shown, the signal attenuation module 32 receives the test signal and attenuates the test signal with a preset attenuation value to generate an attenuated signal, wherein the preset attenuation value is set corresponding to the preset gain value of the gear to be tested of the linear equalizer 30.

[0055] Specifically, when the test signal is set as a single-ended signal, the signal attenuation module 32 includes a signal attenuation board to receive the corresponding single-ended signal; when the test signal is set as a differential signal, the signal attenuation module includes two signal attenuation boards to receive the corresponding differential signals respectively. The test signal is attenuated by the set signal attenuation board. In order to test whether the gain compensation of each gear of the linear equalizer 30 is accurate, it is necessary to pre-set the corresponding attenuation degree of the signal attenuation board; for example, if the gear of the linear equalizer 30 is divided into 9 gears (in actual use, each preset gain is represented by a code value and each gear is matched), and is sorted from small to large according to the pre-set compensation gain value, then the first gear is pre-set to compensate for the gain of 1db, and the ninth gear is pre-set to compensate for the gain of 9db. Then, when the gear to be tested is the third gear (the pre-set compensation gain is 3db), it is necessary to set the signal attenuation board to attenuate by 3db, so as to facilitate the subsequent calibration of the linear equalizer 30.

[0056] As an example, Figure 7 As shown, N attenuation channels 3211 with preset lengths are provided on the signal attenuation plate 321, where N is an integer greater than or equal to 1; the test signal is attenuated through at least one attenuation channel 3211. In this embodiment, in order to test the compensation gain of the gear to be tested, it is necessary to set a corresponding attenuation channel 3211 for attenuation, so at least one attenuation channel 3211 is provided; if it is necessary to test multiple gears, it is necessary to set the gears to be tested respectively and perform attenuation 3211 through the corresponding attenuation channels.

[0057] In this embodiment, when N is an integer greater than or equal to 2, the preset lengths of the attenuation channels 3211 are different. The attenuation degree of the attenuation channel 3211 is positively correlated with the length, and the longer the preset length, the greater the attenuation. Therefore, attenuation channels 3211 with different preset lengths are provided to ensure that the signal attenuation plate 321 can achieve different attenuation values ​​for attenuation.

[0058] In this embodiment, the test signal is attenuated through multiple attenuation channels 3211 connected in series. In actual use, two or more channels can be connected end to end, and the attenuation degree will be superimposed to ensure that the test requirements are met. Therefore, preferably, the number of attenuation channels 3211 and the number of gears to be tested are set to be the same, so as to facilitate direct signal attenuation through a single attenuation channel 3211. Similarly, the number of attenuation channels 3211 and the number of gears to be tested can also be set to be different, and the preset attenuation value calibration test of each gear is met by connecting multiple attenuation channels 3211 in series. The actual attenuation channel setting is not limited to this embodiment.

[0059] In this embodiment, the signal attenuation board 321 is set as a printed circuit board (PCB); the attenuation channel 3211 is set as a copper conductor on the printed circuit board. The preset attenuation value is changed by adjusting the material and geometric shape of the signal attenuation board 321 and the material, layout, and geometric size of the copper conductor. In this embodiment, based on the preset attenuation value, the length of each attenuation channel 3211 is adjusted to meet the requirements.

[0060] It should be noted that the signal attenuation module 32 provided in this embodiment ensures the accuracy of calibration of the linear equalizer 30 by simulating an actual communication transmission environment, thereby avoiding the inaccuracy of direct testing.

[0061] like Figure 6 As shown, the linear equalizer 30 receives the attenuation signal and adjusts the linear equalizer 30 to different gears for gain compensation to generate different compensation signals.

[0062] Specifically, the linear equalizer 30 is configured as a chip, which includes at least a continuous time linear equalizer (CTLE) therein. The continuous time linear equalizer is a linear analog high-pass filter applied to the receiver, which compensates for the attenuation ratio near the Nyquist frequency by attenuating the low-frequency signal component to achieve channel compensation. Under the IEEE 802.3bm standard, 4-channel transmission is set, and the frequency value of each channel is 25.78 Gbps. The upper limit of the insertion loss of the channel at the Nyquist frequency of 14 GHz is 10 dB (therefore, the maximum compensation gain value is set to 9db).

[0063] In this embodiment, the linear equalizer 30 itself sets different gain values ​​based on the preset gears, and calls the gain through the code value. Therefore, when the gain compensation of the current gear to be tested cannot be fully compensated, it is necessary to consider that each gear has a deviation and call the actual gain that needs to be compensated by modifying the corresponding code value.

[0064] like Figure 6 As shown, the test signal receiving module 33 receives each compensation signal, and adjusts the actual gain value corresponding to the linear equalizer 30 at the gear to be tested based on the difference between each compensation signal and the test signal.

[0065] Specifically, by comparing the compensation signal with the test signal, it can be analyzed whether the signal has achieved the expected equalization effect after being processed by the linear equalizer 30. If the difference between the compensation signal and the test signal is large, it means that the current setting of the linear equalizer 30 may not be accurate enough and needs further adjustment. Specifically, the comparison process and the calibration process can be performed by manually adjusting the parameters of the linear equalizer 30 or automatically adjusting the adaptive algorithm.

[0066] In this embodiment, the optimal gear corresponding to the smallest difference among the gears in the linear equalizer 30 can be obtained by comparing the difference, and the gain called by the code value of the gear should be used as the actual gain, so the code value of the gear to be tested is modified to the code value corresponding to the optimal gear to adjust the actual gain value. The specific adjustment method is not limited to this embodiment, and the actual gain value can also be adjusted by directly modifying the gain ratio and other settings inside the linear equalizer 30, which is not limited to this embodiment.

[0067] like Figure 6 As shown, the linear equalizer compensation gain calibration system 3 also includes a capacitor isolation module 34; the capacitor isolation module 34 is arranged between the signal attenuation module 32 and the linear equalizer 30. By introducing the capacitor isolation module 34, electrical isolation is ensured to prevent direct electrical connection between two adjacent modules, thereby improving safety and anti-interference capabilities. In this embodiment, the capacitor isolation module 34 is configured as two capacitors, and the two capacitors are respectively arranged in series between the signal attenuation plate 321 and the input channel of the linear equalizer 30.

[0068] like Figure 8 As shown, this embodiment provides a linear equalizer compensation gain calibration method, which is implemented based on the above-mentioned linear equalizer compensation gain calibration system 3, including:

[0069] S1. Generate a test signal with a preset transmission rate and attenuate the test signal according to a preset attenuation value corresponding to a gear position to be tested of a linear equalizer to generate an attenuated signal.

[0070] In this embodiment, if the preset attenuation value of the gear to be tested is 3db, the signal attenuation module 32 is used to attenuate 3db, which is convenient for subsequent calibration. Fig. 9 As shown in , the eye diagram is closed and crosstalk occurs between channels. Fig.10 As shown, attenuation channels of different lengths can obtain different attenuation values, and the test signal can be attenuated at a preset attenuation value by adjusting the connected attenuation channel.

[0071] S2. Adjust the linear equalizer 30 to different gears for gain compensation to generate different compensation signals.

[0072] In this embodiment, attenuation is first performed by the signal attenuation module 32 with a standard value, and then compensation is performed by the linear equalizer 30. During compensation, it is necessary to check whether the actual gain value of the gear to be tested can compensate for the previous attenuation. If it can be compensated, it means that the linear equalizer 30 does not need to be calibrated; if it cannot completely compensate for the previous attenuation, it is necessary to further calibrate the gear of the linear equalizer 30. Fig.11 As shown, the eye diagram is now open and there is no crosstalk between channels.

[0073] S3. Based on the difference between each compensation signal and the test signal, adjust the actual gain value of the linear equalizer 30 corresponding to the gear position to be tested.

[0074] In this embodiment, when the difference between the compensation signal and the test signal is small, it can be determined that the compensation is complete, and there is no need to adjust the gain of the gear to be tested. However, when the difference between the compensation signal and the test signal is large, it is determined that the compensation is not complete, then it is necessary to adjust the gain corresponding to the gear to be tested. In this embodiment, the gain is adjusted by changing the internal code value of the linear equalizer 30, so the gain is adjusted by changing the code value corresponding to the gear to be tested, thereby ensuring that the gain of each gear of the linear equalizer 30 is accurate.

[0075] It should be noted that the difference between the compensation signal and the test signal is relatively small and is generally set according to the actual communication protocol requirements. In this embodiment, it is considered that the difference between the compensation signal and the test signal is less than or equal to 1.00E-11, and the compensation is considered complete.

[0076] Specifically, in this embodiment, the gain value corresponding to the time when the difference between each compensation signal and the test signal is the smallest is taken as the actual gain value.

[0077] In this embodiment, the code value corresponding to the gear to be tested is adjusted so that the gain of the gear to be tested is changed to obtain different compensation signals; by comparing the difference between the compensation signal and the test signal under different gains, it is convenient to obtain the minimum difference between a certain compensation signal and the test signal, and the code value corresponding to the compensation signal at this time is recorded and its corresponding preset attenuation value is used as the actual gain value corresponding to the gear to be tested.

[0078] As an example, the preset attenuation value with the smallest difference between each compensation signal and the test signal is searched in at least one of linear traversal and bidirectional traversal.

[0079] In the present embodiment, linear traversal refers to starting from one end of the data structure and accessing each element in sequence in the linear order of the elements until reaching the other end. Two-Way Traversal refers to that when traversing the data structure, both forward and backward access can be made. In the present embodiment, each gear is read in sequence from small to large according to the preset gain value through linear traversal, and then the gain of the linear equalizer 30 is adjusted to change linearly, which is convenient for comparison and calibration in sequence. Specifically, when the measuring gear is the 5th gear, the signal attenuation module 32 attenuates 5db as a standard, and the linear equalizer 30 is tested with the gear from small to large, and the following table is obtained:

[0080]

[0081] Among them, the first, second and third tests are respectively conducted on three linear equalizer chips. It can be seen that the difference between the compensation signal and the test signal after compensation from the 3rd gear to the 7th gear is small, which can be regarded as complete compensation in this embodiment. Therefore, the gain corresponding to the 5th gear to be tested does not need to be calibrated. In another embodiment, since the difference between the compensation signal and the test signal after compensation from the 3rd gear to the 7th gear is small, the gain corresponding to the middle gear (5th gear) between the 3rd gear to the 7th gear is taken as the optimal gain.

[0082] It should be noted that the linear equalizer compensation gain calibration method of this embodiment can also be implemented without traversal, such as taking the gear to be tested as the center and testing two adjacent gears, stopping when it is obviously found that the difference is large, and then searching for the actual gain value corresponding to the minimum difference between the compensation signal and the test signal. The actual calibration method is not limited to this embodiment.

[0083] It should be further explained that this embodiment provides a linear equalizer compensation gain calibration system and calibration method. After the signal attenuation module 32 is attenuated by 7db, the linear equalizer 30 chip under different process conditions is tested, and the following results are obtained: Fig.12 The test curves shown in the figure show that different chips (from the first chip to the fifth chip) have different final test values ​​at different gears and the compensation is considered complete when the test value is the smallest. Therefore, the gain compensation of different chips at different gears is different. This is verified by using the calibration method of this embodiment. It can be found that all chips have achieved complete compensation at the seventh gear, but some chips have completed compensation at smaller gears such as the fifth gear or the sixth gear. Therefore, their code values ​​need to be adjusted according to the actual test results.

[0084] In summary, the present invention provides a linear equalizer compensation gain calibration system and calibration method, wherein the linear equalizer compensation gain calibration system includes a test signal generating module, a signal attenuation module, a linear equalizer and a test signal receiving module; the test signal generating module is used to generate a test signal with a preset transmission rate; the signal attenuation module attenuates the test signal with a preset attenuation value to obtain an attenuated signal; the linear equalizer receives the attenuated signal, and compensates the attenuated signal with a preset attenuation value corresponding to the gear to be tested to obtain a compensation signal; the test signal receiving module receives the compensation signal, and adjusts the actual gain value corresponding to the gear to be tested of the linear equalizer based on the difference between the compensation signal and the test signal. The present invention simulates the attenuation in a high-speed transmission environment by setting an attenuation channel, and uses standardized attenuation as a measurement standard to calibrate the gains of each gear of the linear equalizer. Therefore, the present invention effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.

[0085] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A linear equalizer compensation gain calibration system, used for calibrating a linear equalizer, characterized in that: The linear equalizer compensation gain calibration system at least includes: a test signal generating module, a signal attenuation module, a linear equalizer and a test signal receiving module; The test signal generating module is used to generate a test signal with a preset transmission rate; The signal attenuation module receives the test signal and attenuates the test signal with a preset attenuation value to generate an attenuated signal, wherein the preset attenuation value is set corresponding to a preset gain value of the gear to be tested of the linear equalizer; The linear equalizer receives the attenuated signal and adjusts the linear equalizer to different gears for gain compensation to generate different compensation signals; The test signal receiving module receives each of the compensation signals, and adjusts the actual gain value of the linear equalizer corresponding to the gear position to be tested based on the difference between each of the compensation signals and the test signal.

2. The linear equalizer compensation gain calibration system according to claim 1, characterized in that: The linear equalizer compensation gain calibration system further includes a capacitance isolation module; the capacitance isolation module is arranged between the signal attenuation module and the linear equalizer.

3. The linear equalizer compensation gain calibration system according to claim 1, characterized in that: The test signal is set as a single-ended signal or a differential signal.

4. The linear equalizer compensation gain calibration system according to claim 3, characterized in that: When the test signal is set as a single-ended signal, the signal attenuation module includes a signal attenuation board to receive the corresponding single-ended signal; when the test signal is set as a differential signal, the signal attenuation module includes two signal attenuation boards to respectively receive the corresponding differential signals; The signal attenuation board is provided with N attenuation channels with preset lengths, and the test signal is attenuated through at least one of the attenuation channels, where N is an integer greater than or equal to 1.

5. The linear equalizer compensation gain calibration system according to claim 4, characterized in that: When N is an integer greater than or equal to 2, the preset lengths of the attenuation channels are different.

6. The linear equalizer compensation gain calibration system according to claim 4, characterized in that: The test signal is attenuated through the plurality of attenuation channels connected in series.

7. The linear equalizer compensation gain calibration system according to any one of claims 4 to 6, characterized in that: The signal attenuation plate is configured as a printed circuit board; and the attenuation channel is configured as a copper conductor on the printed circuit board.

8. A linear equalizer compensation gain calibration method, implemented based on the linear equalizer compensation gain calibration system according to any one of claims 1 to 7, characterized in that: S1, generating a test signal with a preset transmission rate and attenuating the test signal according to a preset attenuation value corresponding to a gear position to be tested of the linear equalizer to generate an attenuated signal; S2, adjusting the linear equalizer to different gears for gain compensation to generate different compensation signals; S3. Based on the difference between each of the compensation signals and the test signal, adjust the actual gain value of the linear equalizer corresponding to the gear position to be tested.

9. The linear equalizer compensation gain calibration method according to claim 8, characterized in that: The gain value corresponding to the minimum difference between each compensation signal and the test signal is taken as the actual gain value.

10. The linear equalizer compensation gain calibration method according to claim 9, characterized in that: The gain value with the smallest difference between each compensation signal and the test signal is searched in at least one of linear traversal and bidirectional traversal.

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