Serial signal low-frequency compensation method and circuit

Abstract

The embodiment of the invention provides a serial signal low-frequency compensation method and circuit, and the method comprises the steps: firstly carrying out the gain amplification processing of a serial input signal, and obtaining the serial input signal after signal processing; and performing signal extraction on the serial input signal to obtain a reference signal similar to the serial input signal. Then, low-pass filtering processing is carried out on the reference signal to obtain a serial filtering signal, a low-frequency component compensation signal is determined according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtering signal, signal compensation is carried out on the serial input signal through the low-frequency component compensation signal, and after signal processing, the low-frequency component attenuation data of the serial input signal after signal processing is obtained. And a serial output signal is obtained. Therefore, the compensation of the low-frequency component of the serial communication receiving end signal can be realized, and the transmission quality of the signal is improved.

Description

Technical Field

[0001] The present application relates to the technical field of signal processing, and in particular to a method and circuit for low-frequency compensation of a serial signal. Background Art

[0002] When receiving a communication signal at a communication receiving end, the circuit board and wiring resistance inside the communication receiving end sometimes cause loss to the received communication signal, thereby causing signal attenuation. Therefore, in order to ensure the signal quality of the communication signal, it is necessary to compensate the received communication signal in time to prevent distortion of the communication signal.

[0003] In the current signal compensation scheme, the high-frequency components in the signal are usually compensated based on pre-emphasis / de-emphasis and equalization processing. However, in some serial communication circuits, the circuit board designed for special requirements will cause a large attenuation of the low-frequency components in the signal, causing the signal received by the receiving end to be distorted, resulting in a decrease in the transmission quality of the communication signal.

[0004] Therefore, how to compensate for the attenuation of low-frequency components in communication signals has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] Based on the above problems, in order to compensate for the attenuation of low-frequency components in communication signals, an embodiment of the present application provides a serial signal low-frequency compensation method and circuit.

[0006] The embodiments of the present application disclose the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a serial signal low-frequency compensation method, comprising:

[0008] Performing gain amplification processing on the serial input signal to obtain a serial input signal after signal processing;

[0009] Performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal;

[0010] Performing low-pass filtering on the reference signal to obtain a serial filtered signal; the serial filtered signal is a low-frequency component signal of the serial input signal;

[0011] Determine a low-frequency component compensation signal according to the low-frequency component attenuation data of the serial input signal after the signal processing and the serial filtered signal; the low-frequency component attenuation data is used to characterize the attenuation of the low-frequency component in the serial input signal after the signal processing;

[0012] The serial input signal is signal compensated based on the low-frequency component compensation signal to obtain a serial input compensation signal, and the serial input compensation signal is signal processed to obtain a serial output signal.

[0013] In a possible implementation, the method for determining the low-frequency component attenuation data includes:

[0014] Performing circuit simulation on the serial circuit based on the serial input signal to obtain a frequency response curve; the frequency response curve is a response curve of the serial circuit when receiving the serial input signal;

[0015] A low-frequency component attenuation analysis is performed according to the frequency response curve to determine the low-frequency component attenuation data.

[0016] In a possible implementation, performing low-frequency component attenuation analysis according to the frequency response curve to determine the low-frequency component attenuation data includes:

[0017] Based on the frequency response curve, obtaining a low-frequency component interval of the frequency response curve;

[0018] Determine gain data of each low-frequency component frequency point in the low-frequency component interval;

[0019] The attenuation amount is calculated according to the gain data of each low-frequency component frequency point to determine the low-frequency component attenuation data.

[0020] In a possible implementation, determining the low-frequency component compensation signal according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal includes:

[0021] Perform compensation gain calculation according to the low-frequency component attenuation data to determine compensation gain data;

[0022] The serial filtering signal is subjected to gain processing based on the compensation gain data to obtain the low-frequency component compensation signal.

[0023] In a possible implementation, performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal includes:

[0024] The signal swing of the serial input signal after signal processing is adjusted to a preset swing value range to obtain the reference signal similar to the serial input signal; the swing difference between the reference signal and the serial input signal is not greater than a preset swing threshold.

[0025] In a possible implementation, the performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal further includes:

[0026] Sampling the serial input signal after signal processing according to the clock signal to obtain the reference signal;

[0027] The clock signal is obtained by performing timing synchronization processing based on the reference signal, and a clock signal is provided for signal sampling.

[0028] In a second aspect, an embodiment of the present application provides a serial signal low-frequency compensation circuit, comprising:

[0029] The signal processing module is used to perform gain amplification processing on the serial input signal to obtain a serial input signal after signal processing;

[0030] A signal extraction module, used for performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal;

[0031] A low-pass filtering module, used for performing low-pass filtering on the reference signal to obtain a serial filtered signal; the serial filtered signal is a low-frequency component signal of the serial input signal;

[0032] A signal conditioning module, used to determine a low-frequency component compensation signal according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal; the low-frequency component attenuation data is used to characterize the attenuation of the low-frequency component in the serial input signal after signal processing;

[0033] The signal compensation module is used to perform signal compensation on the serial input signal based on the low-frequency component compensation signal to obtain a serial input compensation signal, and perform signal processing on the serial input compensation signal to obtain a serial output signal.

[0034] In a possible implementation, the signal extraction module includes: a limiting amplifier;

[0035] The input end of the limiting amplifier is connected to the output end of the signal processing module, and the output end of the limiting amplifier is connected to the input end of the low-pass filtering module, and is used to adjust the signal swing of the serial input signal after signal processing to a preset swing value range to obtain the reference signal similar to the serial input signal; the swing difference between the reference signal and the serial input signal is not greater than a preset swing threshold.

[0036] In a possible implementation, the signal extraction module further includes: a sampler and a clock recovery circuit, wherein:

[0037] The input end of the sampler is connected to the output end of the signal processing module, the clock end of the sampler is connected to the output end of the clock recovery circuit, and the output end of the sampler is connected to the input end of the low-pass filter, and is used to perform signal sampling on the serial input signal after signal processing according to the clock signal output by the clock recovery circuit to obtain the reference signal;

[0038] The input end of the clock recovery circuit is connected to the output end of the sampler, and the output end of the clock recovery circuit is connected to the clock end of the sampler, and is used to perform timing synchronization processing based on the reference signal output by the sampler to obtain the clock signal as the clock signal of the sampler.

[0039] In a possible implementation, the signal conditioning module includes: a field effect tube; a first end of the field effect tube is connected to an operating voltage, a control end of the field effect tube is connected to an output end of the low-pass filter, and a second end of the field effect tube is an output end of the signal conditioning module. The serial filtering signal is gained based on the compensation gain data.

[0040] In a third aspect, an embodiment of the present application provides a chip comprising any possible serial signal low-frequency compensation circuit in the second aspect.

[0041] Compared with the prior art, the present application has the following beneficial effects: the embodiment of the present application provides a method and circuit for low-frequency compensation of a serial signal. In the method for low-frequency compensation of a serial signal provided in the embodiment of the present application, firstly, a gain amplification process is performed on the serial input signal, and a signal extraction is performed on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal, and then the reference signal is low-pass filtered to obtain a serial filtered signal, that is, a low-frequency component signal of the serial input signal. Subsequently, a low-frequency component compensation signal is determined according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal. Since the low-frequency component attenuation data is obtained by serial circuit simulation based on the serial input signal, a low-frequency component compensation signal required for signal compensation can be accurately generated based on the attenuation of the low-frequency component in the serial input signal after signal processing and the low-frequency component signal of the serial input signal. Finally, the serial input signal is signal compensated by the corresponding low-frequency component compensation signal, and the same signal processing is performed to obtain the desired serial output signal, thereby realizing the compensation of the low-frequency component of the serial communication receiving end signal and improving the transmission quality of the signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0043] Figure 1 A schematic diagram of the structure of a serial signal low-frequency compensation circuit provided in an embodiment of the present application;

[0044] Figure 2 A flowchart of a serial signal low-frequency compensation method provided in an embodiment of the present application;

[0045] Figure 3 A schematic diagram of a process for determining low-frequency component attenuation data provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of a field effect transistor circuit structure provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of a circuit structure between a linear equalizer and a gain amplifier provided in an embodiment of the present application;

[0048] Figure 6 A circuit structure diagram of a sampler and a clock recovery circuit according to an embodiment of the present application;

[0049] Figure 7 A schematic diagram of the structure of a serial signal low-frequency compensation circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of this application more clear, the following is a further detailed description of this application in combination with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments described in the embodiments of this application are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "include" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] As described above, in the current related signal compensation schemes, the high-frequency components in the signal are usually compensated based on pre-emphasis / de-emphasis and equalization processing. However, in some serial communication circuits, the circuit board designed due to special requirements will cause a large attenuation of the low-frequency components in the signal, causing the signal received by the receiving end to be distorted, resulting in a decrease in the transmission quality of the communication signal.

[0053] In order to solve the above problems, the embodiment of the present application provides a method and circuit for low-frequency compensation of a serial signal. In the method for low-frequency compensation of a serial signal provided in the embodiment of the present application, firstly, a gain amplification process is performed on the serial input signal, and a signal extraction is performed on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal, and then the reference signal is low-pass filtered to obtain a serial filtered signal, that is, a low-frequency component signal of the serial input signal. Subsequently, a low-frequency component compensation signal is determined according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal. Since the low-frequency component attenuation data is obtained by serial circuit simulation based on the serial input signal, the low-frequency component compensation signal required for signal compensation can be accurately generated based on the attenuation of the low-frequency component in the serial input signal after signal processing and the low-frequency component signal of the serial input signal. Finally, the serial input signal is signal compensated by the corresponding low-frequency component compensation signal, and the same signal processing is performed to obtain the desired serial output signal, thereby realizing the compensation of the low-frequency component of the serial communication receiving end signal and improving the transmission quality of the signal.

[0054] Next, firstly based on the serial signal low-frequency compensation circuit in the actual application scenario, the serial signal low-frequency compensation method provided in the embodiment of the present application is introduced through various processing modules and processing devices in the serial signal low-frequency compensation circuit.

[0055] See also Figure 1 , which is a schematic diagram of the structure of a serial signal low-frequency compensation circuit provided in an embodiment of the present application. As shown in the figure, VIN represents a serial input signal input to the serial circuit. After the serial input signal from the outside is input to the signal processing module, the signal processing module performs gain amplification processing on the serial input signal VIN to obtain a serial input signal V1 after signal processing. Subsequently, the signal processing module sends V1 to the signal extraction module, and the signal extraction module extracts the signal V1 to obtain a reference signal V2 that is close to the original serial input signal.

[0056] After the reference signal V2 passes through the low-pass filter, the low-pass filter can filter the low-frequency component signal in the signal separately to obtain a serial filtering signal V3 containing only the low-frequency component signal.

[0057] The serial filter signal V3 is further received by the signal conditioning module, which obtains a specific low-frequency component compensation signal Va for compensating the attenuation of the low-frequency component according to the preset low-frequency component attenuation data of the serial input signal after signal processing and the serial filter signal. Finally, the serial input signal VI N is re-compensated by Va, and the compensated signal is gain-amplified by the original signal processing module to obtain a serial output signal Vout, which can compensate for the attenuation of the low-frequency component in the serial communication receiving end signal.

[0058] It can be seen that in the serial signal low-frequency compensation circuit provided in the embodiment of the present application, when the serial input signal is input into the serial circuit, the signal will be filtered by the signal processing module, the signal extraction module and the low-pass filtering module, so as to obtain a serial filtering signal containing only the low-frequency component signal. Subsequently, the corresponding low-frequency component compensation signal can be obtained by using the low-frequency component attenuation data used to characterize the attenuation of the low-frequency component and the serial filtering signal, so as to realize the attenuation compensation of the low-frequency component in the serial communication receiving end signal, thereby improving the transmission quality of the communication signal in the serial circuit.

[0059] Next, the serial signal low-frequency compensation method in the embodiment of the present application will be introduced in conjunction with the specific embodiment drawings.

[0060] See also Figure 2 , which is a flow chart of a serial signal low-frequency compensation method provided in an embodiment of the present application, and specifically includes the following steps:

[0061] S101: performing gain amplification processing on the serial input signal to obtain a serial input signal after signal processing.

[0062] When the serial circuit first receives the serial input signal, it is necessary to perform gain amplification processing on the serial input signal to enhance the amplitude of the serial input signal to improve the signal quality. In some possible implementations, the gain amplification processing for the serial input signal can be implemented by a linear equalizer and a gain amplifier.

[0063] For details, please refer to Figure 5 , Figure 5 A schematic diagram of a circuit structure between a linear equalizer and a gain amplifier provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the linear equalizer is used to receive the serial input signal VI N and Vc after low-frequency component compensation processing, and the gain amplifier is used to output the serial output signal V1 and the serial output signal Vout.

[0064] After receiving the serial input signal, in order to ensure that the low-frequency components in the signal can be effectively compensated in the future, the high-frequency components in the serial input signal can be compensated by the linear equalizer to obtain the corresponding serial balanced signal. Through the linear equalizer, the frequency response of the input voltage signal can be adjusted to compensate for the signal distortion or distortion caused by the transmission medium. The gain amplifier further amplifies the signal to reach an appropriate level.

[0065] S102: performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal;

[0066] Specifically, the signal extraction module can adjust the swing of the signal to a preset swing value range through a limiting amplifier. The preset swing value range is a range close to the swing of the original serial input signal, and the maximum value and the minimum value of the original serial input signal are respectively used as the upper and lower ranges of the preset swing value range, and the difference between the maximum value and the minimum value is used as the preset swing threshold. In this way, the swing of the reference signal is adjusted to the preset swing value range, so that the swing difference between the reference signal and the serial input signal is not greater than the preset swing threshold, so that the swing of the reference signal is close to the original serial input signal, and then a reference signal close to the serial input signal is obtained.

[0067] S103: Perform low-pass filtering on the reference signal to obtain a serial filtering signal; the serial filtering signal is a low-frequency component signal of the serial input signal.

[0068] In a possible implementation manner, the low-pass filtering process for the reference signal may be completed by a corresponding low-pass filter. This embodiment does not limit the device used to perform the low-pass filtering process.

[0069] S104: Determine a low-frequency component compensation signal according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal; the low-frequency component attenuation data is used to characterize the attenuation of the low-frequency component in the serial input signal after signal processing.

[0070] Furthermore, after obtaining the serial filtering signal containing only the low-frequency component signal, since the serial filtering signal contains only the low-frequency component of the serial input signal, a corresponding low-frequency component compensation signal is obtained according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtering signal.

[0071] In a possible implementation, the low-frequency component attenuation data can be obtained based on the frequency response of the serial circuit when receiving the serial input signal. By measuring the frequency response curve of the serial circuit when receiving the serial input signal, especially the gain or attenuation in the low frequency band, the attenuation of the components of the serial input signal can be intuitively observed. The attenuation degree of the low-frequency part in the frequency response curve can directly represent the attenuation of the serial input signal in the low frequency band, that is, the low-frequency component attenuation data of the serial input signal after signal processing.

[0072] Specifically, the frequency response curve of the serial circuit can be obtained by circuit simulation for the serial circuit. Through circuit simulation tools such as SPI CE, the transmission of a specific serial input signal in a circuit board can be simulated, thereby obtaining the frequency response curve of the serial circuit when receiving the serial input signal. Furthermore, by performing a low-frequency component attenuation analysis on the low-frequency band part of the frequency response curve, the low-frequency component attenuation data can be determined.

[0073] Next, the specific process of determining the low-frequency component attenuation data will be introduced in conjunction with the accompanying drawings of specific embodiments.

[0074] See also Figure 3 , which is a schematic diagram of a process for determining low-frequency component attenuation data provided by an embodiment of the present application, specifically comprising the following steps:

[0075] S201: Based on the frequency response curve, obtain a low-frequency component interval of the frequency response curve.

[0076] First, it is necessary to determine the low-frequency range in the frequency response curve, that is, the low-frequency position in the frequency response curve, and divide the low-frequency component curve in the frequency response curve. Among them, the horizontal axis of the frequency response curve indicates the frequency, and the vertical axis indicates the gain.

[0077] S202: Determine gain data of each low-frequency component frequency point in the low-frequency component interval.

[0078] Then, in the determined low-frequency component interval, a specific gain value of each low-frequency component frequency point on the curve in the interval is determined.

[0079] S203: Calculate the attenuation amount according to the gain data of each low-frequency component frequency point to determine the low-frequency component attenuation data.

[0080] Finally, by calculating the attenuation amount through the gain value at each low-frequency component frequency point, the low-frequency component attenuation data of the entire low-frequency component in the serial input signal after signal processing can be determined.

[0081] In this way, after the low-frequency component attenuation data is obtained, a low-frequency component compensation signal can be generated based on the low-frequency component attenuation data and the serial filtering signal containing only the low-frequency component signal.

[0082] By calculating the compensation gain for the low-frequency component attenuation data, the compensation gain data for compensating the attenuation of the low-frequency component can be calculated based on the attenuation of the low-frequency component in the serial input signal after signal processing. The compensation gain data can be a specific gain amplification value of the low-frequency component.

[0083] After determining the compensation gain data of the specific gain amplification, the serial filter signal containing only the low-frequency component can be gain-processed based on the specific gain amplification value through the field effect tube to obtain the low-frequency component compensation signal.

[0084] The field effect tube has the characteristic of voltage controlling current, so the current between the source and the drain can be controlled by adjusting its gate voltage. In the embodiment of the present application, the gate of the field effect tube may be connected to a low-frequency component voltage signal, and the conduction degree of the field effect tube can be accurately controlled by adjusting the gate voltage.

[0085] By adjusting the gate voltage of the field effect tube, the conduction current of the field effect tube will change, and this changing current is used to generate a compensation signal. The voltage magnitude and phase of this compensation signal can match the attenuated part of the low-frequency component. The voltage of the compensation signal will be superimposed on the original serial input signal to obtain a serial input compensation signal.

[0086] For example, the structure of the field effect tube can be seen in Figure 4 ,exist Figure 4 In the schematic diagram of the field effect tube circuit structure shown in the figure, one end of the field effect tube P1 is connected to the working voltage V dd1 Connection, field effect tube P 1 The control end is connected to the output end of the low-pass filter module, and the field effect tube P 1 The other end is connected to the output end of the signal conditioning module, and the field effect tube P 1It is a P-type field effect transistor. It should be noted that the field effect transistor is only an exemplary device for generating a low-frequency component compensation signal. In actual application scenarios, the low-frequency component compensation signal can also be completed by other devices, which is not specifically limited in this embodiment.

[0087] S105: performing signal compensation on the serial input signal based on the low-frequency component compensation signal to obtain a serial input compensation signal, and performing signal processing on the serial input compensation signal to obtain a serial output signal.

[0088] Finally, the low-frequency component in the serial input signal is compensated by the obtained low-frequency component compensation signal, and the compensated signal is repeatedly processed to obtain the final serial output signal, thereby completing the compensation of the low-frequency component of the serial communication receiving end signal.

[0089] In a possible implementation, a sampler and a clock recovery circuit may also be provided in the signal extraction module.

[0090] See also Figure 6 , which is a circuit structure diagram of a sampler and a clock recovery circuit according to an embodiment of the present application, such as Figure 6 As shown, the input end of the sampler is connected to the output end of the signal processing module, the clock end of the sampler is connected to the output end of the clock recovery circuit, and the output end of the sampler is connected to the input end of the low-pass filter module, which is used to sample the signal output by the signal processing module 12 according to the clock signal Clk recovered by the clock recovery circuit 42 to obtain the reference signal V 2 .

[0091] Among them, the function of the sampler is to sample the serial input signal after signal processing. The operating frequency of the sampler is usually controlled by a clock signal, which ensures that the sampling is performed within the correct time interval.

[0092] Furthermore, the function of the clock recovery circuit is to recover the clock signal from the received signal. Since the clock information may be lost or offset during the transmission of the signal, the existence of the clock recovery circuit can ensure that the sampler samples the signal according to the correct timing. The clock recovery circuit extracts the embedded clock information from the data stream and provides a clock signal to the sampler so that the serial input signal after signal processing can be sampled at the correct time.

[0093] Therefore, the purpose of the sampler and clock recovery circuit working together is to ensure that the reference signal is similar to the serial input signal.

[0094] The embodiment of the present application provides a method for compensating a serial signal at a low frequency. In the method for compensating a serial signal at a low frequency provided by the embodiment of the present application, firstly, a gain amplification process is performed on the serial input signal, and a signal extraction is performed on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal, and then the reference signal is low-pass filtered to obtain a serial filtered signal. Subsequently, a low-frequency component compensation signal is determined according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal. Since the low-frequency component attenuation data is obtained by circuit simulation for the serial input signal, the low-frequency component compensation signal required for signal compensation can be accurately generated based on the attenuation of the low-frequency component in the serial input signal and the low-frequency component signal of the serial input signal. Finally, the serial input signal is signal compensated by the corresponding low-frequency component compensation signal, and the same signal processing is performed to obtain the desired serial output signal, thereby realizing the compensation of the low-frequency component of the serial communication receiving end signal and improving the transmission quality of the signal.

[0095] A serial signal low-frequency compensation circuit provided in an embodiment of the present application is introduced below. The serial signal low-frequency compensation circuit described below and the serial signal low-frequency compensation method described above can correspond to each other.

[0096] See also Figure 7 , which is a schematic diagram of the structure of a serial signal low-frequency compensation circuit provided in an embodiment of the present application, including the following modules:

[0097] The signal processing module 100 is used to perform gain amplification processing on the serial input signal to obtain a serial input signal after signal processing;

[0098] A signal extraction module 200, configured to perform signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal;

[0099] The low-pass filtering module 300 is used to perform low-pass filtering on the reference signal to obtain a serial filtering signal; the serial filtering signal is a low-frequency component signal of the serial input signal;

[0100] The signal conditioning module 400 is used to determine a low-frequency component compensation signal according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal; the low-frequency component attenuation data is used to characterize the attenuation of the low-frequency component in the serial input signal after signal processing;

[0101] The signal compensation module 500 is used to perform signal compensation on the serial input signal based on the low-frequency component compensation signal to obtain a serial input compensation signal, and perform signal processing on the serial input compensation signal to obtain a serial output signal.

[0102] In a possible implementation, the signal extraction module 200 includes: a limiting amplifier;

[0103] The input end of the limiting amplifier is connected to the output end of the signal processing module, and the output end of the limiting amplifier is connected to the input end of the low-pass filtering module, and is used to adjust the signal swing of the serial input signal after signal processing to a preset swing value range to obtain the reference signal similar to the serial input signal; the swing difference between the reference signal and the serial input signal is not greater than a preset swing threshold.

[0104] In a possible implementation, the signal extraction module 200 further includes: a sampler and a clock recovery circuit, wherein:

[0105] The input end of the sampler is connected to the output end of the signal processing module, the clock end of the sampler is connected to the output end of the clock recovery circuit, and the output end of the sampler is connected to the input end of the low-pass filter, and is used to sample the serial input signal after signal processing according to the clock signal output by the clock recovery circuit to obtain a reference signal;

[0106] The input end of the clock recovery circuit is connected to the output end of the sampler, and the output end of the clock recovery circuit is connected to the clock end of the sampler, and is used to perform timing synchronization processing based on the reference signal output by the sampler to obtain the clock signal as the clock signal of the sampler.

[0107] In a possible implementation, the signal conditioning module includes 400: a field effect transistor; a first end of the field effect transistor is connected to an operating voltage, a control end of the field effect transistor is connected to an output end of the low-pass filter, and a second end of the field effect transistor is an output end of the signal conditioning module. The serial filtering signal is gained based on the compensation gain data.

[0108] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, an embodiment of the present application further provides a chip, wherein the chip includes a serial signal low-frequency compensation circuit as in any of the above-mentioned embodiments.

[0109] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for methods and circuits, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments. The methods and circuits described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components indicated as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0110] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A serial signal low frequency compensation method, characterized in that: include: Performing gain amplification processing on the serial input signal to obtain a serial input signal after signal processing; Performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal; Performing low-pass filtering on the reference signal to obtain a serial filtering signal; The serial filtering signal is a low-frequency component signal of the serial input signal; Determining a low-frequency component compensation signal according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal; The low-frequency component attenuation data is used to characterize the attenuation of the low-frequency component in the serial input signal after signal processing; The serial input signal is signal compensated based on the low-frequency component compensation signal to obtain a serial input compensation signal, and the serial input compensation signal is signal processed to obtain a serial output signal.

2. The method according to claim 1, characterized in that The method for determining the low-frequency component attenuation data comprises: Performing circuit simulation on the serial circuit based on the serial input signal to obtain a frequency response curve; the frequency response curve is a response curve of the serial circuit when receiving the serial input signal; A low-frequency component attenuation analysis is performed according to the frequency response curve to determine the low-frequency component attenuation data.

3. The method according to claim 2, characterized in that The performing low-frequency component attenuation analysis according to the frequency response curve to determine the low-frequency component attenuation data includes: Based on the frequency response curve, obtaining a low-frequency component interval of the frequency response curve; Determine gain data of each low-frequency component frequency point in the low-frequency component interval; The attenuation amount is calculated according to the gain data of each low-frequency component frequency point to determine the low-frequency component attenuation data.

4. The method according to claim 1, characterized in that: The step of determining the low-frequency component compensation signal according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal comprises: Perform compensation gain calculation according to the low-frequency component attenuation data to determine compensation gain data; The serial filtering signal is subjected to gain processing based on the compensation gain data to obtain the low-frequency component compensation signal.

5. The method according to claim 1, characterized in that The step of performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal includes: The signal swing of the serial input signal after signal processing is adjusted to a preset swing value range to obtain the reference signal similar to the serial input signal; the swing difference between the reference signal and the serial input signal is not greater than a preset swing threshold.

6. The method according to claim 5, characterized in that The performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal also includes: Sampling the serial input signal after signal processing according to the clock signal to obtain the reference signal; The clock signal is obtained by performing timing synchronization processing based on the reference signal, and a clock signal is provided for signal sampling.

7. A serial signal low frequency compensation circuit, characterized in that: include: The signal processing module is used to perform gain amplification processing on the serial input signal to obtain a serial input signal after signal processing; A signal extraction module, used for performing signal extraction on the serial input signal after signal processing to obtain a reference signal similar to the serial input signal; A low-pass filtering module, used for performing low-pass filtering on the reference signal to obtain a serial filtering signal; The serial filtering signal is a low-frequency component signal of the serial input signal; A signal conditioning module, used for determining a low-frequency component compensation signal according to the low-frequency component attenuation data of the serial input signal after signal processing and the serial filtered signal; The low-frequency component attenuation data is used to characterize the attenuation of the low-frequency component in the serial input signal after signal processing; The signal compensation module is used to perform signal compensation on the serial input signal based on the low-frequency component compensation signal to obtain a serial input compensation signal, and perform signal processing on the serial input compensation signal to obtain a serial output signal.

8. The circuit according to claim 7, characterized in that The signal extraction module includes: a limiting amplifier; The input end of the limiting amplifier is connected to the output end of the signal processing module, and the output end of the limiting amplifier is connected to the input end of the low-pass filtering module, and is used to adjust the signal swing of the serial input signal after signal processing to a preset swing value range to obtain the reference signal similar to the serial input signal; the swing difference between the reference signal and the serial input signal is not greater than a preset swing threshold.

9. The circuit according to claim 7, characterized in that The signal extraction module further includes: a sampler and a clock recovery circuit, wherein: The input end of the sampler is connected to the output end of the signal processing module, the clock end of the sampler is connected to the output end of the clock recovery circuit, and the output end of the sampler is connected to the input end of the low-pass filter, and is used to perform signal sampling on the serial input signal after signal processing according to the clock signal output by the clock recovery circuit to obtain the reference signal; The input end of the clock recovery circuit is connected to the output end of the sampler, and the output end of the clock recovery circuit is connected to the clock end of the sampler, and is used to perform timing synchronization processing based on the reference signal output by the sampler to obtain the clock signal as the clock signal of the sampler.

10. The circuit according to claim 7, characterized in that The signal conditioning module comprises: a field effect tube; a first end of the field effect tube is connected to the working voltage, a control end of the field effect tube is connected to the output end of the low-pass filter, and a second end of the field effect tube is the output end of the signal conditioning module. The serial filtering signal is gained based on the compensation gain data.

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