Data transmission performance optimization circuit, demodulation device and digital isolator

Abstract

The invention discloses a data transmission performance optimization circuit, a demodulation device and a digital isolator, and the demodulation device is suitable for generating a first demodulation signal and a second demodulation signal in the process of demodulating a differential modulation signal. The data transmission performance optimization circuit comprises a first signal adjusting unit which is configured to detect at least one of differential modulation signals and output a first adjusting control signal under the condition that transient common-mode interference is detected in the process that a demodulation device demodulates the differential modulation signals, at least one of the first demodulation signal and the second demodulation signal is adjusted according to the first adjustment control signal, so that the absolute value of the voltage difference value between the first demodulation signal and the second demodulation signal is increased during the transient common-mode interference. According to the invention, the dynamic adjustment of the digital isolator on the CMTI index is realized, so that the performance optimization effect of the digital isolator is comprehensively improved, and the signal transmission performance is greatly improved.

Description

Technical Field

[0001] This application relates to the field of isolated transmission technology, and in particular to a data transmission performance optimization circuit, demodulation device, and digital isolator. Background Technology

[0002] Digital isolators are widely used in electronic equipment and systems. They are mainly used to provide electrical isolation between different circuits or systems, while ensuring the safe transmission of signals, thereby preventing sensitive components of high-voltage systems and operators from being harmed by high-voltage transients, and maintaining signal integrity in high-voltage environments.

[0003] Common Mode Transient Immunity (CMTI) and Propagation Delay (PD) are two key metrics for evaluating the performance of digital isolators. CMTI characterizes the isolator's ability to maintain signal stability in the face of transient interference, while PD characterizes its ability to transmit signals quickly and accurately. However, in related technologies, to ensure fast and accurate signal transmission, the performance of the digital isolator in terms of CMTI is often sacrificed to meet the requirements of PD, resulting in poor signal transmission stability and affecting signal transmission quality. Summary of the Invention

[0004] This application provides a data transmission performance optimization circuit, demodulation device, and digital isolator, which solves the technical problem of poor signal transmission stability of current digital isolators, affecting signal transmission performance. By increasing the voltage difference between the first demodulated signal and the second demodulated signal, the digital isolator achieves dynamic adjustment of the CMTI index, thereby comprehensively improving the performance optimization effect of the digital isolator and greatly improving signal transmission performance.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application provide a data transmission performance optimization circuit applied to a demodulation device, wherein the demodulation device is adapted to generate a first demodulated signal and a second demodulated signal during the demodulation of a differentially modulated signal, and the data transmission performance optimization circuit includes:

[0007] A first signal conditioning unit is configured to detect at least one of the differential modulation signals and, upon detecting transient common-mode interference during the demodulation of the differential modulation signals by the demodulation device, output a first conditioning control signal to adjust at least one of the first demodulated signal and the second demodulated signal according to the first conditioning control signal, such that the absolute value of the voltage difference between the first demodulated signal and the second demodulated signal increases during the transient common-mode interference.

[0008] The data transmission performance optimization circuit proposed in this application detects at least one of the differential modulation signals through a first signal conditioning unit. In the event of transient common-mode interference during the demodulation of the differential modulation signals, a first conditioning control signal is output. This control signal is then used to adjust at least one of the first and second demodulated signals, increasing the voltage difference between them. This dynamically adjusts the digital isolator's performance in terms of CMTI (Common Mode Interference Tolerance) during transient common-mode interference, allowing the digital isolator to maintain good performance in both CMTI and PD (Power Difference). Therefore, this application embodiment can respond promptly to transient common-mode interference, quickly increasing the voltage difference between the first and second demodulated signals, thus significantly improving the CMTI. Furthermore, this application embodiment only adjusts the first and second demodulated signals in the event of transient common-mode interference, without affecting the PD during normal signal transmission. Therefore, the digital isolator can have both low transmission delay and high anti-interference capability during signal transmission, significantly improving its performance and enhancing the reliability and efficiency of high-speed data communication.

[0009] Optionally, in some embodiments of this application, the data transmission performance optimization circuit is further configured to, when the differential modulation signal is in a carrier-free state, adjust the voltage of the second demodulated signal by decreasing the voltage and / or adjust the voltage of the first demodulated signal by increasing the voltage according to the first adjustment control signal; and when the differential modulation signal is in a carrier-carrier state, adjust the voltage of the first demodulated signal by decreasing the voltage and / or adjust the voltage of the second demodulated signal by increasing the voltage according to the first adjustment control signal.

[0010] In this embodiment, the signal conditioning unit dynamically controls the voltage of the first demodulated signal and / or the second demodulated signal when the differential modulation signal is in a carrier-free state and a carrier-loaded state. This increases the absolute value of the voltage difference between the first demodulated signal and the second demodulated signal, significantly reducing the impact of transient common-mode interference on signal transmission, thereby optimizing the CMTI index and improving the stability of signal transmission.

[0011] Optionally, in some embodiments of this application, the data transmission performance optimization circuit further includes a second signal conditioning unit, which is configured to detect at least one of the differential modulation signals to determine the carrier state of the differential modulation signal, and generate a second conditioning control signal according to the first conditioning control signal when it is determined that the differential modulation signal is in a carrier-free state, and generate a third conditioning control signal according to the first conditioning control signal when it is determined that the differential modulation signal is in a carrier-carrying state. The second conditioning control signal is used to perform voltage reduction conditioning on the second demodulated signal and / or voltage increase conditioning on the first demodulated signal, and the third conditioning control signal is used to perform voltage reduction conditioning on the first demodulated signal and / or voltage increase conditioning on the second demodulated signal.

[0012] Optionally, in some embodiments of this application, the demodulation device includes a first comparator, a pre-amplifier circuit, and an envelope detector circuit. The pre-amplifier circuit is adapted to pre-amplify the differential modulation signal and output a first amplified signal and a second amplified signal. The envelope detector circuit is adapted to detect the first amplified signal and the second amplified signal respectively to output a first demodulated signal and a second demodulated signal. The first input terminal of the first comparator is adapted to receive the first demodulated signal, and the second input terminal of the first comparator is adapted to receive the second demodulated signal. The first comparator is adapted to compare the first demodulated signal and the second demodulated signal to output a comparison signal. The voltage at the first input terminal and / or the second input terminal of the pre-amplifier circuit and the first comparator is adjusted and controlled according to the first adjustment control signal, or the voltage at the first input terminal and / or the second input terminal of the first comparator is adjusted and controlled according to the first adjustment control signal.

[0013] In this embodiment, a first comparator compares the first demodulated signal with the second demodulated signal, and generates a first adjustment control signal based on the comparison result when the differential modulation signal is in a carrier state or a carrier-free state. The adjustment control signal is used to increase the voltage difference between the first demodulated signal and the second demodulated signal, which greatly improves the CMTI index and gives the digital isolator a high anti-interference capability during signal transmission.

[0014] Optionally, in some embodiments of this application, the first signal conditioning unit is configured to adjust the voltage at the first input terminal and / or the voltage at the second input terminal of the first comparator according to the first conditioning control signal, so as to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier-free state; and to adjust the pre-amplification circuit according to the first conditioning control signal, so as to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier-carrying state.

[0015] Optionally, in some embodiments of this application, the data transmission performance optimization circuit further includes a second signal conditioning unit;

[0016] The second signal conditioning unit is configured to generate a second conditioning control signal based on at least one of the differential modulation signals and the first conditioning control signal, wherein the second conditioning control signal is used to adjust the voltage at the first input terminal and / or the voltage at the second input terminal of the first comparator to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier-free state;

[0017] The second signal conditioning unit is further configured to generate a third conditioning control signal based on at least one of the differential modulation signals and the first conditioning control signal, wherein the third conditioning control signal is used to adjust and control the first input voltage and / or the second input voltage of the pre-amplification circuit and / or the first comparator to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier state.

[0018] Optionally, in some embodiments of this application, when the voltage at the second input terminal of the first comparator is adjusted according to the first adjustment control signal, the demodulation device further includes a first resistor and a first current source. The first end of the first resistor is connected to the second output terminal of the envelope detection circuit, the second end of the first resistor is connected to the second input terminal of the first comparator, the positive terminal of the first current source is connected to the second end of the first resistor, and the negative terminal of the first current source is connected to a reference ground. The product value between the first resistor and the first current source is adjusted according to the first adjustment control signal.

[0019] This application embodiment utilizes an adjustment control signal to adjust the product value between the first resistor and the first current source, thereby adjusting the voltage at the second input terminal of the first comparator. This effectively controls the increase in the voltage difference between the first demodulated signal and the second demodulated signal, optimizing the CMTI index and improving the signal transmission stability of the digital isolator.

[0020] Optionally, in some embodiments of this application, when the pre-amplification circuit is adjusted according to the first adjustment control signal, the amplitude of the first amplified signal is reduced and / or the amplitude of the second amplified signal is increased according to the first adjustment control signal.

[0021] Optionally, in some embodiments of this application, the pre-amplification circuit includes a first MOSFET, a second MOSFET, a second resistor, and a third resistor. The source of the first MOSFET is connected to a reference power supply, the drain of the first MOSFET is connected to the drain of the second MOSFET, the source of the second MOSFET is connected to a reference ground through a second current source, the gate of the first MOSFET is connected to the reference power supply through a first capacitor, the gate of the first MOSFET is connected to a first terminal of the second resistor, the second terminal of the second resistor is connected to a first terminal of the third resistor and serves as a first output terminal of the pre-amplification circuit, and the second terminal of the third resistor is connected to the drain of the first MOSFET and serves as a second output terminal of the pre-amplification circuit. The ratio between the second resistor and the third resistor is adjusted to decrease according to the first adjustment control signal.

[0022] In this embodiment, adjusting the control signal adjusts the ratio between the second and third resistors, thereby adjusting the amplitude of the carrier state. This, in turn, increases the voltage difference between the first and second demodulated signals, optimizing the CMTI index and improving the signal transmission stability of the digital isolator.

[0023] Optionally, in some embodiments of this application, the first signal conditioning unit includes a second comparator and a third comparator. The first input terminal of the second comparator is adapted to receive a first detection signal, and the second input terminal of the second comparator is adapted to receive a first reference voltage value. The first input terminal of the third comparator is adapted to receive the first detection signal, and the second input terminal of the third comparator is adapted to receive a second reference voltage value. The first conditioning control signal is output based on the output results of the second comparator and the third comparator when the first detection signal is greater than the first reference voltage value or less than the second reference voltage value. The first detection signal is one of the differential modulation signals or a signal representing the sum of the differential modulation signals, and the first reference voltage value is greater than the second reference voltage value.

[0024] The embodiments of this application use a second comparator and a third comparator to detect common-mode interference. With a simple circuit structure, it can respond promptly to the common-mode interference output adjustment control signal to ensure that the digital isolator has a high CMTI index when a common-mode change is detected, so that the digital isolator can take into account the performance of both CMTI and PD indexes.

[0025] Optionally, in some embodiments of this application, the second signal conditioning unit includes a fourth comparator, the second signal conditioning unit generates a second detection signal based on at least one of the differential modulation signals, a first input terminal of the fourth comparator is adapted to receive the second detection signal, a second input terminal of the fourth comparator is adapted to receive a third reference voltage value, and generates the second conditioning control signal and the third conditioning control signal based on the first conditioning control signal and the signal output by the fourth comparator, wherein the signal output by the fourth comparator characterizes the carrier state of the differential modulation signal.

[0026] Optionally, in some embodiments of this application, if no transient common-mode interference occurs during the demodulation of the differential modulation signal by the demodulation device, then

[0027] When the differential modulation signal is in a carrier-free state, and when the first demodulated signal is greater than the second demodulated signal and the first demodulated signal and the second demodulated signal are in a stable state, the voltage difference between the first demodulated signal and the second demodulated signal is less than the first preset voltage.

[0028] When the differential modulation signal is in a carrier state, and when the first demodulated signal is less than the second demodulated signal and the first demodulated signal and the second demodulated signal are in a stable state, the voltage difference between the first demodulated signal and the second demodulated signal is less than the second preset voltage.

[0029] The embodiments of this application can keep the voltage difference between the first demodulated signal and the second demodulated signal at a small level when no transient common-mode interference occurs. This is beneficial to ensure that the digital isolator has a low PD index when no transient common-mode interference occurs, thereby improving the signal transmission efficiency of the digital isolator.

[0030] Secondly, embodiments of this application provide a demodulation device, including the data transmission performance optimization circuit described in the above embodiments.

[0031] The demodulation device proposed in this application embodiment, through the aforementioned data transmission performance optimization circuit, can respond promptly to transient common-mode interference by dynamically adjusting the voltage difference between the first demodulated signal and the second demodulated signal, thereby significantly improving the CMTI index. Furthermore, this application embodiment only adjusts the first and second demodulated signals in the event of transient common-mode interference, without affecting the PD index during normal signal transmission. Therefore, it enables the digital isolator to have both low transmission delay and high anti-interference capability during signal transmission, significantly improving the performance of the digital isolator and contributing to improved reliability and efficiency of high-speed data communication.

[0032] Thirdly, embodiments of this application provide a digital isolator, comprising:

[0033] A modulation device adapted to modulate an initial signal to generate a differentially modulated signal;

[0034] According to the demodulation apparatus described in the above embodiments, the demodulation apparatus is adapted to demodulate the differential modulation signal.

[0035] The digital isolator proposed in this application, through the aforementioned demodulation device, can respond promptly to transient common-mode interference by dynamically adjusting the voltage difference between the first and second demodulated signals, thereby significantly improving the CMTI (Common Mode Interference Test) index. Furthermore, this application only adjusts the first and second demodulated signals in the event of transient common-mode interference, without affecting the PD (Power Delivery) index during normal signal transmission. Therefore, the digital isolator can exhibit both low transmission delay and high anti-interference capability during signal transmission, significantly improving its performance and enhancing the reliability and efficiency of high-speed data communication. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the circuit structure of the receiving end in related technologies;

[0038] Figure 2 This is a schematic diagram of the signal waveform of the demodulated signal in the receiving end of a related technology;

[0039] Figure 3 This is a schematic diagram of the structure of a data transmission performance optimization circuit according to an embodiment of this application;

[0040] Figure 4 A waveform diagram of the demodulated signal in one embodiment of this application is shown.

[0041] Figure 5 A waveform diagram of the demodulated signal in another embodiment of this application is provided;

[0042] Figure 6(a) is a schematic diagram of the circuit structure of the demodulation device in one embodiment of this application;

[0043] Figure 6(b) is a schematic diagram of the circuit structure of the demodulation device in one embodiment of this application;

[0044] Figure 7 This is a schematic diagram of a data transmission performance optimization circuit according to another embodiment of this application;

[0045] Figure 8 This is a schematic diagram of the circuit structure of the voltage regulation unit in one embodiment of this application;

[0046] Figure 9 This is a schematic diagram of the adjustment process of the second signal adjustment unit in one embodiment of this application;

[0047] Figure 10 This is a schematic diagram of the adjustment process of the second signal adjustment unit in another embodiment of this application;

[0048] Figure 11 This is a schematic diagram of the adjustment process of the second signal adjustment unit in yet another embodiment of this application;

[0049] Figure 12 This is a schematic diagram of the circuit structure of the pre-amplifier circuit in one embodiment of this application;

[0050] Figure 13 This is a schematic diagram of the circuit structure of the first signal conditioning unit in one embodiment of this application;

[0051] Figure 14 This is a schematic diagram of the circuit structure of the first signal conditioning unit in another embodiment of this application;

[0052] Figure 15 This is a schematic diagram of the circuit structure of the second signal conditioning unit in one embodiment of this application;

[0053] Figure 16 This is a schematic diagram of the circuit structure of the second signal conditioning unit in another embodiment of this application;

[0054] Figure 17 This is a schematic diagram of the structure of a digital isolator according to an embodiment of this application. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] Digital isolators are widely used in electronic equipment and systems. They are mainly used to provide electrical isolation between different circuits or systems while ensuring the safe transmission of signals. This not only protects operators from high-voltage transients and prevents damage to sensitive components in high-voltage systems, but also maintains signal integrity in high-voltage environments.

[0057] Common isolation techniques used in digital isolators include edge-modulated isolation communication and OOK-modulated isolation communication. These techniques achieve isolated signal transmission through different modulation and demodulation methods. OOK modulation, in particular, modulates and demodulates signals by controlling the presence or absence of a carrier state; a carrier state exists when the signal to be transmitted is high, and no carrier state exists when the signal to be transmitted is low.

[0058] In related technologies, OOK-modulated digital isolators include a transmitter (TX) and a receiver (RX). TX transmits the differential signal to RX. After the differential signal arrives at RX, it needs to be decoded to reconstruct the input signal IN. For example... Figure 1 As shown, RX includes a common-mode transient immunity (CMTI) circuit, a pre-amplifier circuit, an envelope detector circuit, and a comparator circuit.

[0059] After the input signal IN is sent to TX, TX modulates the input signal IN using OOK modulation before it passes through the high-voltage isolation capacitor C. ISO1 and C ISO2 The signal is fed into the RX circuit and processed sequentially by the CMTI circuit, pre-amplification circuit, and envelope detection circuit within the RX circuit to obtain the envelope signal V. A and envelope signal V B1 And the envelope signal V B1 The signal V is obtained at node B after passing through a resistor input. B Signal V A and signal V B The signal is fed into the comparator circuit to obtain the output signal OUT, thereby restoring the input signal IN.

[0060] Common Mode Transient Immunity (CMTI) and Propagation Delay (PD) are two key metrics for evaluating the performance of digital isolators. CMTI refers to the isolator's resistance to common-mode transients such as electrostatic discharge (ESD) and electrical fast transients (EFT). It determines the isolator's ability to maintain signal stability in the face of transient interference. A higher CMTI indicates stronger interference immunity, thus reducing bit error rate and the risk of system failure. In high-speed data transmission, CMTI is particularly important because high-speed signals are more sensitive to interference and more easily affected by transient events. PD refers to the time required for a signal to travel from the input to the output of a digital isolator. It determines the isolator's ability to transmit signals quickly and accurately. A lower PD indicates higher signal transmission efficiency. In high-speed data communication, PD directly affects the overall system performance, especially in terms of data throughput and real-time performance. Lower propagation delay ensures fast and accurate signal transmission, thereby improving the overall system efficiency and response speed.

[0061] However, the design of digital isolators typically requires a trade-off between two metrics: CMTI and PD. Specifically, Figure 2 The signal waveforms at input nodes A and B of the comparator are shown, where signal V A This represents the signal at input node A, signal V. B1 This represents the envelope signal output by the envelope detector circuit, signal V. B This represents the signal at input node B. Before time t1, since the input signal IN is low, there is no carrier state, so the signals INP and INN sent to RX are DC signals, and RX is in a static state. At this time, the voltage difference between input node A and input node B is V1. Between time t1 and time t2, since the input signal IN is high, there is a carrier state, and RX is in a dynamic state. Therefore, the signals INP and INN sent to RX are differential square wave signals, and the pre-amplifier circuit and envelope detector circuit are working normally. At this time, the voltage difference between input node A and input node B is V2. For the CMTI index, the larger V1 and V2 are, the better the performance of the digital isolator in terms of the CMTI index, and the lower the probability of signal misinterpretation at input node A and input node B during transient common-mode events. For the PD index, the smaller V1 and V2 are, the better the performance of the digital isolator in terms of PD index. As a result, when switching between carrier-enabled and carrier-free states, the signals at input node A and input node B can cross over more quickly, that is, T1 and T2 are smaller.

[0062] To ensure signal transmission efficiency, related technologies generally sacrifice the performance of digital isolators in terms of CMTI (Common Centered Transmission Indicator) to meet the requirements of PD (Digital Distribution Indicator). This results in a trade-off between CMTI and PD, making it impossible to optimize both indicators simultaneously. Therefore, digital isolators cannot achieve both signal transmission stability and signal transmission efficiency, thus affecting the signal transmission effect.

[0063] This application provides a data transmission performance optimization circuit 100, which can be applied to a demodulation device 10. The demodulation device 10 is adapted to generate a first demodulated signal V during the demodulation of a differential modulation signal. A Second demodulated signal V B And based on the first demodulated signal V A Second demodulated signal V B Generate the final demodulated signal, such as Figure 3 As shown, the data transmission performance optimization circuit 100 includes a first signal conditioning unit 110, wherein the first signal conditioning unit 110 is configured to detect at least one of the differential modulation signals, and output a first conditioning control signal S1 when transient common-mode interference is detected during the demodulation of the differential modulation signal by the demodulation device 10, so as to adjust the first demodulated signal V according to the first conditioning control signal S1. A Second demodulated signal V B At least one of them is adjusted so that the first demodulated signal V A With the second demodulated signal V B The absolute value of the voltage difference between them increases during transient common-mode interference.

[0064] It should be noted that, Figure 3 The diagram shows a data transmission performance optimization circuit 100 applied within a demodulation unit 10 of a digital isolator. The digital isolator also includes a modulation unit 20 configured to modulate an initial signal to generate a differentially modulated signal. The modulation unit 20 is applied at the transmitting end (TX), and the demodulation unit 10 is applied at the receiving end (RX).

[0065] Furthermore, embodiments of this application may only demodulate the first demodulated signal V. A Voltage regulation can be performed, or only the second demodulated signal V can be regulated. B Voltage regulation can also be performed on the first demodulated signal V. A Second demodulated signal V B Simultaneous voltage regulation allows for dynamic adjustment of the digital isolator's CMTI performance during transient common-mode interference, enabling the digital isolator to achieve good performance in both CMTI and PD metrics. Therefore, the embodiments of this application can respond promptly to transient common-mode interference and quickly adjust the first demodulated signal V.A With the second demodulated signal V B The increased voltage difference between them significantly improved the CMTI index.

[0066] This embodiment of the application only modulates the first demodulated signal V in the event of transient common-mode interference. A Second demodulated signal V B Adjustments will not affect the PD index during normal signal transmission. Therefore, the digital isolator can have both low transmission delay and high anti-interference capability during signal transmission, which significantly improves the performance of the digital isolator and is conducive to improving the reliability and efficiency of high-speed data communication.

[0067] Furthermore, in some embodiments of this application, during the demodulation of the differential modulation signal by the demodulation device 10, if no transient common-mode interference occurs, then when the differential modulation signal is in a carrier-free state, when the first demodulated signal V... A Greater than the second demodulated signal V B And the first demodulated signal V A Second demodulated signal V B When in a stable state, the first demodulated signal V A With the second demodulated signal V B The voltage difference between them is less than the first preset voltage; when the differential modulation signal is in a carrier state, when the first demodulated signal V A Less than the second demodulated signal V B And the first demodulated signal V A Second demodulated signal V B When in a stable state, the first demodulated signal V A With the second demodulated signal V B The voltage difference between them is less than the second preset voltage.

[0068] Therefore, the embodiments of this application can enable the first demodulated signal V to be rendered even when transient common-mode interference does not occur. A With the second demodulated signal V B Maintaining a small voltage difference between the two isolators helps ensure that the digital isolator has a low PD index when no transient common-mode interference occurs, thereby improving the signal transmission efficiency of the digital isolator.

[0069] In the embodiments of this application, when the differential modulation signal is in a carrier-free state, the carrier state is defined as 0, and when the differential modulation signal is in a carrier-carrier state, the carrier state is defined as 1.

[0070] Furthermore, in some embodiments of this application, the data transmission performance optimization circuit 100 is also configured to, when the differential modulation signal is in a carrier-free state, adjust the second demodulated signal V according to the first adjustment control signal S1. B Perform voltage reduction regulation and / or adjust the first demodulated signal V A Voltage increase regulation is performed. The data transmission performance optimization circuit 100 is also configured to, when the differential modulation signal is in a carrier state, adjust the first demodulated signal V according to the first adjustment control signal S1. A Perform voltage reduction regulation and / or adjust the second demodulated signal V B Adjust the voltage by increasing it.

[0071] Specifically, in some embodiments of this application, such as Figure 4 As shown, the red curve represents the first demodulated signal V. A The green curve represents the regulated second demodulated signal V. B The signal waveform. Wherein, with the carrier state at 0, if no transient common-mode interference occurs, the first demodulated signal V... A With the second demodulated signal V B The voltage difference between them is V1. With carrier state 1, if no transient common-mode interference occurs, the first demodulated signal V... A With the second demodulated signal V B The voltage difference between them is V2.

[0072] If the first signal conditioning unit 110 detects transient common-mode interference during the demodulation process when the carrier state is 0, it adjusts the second demodulation signal V. B The voltage decreases, causing the first demodulated signal V to... A Second demodulated signal V B The voltage difference increases from V1 to V3 and remains at V3 until the transient common-mode interference is eliminated. Therefore, the embodiments of this application can dynamically adjust the first demodulated signal V in the event of transient common-mode interference. A Second demodulated signal V B The voltage difference increases.

[0073] In other embodiments of this application, the first signal conditioning unit 110 may also be configured to condition the first demodulated signal V. A The voltage increases, or the first demodulated signal V is adjusted. A The voltage is increased and the second demodulated signal V is adjusted. B The voltage decreases so that the first demodulated signal V A Second demodulated signal V B The voltage difference increases from V1 to V3.

[0074] Therefore, in this embodiment, the first signal conditioning unit 110 conditions the second demodulated signal V when the differential modulation signal is in a carrier-free state. B The voltage dynamic control is used to control the first demodulated signal V. A Second demodulated signal V B By increasing the voltage difference between the two, the impact of transient common-mode interference occurring in the carrier-free state on signal transmission is significantly reduced, thereby optimizing the CMTI index and improving the stability of signal transmission.

[0075] In some embodiments of this application, such as Figure 5 As shown, the yellow curve represents the first demodulated signal V. A The signal waveform, the blue curve represents the regulated second demodulated signal V. B The signal waveform. Wherein, with the carrier state at 0, if no transient common-mode interference occurs, the first demodulated signal V... A With the second demodulated signal V B The voltage difference between them is V1. With carrier state 1, if no transient common-mode interference occurs, the first demodulated signal V... A With the second demodulated signal V B The absolute value of the voltage difference between them is V2.

[0076] When the carrier state is 1, if the first signal conditioning unit 110 detects transient common-mode interference during the demodulation process, it adjusts the first demodulation signal V. A The voltage decreases, causing the first demodulated signal V to... A Second demodulated signal V B The voltage difference increases from V2 to V4 and remains at V4 until the transient common-mode interference is eliminated. Therefore, this embodiment of the application can dynamically adjust the first demodulated signal V in the event of transient common-mode interference. A Second demodulated signal V B The voltage difference increases.

[0077] In other embodiments of this application, when the carrier state is 1, if the first signal conditioning unit 110 detects transient common-mode interference during the demodulation process, it can also adjust the second demodulation signal V. B The voltage increases, causing the first demodulated signal V to... A Second demodulated signal V B The voltage difference increases from V2 to V4 and remains at V4 until the transient common-mode interference is eliminated.

[0078] In some other embodiments of this application, when the carrier state is 1, the first demodulation signal V can also be adjusted. A The voltage decreases, and the second demodulated signal V is adjusted simultaneously.B The voltage increases, causing the first demodulated signal V to... A Second demodulated signal V B The voltage difference increases from V2 to V4 and remains at V4 until the transient common-mode interference is eliminated.

[0079] In some other embodiments of this application, when the carrier state is 1, the second demodulation signal V can be slightly reduced. B The voltage, while significantly reducing the first demodulated signal V A The voltage causes the first demodulated signal V to... A Second demodulated signal V B The voltage difference increases from V2 to V4 and remains at V4 until the transient common-mode interference is eliminated.

[0080] Therefore, it can be seen that the embodiments of this application can demodulate the first demodulated signal V. A Second demodulated signal V B Various adjustments are made to increase the voltage difference. The above description only illustrates some of the adjustment methods and is not intended to limit this application.

[0081] Therefore, in this embodiment, the first signal conditioning unit 110 conditions the first demodulated signal V when the differential modulation signal is in a carrier state. A Second demodulated signal V B By increasing the absolute value of the voltage difference between the two, the impact of transient common-mode interference occurring in carrier state on signal transmission is significantly reduced, thereby optimizing the CMTI index and improving the stability of signal transmission.

[0082] Further, as shown in Figures 6(a) and 6(b), the demodulation device 10 includes a first comparator 200, a pre-amplifier circuit 300, and an envelope detector circuit 400. The pre-amplifier circuit 300 is adapted to pre-amplify the differential modulation signal and output a first amplified signal and a second amplified signal. The envelope detector circuit 400 is adapted to detect the first amplified signal and the second amplified signal respectively to output a first demodulated signal V. A Second demodulated signal V B The first input terminal of the first comparator 200 is adapted to receive the first demodulated signal V. A The second input of the first comparator 200 is adapted to receive the second demodulated signal V. B The first comparator 200 is adapted to demodulate the first signal V. A With the second demodulated signal V B The comparison is performed to output a comparison signal, which can be used to generate the final demodulated signal.

[0083] Among them, as shown in Figure 6(a), Figure 6(b) and Figure 8 As shown, in this embodiment of the application, the voltage at the first input terminal and / or the voltage at the second input terminal of the pre-amplifier circuit 300 and the first comparator 200 are adjusted and controlled according to the first adjustment control signal S1.

[0084] Furthermore, such as Figure 8 As shown, the first signal conditioning unit 110 is configured to adjust and control the voltage conditioning unit 500 according to the first conditioning control signal S1, so as to adjust and control the voltage at the first input terminal and / or the second input terminal of the first comparator 200, so as to adjust the voltage at the first input terminal and / or the second input terminal of the first comparator 200 during transient common-mode interference when the differential modulation signal is in a carrier-free state. A With the second demodulated signal V B The absolute value of the voltage difference between them increases. The pre-amplifier circuit 300 is adjusted and controlled according to the first adjustment control signal S1 to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier state.

[0085] It should be noted that, in this embodiment, the amplitudes of the first amplified signal and the second amplified signal are different. When adjusting the pre-amplification circuit 300 according to the first adjustment control signal S1, the amplitude of the first amplified signal and / or the second amplified signal can be adjusted to regulate the first demodulation signal V. A Second demodulated signal V B The absolute value of the voltage difference between them, for example, can be used to decrease the amplitude of the first amplified signal and / or increase the amplitude of the second amplified signal according to the first adjustment control signal.

[0086] for Figure 8 In the illustrated embodiment, the first adjustment control signal S1 adjusts the pre-amplifier circuit 300 and the voltage adjustment unit 500 in both the carrier-carrier and carrier-free states of the differential modulation signal. When the differential modulation signal is in a carrier-carrier state, the adjustment of the voltage adjustment unit 500 by the first adjustment control signal S1 will cause the second demodulated signal V... B There is a decreasing trend. Therefore, when setting the first adjustment control signal S1 to adjust and control the pre-amplifier circuit 300, it is preferable to adjust and control the amplitude of the first amplified signal by decreasing it and the amplitude of the second amplified signal by increasing it, so that the increase in the amplitude of the second amplified signal can partially or completely offset the second demodulated signal V caused by the adjustment of the voltage adjustment unit 500 by the first adjustment control signal S1. B The reduction of the amplitude of the first amplified signal, and the adjustment of the amplitude of the first demodulated signal V, can make the first demodulated signal V AThis reduction ultimately makes it easier to achieve the first demodulated signal V under the adjustment and control of the first adjustment control signal S1 when the differential modulation signal is in a carrier state. A Second demodulated signal V B The absolute value of the voltage difference between them increases.

[0087] In some embodiments, when the differential modulation signal is in a carrier state, under the action of the first adjustment control signal S1, the pre-amplifier circuit 300 adjusts the second demodulated signal V. B The amplitude regulation function and voltage regulation unit 500 regulate the second demodulated signal V B The regulatory effect is exactly offset, thus achieving... Figure 5 The signal waveform shown.

[0088] In other embodiments, when the differential modulation signal is in a carrier state, under the action of the first adjustment control signal S1, the pre-amplifier circuit 300 adjusts the second demodulated signal V. B The amplitude regulation effect exceeds that of the voltage regulation unit 500 on the second demodulated signal V B The regulating effect of the second demodulated signal V B The size increases.

[0089] In some other embodiments, when the differential modulation signal is in a carrier state, under the action of the first adjustment control signal S1, the pre-amplifier circuit 300 modulates the second demodulated signal V. B The amplitude adjustment effect is slightly less than that of the voltage regulation unit 500 on the second demodulated signal V. B The regulating effect of the second demodulated signal V B It becomes smaller, but the second demodulated signal V needs to be guaranteed. B The reduction is less than that of the second demodulated signal V. B The degree of reduction.

[0090] Specifically, in the absence of transient common-mode interference, the first demodulated signal V A With the second demodulated signal V B Since the voltage difference between them is small, the first signal conditioning unit 110 detects whether transient common-mode interference occurs based on the differential modulation signals INP and INN. When the carrier state is 1, if transient common-mode interference is detected, a corresponding first conditioning control signal S1 is generated. The first conditioning control signal S1 controls the pre-amplifier circuit 300, and can also control the voltage conditioning unit 500 to adjust the first demodulated signal V. A Or the second demodulated signal V B The voltage, thereby increasing the first demodulated signal V A Second demodulated signal V BThe voltage difference V2 between them.

[0091] Therefore, in this embodiment of the application, when the differential modulation signal is in a carrier state and a carrier-free state, the first adjustment control signal S1 is used to make the first demodulated signal V A With the second demodulated signal V B The increased voltage difference between the two sides greatly improves the CMTI index, giving the digital isolator a higher anti-interference capability during signal transmission.

[0092] In some embodiments of this application, such as Figure 7 As shown, the data transmission performance optimization circuit 100 further includes a second signal conditioning unit 120. The second signal conditioning unit 120 is configured to detect at least one of the differential modulation signals INN and INP to determine the carrier state of the differential modulation signal, and generate a second conditioning control signal S2 according to a first conditioning control signal S1 when it is determined that the differential modulation signal is in a carrier-free state, and generate a third conditioning control signal S3 according to the first conditioning control signal S1 when it is determined that the differential modulation signal is in a carrier-carrying state. The second conditioning control signal S2 is used to adjust the second demodulated signal V. B Perform voltage reduction regulation and / or adjust the first demodulated signal V A The voltage is increased and regulated. The third regulation control signal S3 is used to adjust the first demodulated signal V. A Perform voltage reduction regulation and / or adjust the second demodulated signal V B Adjust the voltage by increasing it.

[0093] Furthermore, the second signal conditioning unit 120 is configured to generate a second conditioning control signal S2 based on at least one of the differential modulation signals and the first conditioning control signal S1, wherein the second conditioning control signal S2 is used to adjust and control the voltage at the first input terminal and / or the voltage at the second input terminal of the first comparator 200 to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier-free state.

[0094] The second signal conditioning unit 120 is further configured to generate a third conditioning control signal S3 based on at least one of the differential modulation signals and the first conditioning control signal S1, wherein the third conditioning control signal S3 is used to adjust and control the voltage at the first input terminal and / or the second input terminal of the pre-amplifier circuit 300 and / or the first comparator 200 to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier state.

[0095] This embodiment of the application generates a second adjustment control signal S2 through the second signal adjustment unit 120, which enables dynamic adjustment of the first input voltage and / or the second input voltage of the first comparator 200 in response to transient common-mode interference when the differential modulation signal is in a carrier-free state. This embodiment of the application also generates a third adjustment control signal S3 through the second signal adjustment unit 120, which enables dynamic adjustment of the first input voltage and / or the second input voltage of the pre-amplifier circuit 300 and / or the first comparator 200 in response to transient common-mode interference when the differential modulation signal is in a carrier-carrying state.

[0096] Furthermore, the demodulation device 10 also includes a voltage adjustment unit 500, as shown in FIG6(a). The voltage adjustment unit 500 can be connected to node A and node B respectively, as shown in FIG6(b), or it can be connected between the envelope detection circuit 400 and node B.

[0097] Specifically, in the embodiment shown in FIG6(b), when the voltage at the second input terminal of the first comparator 200 is adjusted according to the first adjustment control signal S1, as follows: Figure 8 As shown, the voltage regulation unit 500 includes a first resistor R1 and a first current source I1. The first end of the first resistor R1 is connected to the second output terminal of the envelope detector circuit 400, and the second end of the first resistor R1 is connected to the second input terminal of the first comparator 200. The positive terminal of the first current source I1 is connected to the second end of the first resistor R1, and the negative terminal of the first current source I1 is connected to a reference ground. The product value between the first resistor R1 and the first current source I1 is adjusted according to the first regulation control signal S1. Specifically, when the product value between the first resistor R1 and the first current source I1 increases according to the first regulation control signal S1, the reference ground... Figure 4 This allows the second demodulated signal V to be reduced even when the differential modulation signal is in a carrier-free state. B This increases the amplitude of the first demodulated signal V. A With the second demodulated signal V B The absolute value of the voltage difference between them. In the embodiment shown in Figure 6(a), the voltage regulation unit 500 connected to node A has a similar circuit structure and the same operating principle as the circuit shown in Figure 6(b). By regulating and controlling the voltage regulation unit 500 shown in Figure 6(b) according to the first regulation control signal S1, the first demodulated signal V can be regulated. A and / or the second demodulated signal V B The adjustment is made to achieve the demodulation of the first demodulated signal V. A With the second demodulated signal V B The adjustment of the absolute value of the voltage difference between them will not be elaborated here.

[0098] like Figure 8As shown, the first adjustment control signal S1 adjusts the pre-amplifier circuit 300 and increases the product value between the first resistor R1 and the first current source I1.

[0099] like Figure 9 As shown, the pre-amplifier circuit 300 is adjusted using the third adjustment control signal S3, and the voltage adjustment unit 500 is adjusted using the second adjustment control signal S2.

[0100] like Figure 10 As shown, the voltage regulation unit 500 is regulated by the third regulation control signal S3 and the second regulation control signal S2.

[0101] like Figure 11 As shown, the pre-amplifier circuit 300 and the voltage regulation unit 500 are adjusted using the third adjustment control signal S3, and the voltage regulation unit 500 is adjusted using the second adjustment control signal S2.

[0102] It should be noted that the above Figures 9 to 11 The illustration shows only one embodiment of the voltage regulation unit 500 and is not intended to limit this application. For example, the voltage regulation unit 500 may also be as shown in FIG. 6(b) and Figure 8 The circuit structure shown connects the voltage regulation unit 500 between the envelope detector circuit 400 and node B.

[0103] Therefore, by generating the second regulation control signal S2 and the third regulation control signal S3 through the second signal conditioning unit 120, not only are the CMTI indicators improved, giving the digital isolator a higher anti-interference capability during signal transmission, but the flexibility of voltage difference regulation is also greatly improved.

[0104] Specifically, when the differential modulation signal is in a carrier-free state, since the carrier state is 0, the differential modulation signals INP and INN are DC signals. At this time, the first demodulated signal V A Second demodulated signal V B The voltage difference V1 between the two is determined by the first resistor R1 and the first current source I1. The voltage difference V1 can be increased by adjusting the product between the first resistor R1 and the first current source I1.

[0105] It should be noted that when adjusting the voltage at the second input terminal of the first comparator 200, the first adjustment control signal S1 and the second adjustment control signal S2 can be used to increase the product value between the first resistor R1 and the first current source I1, and the third adjustment control signal S3 can be used to preferably decrease the product value between the first resistor R1 and the first current source I1.

[0106] This embodiment of the application utilizes a first adjustment control signal S1, a second adjustment control signal S2, and a third adjustment control signal S3 to adjust the product value between the first resistor R1 and the first current source I1, thereby regulating the voltage at the second input terminal of the first comparator 200 and effectively controlling the first demodulated signal V. A Second demodulated signal V B The voltage difference between them is used to optimize the CMTI index when the differential modulation signal is in a carrier-free state, thereby improving the signal transmission stability of digital isolator 1.

[0107] like Figure 12 As shown, in some embodiments of this application, the pre-amplification circuit 300 includes a first MOSFET Q1, a second MOSFET Q2, a second resistor R2, and a third resistor R3. The source of the first MOSFET Q1 is connected to the reference power supply VDD, the drain of the first MOSFET Q1 is connected to the drain of the second MOSFET Q2, the source of the second MOSFET Q2 is connected to the reference ground through a second current source I2, the gate of the first MOSFET Q1 is connected to the reference power supply VDD through a first capacitor, the gate of the first MOSFET Q1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the first end of the third resistor R3 and serves as the first output terminal OUT1 of the pre-amplification circuit 300, and the second end of the third resistor R3 is connected to the drain of the first MOSFET Q1 and serves as the second output terminal OUT2 of the pre-amplification circuit 300. The ratio between the second resistor R2 and the third resistor R3 is adjusted to decrease according to the first adjustment control signal S1.

[0108] Specifically, in some embodiments of this application, the first demodulated signal V A Second demodulated signal V B The voltage difference V2 between the two is mainly determined by the last stage of the pre-amplifier circuit 300. The second resistor R2 and the third resistor R3 are used to attenuate the amplitude of the carrier state. In this way, the input nodes A and B of the first comparator 200 will generate a voltage difference V2 when there is a carrier state. The magnitude of V2 is determined by the ratio between the second resistor R2 and the third resistor R3. Decreasing the ratio between the second resistor R2 and the third resistor R3 will increase V2.

[0109] It should be noted that the pre-amplifier circuit 300 described above is only one embodiment of this application and is not intended to limit this application.

[0110] Therefore, in this embodiment, the first adjustment control signal S1 is used to adjust the ratio between the second resistor R2 and the third resistor R3, thereby achieving amplitude attenuation processing of the carrier state, and thus adjusting the first demodulated signal V. A Second demodulated signal V BThe voltage difference between them is increased to optimize the CMTI index, thereby improving the signal transmission stability of the digital isolator.

[0111] In some embodiments of this application, such as Figure 13 As shown, the first signal conditioning unit 110 includes a second comparator 111 and a third comparator 112. The first input terminal of the second comparator 111 is adapted to receive a first detection signal, and the second input terminal of the second comparator 111 is adapted to receive a first reference voltage value Vref1. The first input terminal of the third comparator 112 is adapted to receive the aforementioned first detection signal, and the second input terminal of the third comparator 112 is adapted to receive a second reference voltage value Vref2. Based on the output results of the second comparator 111 and the third comparator 112, a first conditioning control signal S1 is output when the first detection signal is greater than the first reference voltage value Vref1 or less than the second reference voltage value Vref2, wherein the first reference voltage value Vref1 is greater than the second reference voltage value Vref2.

[0112] The aforementioned first detection signal is one of the differential modulation signals INN and INP, or a signal representing the sum of the differential modulation signals INN and INP. In one example of the embodiments of this application, when the aforementioned first detection signal represents the sum of the differential modulation signals, the first detection signal is the average value of the differential modulation signals (INN+INP) / 2.

[0113] Specifically, in some embodiments of this application, such as Figure 13 As shown, the first signal conditioning unit 110 includes a second comparator 111, a third comparator 112, and an OR gate 113. The first input terminal of the OR gate 113 is connected to the output terminal of the second comparator 111, and the second input terminal of the OR gate 113 is connected to the output terminal of the third comparator 112. The output terminal of the OR gate 113 is used to output a first conditioning control signal S1 when the first detection signal is greater than the first reference voltage value Vref1 or less than the second reference voltage value Vref2.

[0114] In other embodiments of this application, such as Figure 14 As shown, the first signal conditioning unit 110 includes a second comparator 111, a third comparator 112, and an AND gate 114. The first input terminal of the AND gate 114 is connected to the output terminal of the second comparator 111, and the second input terminal of the AND gate 114 is connected to the output terminal of the third comparator 112. The output terminal of the AND gate 114 is used to output a first conditioning control signal S1 when the first detection signal is greater than the first reference voltage value Vref1 or less than the second reference voltage value Vref2.

[0115] During normal operation, the first detection signal is greater than the second reference voltage value Vref2 and less than the first reference voltage value Vref1. The first detection signal can reflect the common-mode interference situation. If the average value of the differential modulation signal deviates from a certain range, it indicates the presence of common-mode interference. In this embodiment, the first detection signal is compared with the corresponding reference voltage value by the second comparator 111 and the third comparator 112, and combined with logical operations to detect when the first detection signal is greater than the first reference voltage value Vref1 or less than the second reference voltage value Vref2, thereby realizing the detection of common-mode interference and generating the first adjustment control signal S1.

[0116] Therefore, the embodiments of this application can respond promptly to the common-mode interference output first adjustment control signal S1 with a simple circuit structure, so as to ensure that the digital isolator has a high CMTI index when the common-mode change is detected, and enable the digital isolator to take into account the performance of both CMTI and PD indexes.

[0117] In some embodiments of this application, the second signal conditioning unit 120 includes a fourth comparator 121. The second signal conditioning unit 120 generates a second detection signal based on at least one of the differential modulation signals INN and INP. The first input terminal of the fourth comparator 121 is adapted to receive the second detection signal, and the second input terminal of the fourth comparator 121 is adapted to receive a third reference voltage value Vref3. The second conditioning control signal S2 and the third conditioning control signal S3 are generated based on the first conditioning control signal S1 and the signal output by the fourth comparator 121. The signal output by the fourth comparator 121 characterizes the carrier state of the differential modulation signal.

[0118] Preferably, in this embodiment of the application, a signal representing the absolute value of the difference between the differential modulation signals is generated based on the differential modulation signal as the second detection signal.

[0119] Specifically, such as Figure 15 As shown, the second signal conditioning unit 120 includes a fourth comparator 121, a first inverter 122, a second AND gate 123, and a third AND gate 124. The input terminal of the first inverter 122 is connected to the output terminal of the fourth comparator 121, and the output terminal of the first inverter 122 is connected to the first input terminal of the second AND gate 123. The second input terminal of the second AND gate 123 is adapted to receive a first conditioning control signal S1, and the output terminal of the second AND gate 123 is used to output a second conditioning control signal S2 when the differential modulation signal is in a carrier-free state. The first input terminal of the third AND gate 124 is adapted to receive the first conditioning control signal S1, and the second input terminal of the third AND gate 124 is connected to the output terminal of the fourth comparator 121. The output terminal of the third AND gate 124 is used to output a third conditioning control signal S3 when the differential modulation signal is in a carrier-carrying state.

[0120] In other embodiments of this application, such as Figure 16 As shown, the second signal conditioning unit 120 includes a fourth comparator 121, a first inverter 122, a fourth AND gate 125, and a fifth AND gate 126. The positive input terminal of the fourth comparator 121 is adapted to receive a third reference voltage value Vref3, and the negative input terminal of the fourth comparator 121 is adapted to receive the absolute value of the difference between the differential modulation signals. The input terminal of the first inverter 122 is connected to the output terminal of the fourth comparator 121, and the output terminal of the first inverter 122 is connected to the first input terminal of the fourth AND gate 125. The second input terminal of the fourth AND gate 125 is adapted to receive a first conditioning control signal S1, and the output terminal of the fourth AND gate 125 is used to output a third conditioning control signal S3 when the differential modulation signal is in a carrier state. The first input terminal of the fifth AND gate 126 is adapted to receive the first conditioning control signal S1, and the second input terminal of the fifth AND gate 126 is connected to the output terminal of the fourth comparator 121. The output terminal of the fifth AND gate 126 is used to output a second conditioning control signal S2 when the differential modulation signal is in a carrier-free state.

[0121] When the second detection signal is less than the third reference voltage value Vref3, it indicates that the differential modulation signal is in a carrier-free state. At this time, through the logical operations of multiple AND gates and inverters, a second adjustment control signal S2 is generated when transient common-mode interference occurs. Similarly, when the second detection signal is greater than the third reference voltage value Vref3, it indicates that the differential modulation signal is in a carrier-carrying state. At this time, through the logical operations of multiple AND gates and inverters, a third adjustment control signal S3 is generated when transient common-mode interference occurs.

[0122] Therefore, the embodiments of this application can respond promptly to the occurrence of transient common-mode interference with a simple logic circuit structure, so as to ensure that the digital isolator has a high CMTI index when the common-mode change is detected, and enable the digital isolator to take into account the performance of both CMTI and PD indexes.

[0123] Accordingly, such as Figure 17 As shown, this application embodiment provides a demodulation device 10, including a data transmission performance optimization circuit 100 as described in the above embodiment.

[0124] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0125] The demodulation device 10 proposed in this application embodiment can respond promptly to transient common-mode interference through the data transmission performance optimization circuit 100, and dynamically adjust the first demodulation signal V. A Second demodulated signal V BThe increased voltage difference significantly improves the CMTI index. Furthermore, this embodiment only modulates the first demodulated signal V in the event of transient common-mode interference. A Second demodulated signal V B Adjustments will not affect the PD index during normal signal transmission. Therefore, the digital isolator can have both low transmission delay and high anti-interference capability during signal transmission, which significantly improves the performance of the digital isolator and is conducive to improving the reliability and efficiency of high-speed data communication.

[0126] Accordingly, such as Figure 17 As shown, this application provides a digital isolator 1, including a modulation device 20 and a demodulation device 10 according to the above embodiment.

[0127] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0128] In this embodiment, the data transmission performance optimization circuit 100 is incorporated within the demodulation device 10. The demodulation device 10 can respond promptly to transient common-mode interference and dynamically adjust the first demodulation signal V. A Second demodulated signal V B The increased voltage difference significantly improves the CMTI index. Furthermore, this embodiment only modulates the first demodulated signal V in the event of transient common-mode interference. A Second demodulated signal V B Adjustments will not affect the PD index during normal signal transmission. Therefore, the digital isolator 1 can have both low transmission delay and high anti-interference capability during signal transmission, which significantly improves the performance of the digital isolator 1 and is conducive to improving the reliability and efficiency of high-speed data communication.

[0129] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

[0130] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0131] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0132] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0133] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0134] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A data transmission performance optimization circuit, characterized by, The demodulation device is used in a demodulation apparatus, which is adapted to generate a first demodulated signal and a second demodulated signal during the demodulation of a differentially modulated signal. The data transmission performance optimization circuit includes: A first signal conditioning unit is configured to detect at least one of the differential modulation signals and, upon detecting transient common-mode interference during the demodulation of the differential modulation signals by the demodulation device, output a first conditioning control signal to condition at least one of the first demodulated signal and the second demodulated signal according to the first conditioning control signal, such that the absolute value of the voltage difference between the first demodulated signal and the second demodulated signal increases during the transient common-mode interference.

2. The data transmission performance optimization circuit of claim 1, wherein, The data transmission performance optimization circuit is configured to, when the differential modulation signal is in a carrier-free state, adjust the voltage of the second demodulated signal by decreasing it and / or adjust the voltage of the first demodulated signal by increasing it according to the first adjustment control signal. When the differential modulation signal is in a carrier state, the voltage of the first demodulated signal is reduced and / or the voltage of the second demodulated signal is increased according to the first adjustment control signal.

3. The data transmission performance optimization circuit of claim 1, wherein, The data transmission performance optimization circuit also includes a second signal conditioning unit. The second signal conditioning unit is configured to detect at least one of the differential modulation signals to determine the carrier state of the differential modulation signal, and to generate a second conditioning control signal according to the first conditioning control signal if it is determined that the differential modulation signal is in a carrier-free state, and to generate a third conditioning control signal according to the first conditioning control signal if it is determined that the differential modulation signal is in a carrier-carrying state. The second conditioning control signal is used to perform voltage reduction conditioning on the second demodulated signal and / or voltage increase conditioning on the first demodulated signal, and the third conditioning control signal is used to perform voltage reduction conditioning on the first demodulated signal and / or voltage increase conditioning on the second demodulated signal.

4. The data transmission performance optimization circuit of claim 1, wherein, The demodulation device includes a first comparator, a pre-amplifier circuit, and an envelope detector circuit. The pre-amplifier circuit is adapted to pre-amplify the differential modulation signal and output a first amplified signal and a second amplified signal. The envelope detector circuit is adapted to detect the first amplified signal and the second amplified signal respectively to output a first demodulated signal and a second demodulated signal. The first input terminal of the first comparator is adapted to receive the first demodulated signal, and the second input terminal of the first comparator is adapted to receive the second demodulated signal. The first comparator is adapted to compare the first demodulated signal and the second demodulated signal to output a comparison signal. The voltage at the first input terminal and / or the second input terminal of the pre-amplifier circuit and the first comparator is adjusted and controlled according to the first adjustment control signal, or the voltage at the first input terminal and / or the second input terminal of the first comparator is adjusted and controlled according to the first adjustment control signal.

5. The data transmission performance optimization circuit of claim 4, wherein, The first signal conditioning unit is configured to adjust the voltage at the first input terminal and / or the voltage at the second input terminal of the first comparator according to the first conditioning control signal, so as to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier-free state; and to adjust the pre-amplification circuit according to the first conditioning control signal, so as to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier-carrying state.

6. The data transmission performance optimization circuit of claim 4, wherein, The data transmission performance optimization circuit also includes a second signal conditioning unit; The second signal conditioning unit is configured to generate a second conditioning control signal based on at least one of the differential modulation signals and the first conditioning control signal, wherein the second conditioning control signal is used to adjust the voltage at the first input terminal and / or the voltage at the second input terminal of the first comparator to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier-free state; The second signal conditioning unit is further configured to generate a third conditioning control signal based on at least one of the differential modulation signals and the first conditioning control signal, wherein the third conditioning control signal is used to adjust and control the first input voltage and / or the second input voltage of the pre-amplification circuit and / or the first comparator to increase the absolute value of the voltage difference during transient common-mode interference when the differential modulation signal is in a carrier state.

7. The data transmission performance optimization circuit of claim 4, wherein, When the voltage at the second input terminal of the first comparator is adjusted according to the first adjustment control signal... The demodulation device further includes a first resistor and a first current source. A first end of the first resistor is connected to a second output terminal of the envelope detection circuit, a second end of the first resistor is connected to a second input terminal of the first comparator, a positive terminal of the first current source is connected to a second end of the first resistor, and a negative terminal of the first current source is connected to a reference ground. The product value between the first resistor and the first current source is adjusted according to the first adjustment control signal.

8. The data transmission performance optimization circuit according to claim 4, characterized in that, When the pre-amplification circuit is adjusted and controlled according to the first adjustment control signal, the amplitude of the first amplified signal is reduced and / or the amplitude of the second amplified signal is increased according to the first adjustment control signal.

9. The data transmission performance optimization circuit according to claim 4, characterized in that, The pre-amplification circuit includes a first MOSFET, a second MOSFET, a second resistor, and a third resistor. The source of the first MOSFET is connected to a reference power supply, and the drain of the first MOSFET is connected to the drain of the second MOSFET. The source of the second MOSFET is connected to a reference ground through a second current source. The gate of the first MOSFET is connected to the reference power supply through a first capacitor. The gate of the first MOSFET is connected to a first terminal of the second resistor. The second terminal of the second resistor is connected to a first terminal of the third resistor and serves as the first output terminal of the pre-amplification circuit. The second terminal of the third resistor is connected to the drain of the first MOSFET and serves as the second output terminal of the pre-amplification circuit. The ratio between the second resistor and the third resistor is adjusted to decrease according to the first adjustment control signal.

10. The data transmission performance optimization circuit according to any one of claims 1-9, characterized in that, The first signal conditioning unit includes a second comparator and a third comparator. The first input terminal of the second comparator is adapted to receive a first detection signal, and the second input terminal of the second comparator is adapted to receive a first reference voltage value. The first input terminal of the third comparator is adapted to receive the first detection signal, and the second input terminal of the third comparator is adapted to receive a second reference voltage value. Based on the output results of the second comparator and the third comparator, the first conditioning control signal is output when the first detection signal is greater than the first reference voltage value or less than the second reference voltage value. The first detection signal is one of the differential modulation signals or a signal representing the sum of the differential modulation signals, and the first reference voltage value is greater than the second reference voltage value.

11. The data transmission performance optimization circuit according to claim 3 or 6, characterized in that, The second signal conditioning unit includes a fourth comparator. The second signal conditioning unit generates a second detection signal based on at least one of the differential modulation signals. The first input terminal of the fourth comparator is adapted to receive the second detection signal, and the second input terminal of the fourth comparator is adapted to receive a third reference voltage value. The second conditioning control signal and the third conditioning control signal are generated based on the first conditioning control signal and the signal output by the fourth comparator. The signal output by the fourth comparator characterizes the carrier state of the differential modulation signal.

12. The data transmission performance optimization circuit according to claim 1, characterized in that, During the demodulation of the differential modulation signal by the demodulation device, if no transient common-mode interference occurs, then When the differential modulation signal is in a carrier-free state, and when the first demodulated signal is greater than the second demodulated signal and the first demodulated signal and the second demodulated signal are in a stable state, the voltage difference between the first demodulated signal and the second demodulated signal is less than the first preset voltage. When the differential modulation signal is in a carrier state, and when the first demodulated signal is less than the second demodulated signal and the first demodulated signal and the second demodulated signal are in a stable state, the voltage difference between the first demodulated signal and the second demodulated signal is less than the second preset voltage.

13. A demodulation device, characterized in that, Includes the data transmission performance optimization circuit according to any one of claims 1-12.

14. A digital isolator, characterized in that, include: A modulation device adapted to modulate an initial signal to generate a differentially modulated signal; The demodulation apparatus according to claim 13 is adapted to demodulate the differential modulation signal.

Images