117 results about "Differential line" patented technology

The invention belongs to the technical field of geophysical exploration, and particularly discloses a differential transient electromagnetic method device and an unexploded ordnance detection method thereof.The differential transient electromagnetic method device is characterized in that a transmitter injects emission current into an emission loop, and the emission loop generates a primary field excitation signal; the underground anomalous body target generates a secondary field excitation signal under the action of the primary field excitation signal; the receiving coil assembly is based on the structure of a differential coil, synchronously counteracts a primary field excitation signal and a uniform background signal in an induced voltage, and expands a local asymmetric differential signal generated by an underground anomalous body target; and the receiver carries out time sequence analysis on the local asymmetric differential signals and extracts differential signal features so as to realize positioning and identification of an underground anomalous body target. The device is suitable for detection of shallow-buried small bodies such as UXO, the overall arrangement range of the device is small, and rapid arrangement and mobile observation in the field are facilitated.

An interface for an optical modulator and the optical modulator are described. The interface includes first and second differential line pairs. The first differential line pair has a first negative line and a first positive line arranged on opposing sides of a first waveguide. The first negative line is on a distal side of the first waveguide relative to a second waveguide. The first positive line is on a proximal side of the first waveguide relative to the second waveguide. The second differential line pair has a second negative line and a second positive line arranged on opposing sides of the second waveguide. The second negative line is on a distal side of the second waveguide relative to the first waveguide. The second positive line is on a proximal side of the second waveguide relative to the first waveguide. The first and second waveguides each include lithium niobate and / or lithium tantalate.

The invention discloses a spatial orthogonal differential eddy current probe based on magnetic flux directional extraction and a detection device, the probe is formed by vertically arranging four groups of excitation coils and detection coils with the same parameters in a rectangular-ambulatory-plane manner to form two groups of differential coils; differential signals are taken during detection, if double peaks appear, the defect is judged, the center of the double peaks is the defect position, the amplitude difference delta Vpp is equal to the depth d, the speed v meets the conditions that d = kd * delta Vpp + bd and delta Vpp = kv * v + bv, the array probe works independently, and through real-time calculation of a multi-channel A / D and an FPGA, cracks with the width of 0.5 mm and the positioning error lt can be detected at the speed of 2 m / s under the lift-off of 0.5 mm; 2 mm, the depth error lt; compared with a traditional probe signal, the signal is improved by 3.3 times, the support can be fixed or held by hand, and the device is suitable for online nondestructive testing of metal plates and pipelines.

The invention provides a routing fan-out structure of a back-to-back connector, a printed circuit board and a switch, and relates to the technical field of circuit board design. The wiring fan-out structure comprises a plurality of high-speed differential signal hole pairs which are arranged in the direction perpendicular to the arrangement direction of the connector pins, the wiring difficulty is reduced, and the signal integrity is improved. A first high-speed differential signal hole pair in the plurality of high-speed differential signal hole pairs is used for fan-out of a first high-speed differential line corresponding to a bottom-layer connector, and a second high-speed differential signal hole pair is used for fan-out of a second high-speed differential line corresponding to a top-layer connector. Wherein the first high-speed differential line does not coincide with the second high-speed differential signal hole pair, the second high-speed differential line does not coincide with the first high-speed differential signal hole pair, the non-coincidence design lays a foundation for adopting a through hole technology, the manufacturing cost of a PCB is reduced, in addition, electrical short circuit is avoided when the high-speed differential signal holes are manufactured, and safe and reliable fan-out is achieved. And the printed circuit board is manufactured through one-time pressing, so that the manufacturing cost of the PCB is further reduced.

The utility model relates to the technical field of circuit boards, and discloses a printed circuit board and an electronic device with the printed circuit board. The circuit board comprises a substrate and a circuit pattern printed on the substrate, and an acute included angle is formed between the whole circuit pattern and a glass fiber bundle of a dielectric layer of the substrate. According to the printed circuit board provided by the embodiment of the utility model, by rotating the circuit pattern, an acute included angle is formed between most of the wires in the circuit pattern and the glass fiber bundles of the dielectric layer, so that most of the wires in the circuit pattern can uniformly pass through the windows between the glass fiber bundles; and the delay inequality between the wires caused by the glass fiber effect is reduced, so that the delay inequality in the differential pair of the differential wire is reduced, and the performance of the circuit is improved.

The application discloses a kind of grid shielding structure differential impedance calculation method and system, equipment, medium, the method is based on the conductor width and pitch of grid shielding layer first Calculation obtains escape ratio, then signal escape radiation is equivalent to the increase of dielectric thickness farther, to calculate equivalent dielectric thickness, based on time equivalence principle Calculation obtains the equivalent dielectric constant between electric ground, finally calculates differential impedance.The application first proposes the calculation theory and calculation model of grid shielding structure differential impedance, considers the influence of the escape effect of grid shielding layer on differential impedance calculation, by the signal escape of grid shielding layer is equivalent to the increase of dielectric thickness, and based on time equivalence principle Calculation equivalent dielectric constant, different from the dielectric constant of pure dielectric between transmission line, greatly improve the precision of grid shielding structure differential impedance calculation, can be well applied to the differential line design of grid shielding structure, is conducive to improving the first pass rate of differential impedance design.

The utility model provides a differential circuit structure and electronic equipment, and belongs to the technical field of differential circuits. The differential circuit structure comprises a terminating component which comprises a first port and a second port, the two ports respectively comprise a first wiring terminal, a second wiring terminal, a first metal ring and a second metal ring, and the two metal rings are respectively used for grounding; the wire twisting part comprises a ground wire, and a first signal wire and a second signal wire which spirally surround the ground wire respectively; the first end of the first signal line is connected with the first wiring terminal on the first port, and the second end of the first signal line is electrically connected with the first wiring terminal on the second port; the first end of the second signal wire is connected with the second wiring terminal on the first port, the second end of the second signal wire is electrically connected with the second wiring terminal on the second port, and the two ends of the ground wire are grounded respectively. Compared with a common twisted pair, the differential line structure can reduce electromagnetic radiation more reliably.

The invention provides a cable defect detection method combining electromagnetic induction and dynamic signal analysis, which comprises the following steps: acquiring the advancing speed of an inspection device in real time through an encoder, and dynamically switching excitation signal frequency to adapt to different depth defect detection requirements; s2, pulse excitation is applied to the detection mechanism with the three-coil axial symmetry layout, cable eddy current is excited, and a defect voltage signal is received through a differential coil; s3, analyzing a fluctuation mode of the differential signal, and positioning defects and calculating geometric features in combination with amplitude change and recovery time; s4, associating defect coordinates according to speed and time, and storing the defect coordinates to a microprocessor; and S5, quantitatively evaluating the number of broken strands, the defect depth and the severity level based on the simulation optimization model. According to the device disclosed by the invention, through an electromagnetic induction detection technology of three-coil axial symmetry layout, speed self-adaptive dynamic excitation frequency adjustment and differential signal identification defect positions are combined, so that 360-degree blind area-free detection of the cable in the circumferential direction and high-precision evaluation of the strand breaking depth are realized.

The present disclosure relates to a differential line conversion structure and an antenna device with which further size reduction can be achieved. This differential line conversion structure comprises: a single line in which one wire is disposed; a differential line in which two wires are disposed substantially parallel to each other; a propagation mode conversion region which converts the propagation mode of a signal to be inputted to the differential line at a connection point where one wire constituting the differential line is electrically connected to the wire constituting the single line; and a filter structure which is disposed adjacent to the propagation mode conversion region on the differential line side thereof and suppresses the propagation of a common mode through the differential line. The present technology can be applied to, for example, a differential line conversion structure used in a millimeter-wave radar.

The invention relates to a simulation scanning method for guiding the routing angle of adjacent layers, and the method comprises the steps: building a transmission line model containing two pairs of differential lines with the vertical projections of the adjacent layers coinciding, setting a center coordinate, controlling the two pairs of differential lines to rotate reversely at the same value, scanning the angle, obtaining crosstalk data of different angles through simulation, and improving the amplitude. Therefore, the wiring angle design of adjacent layers is guided. According to the method, two pairs of differential lines of adjacent layers are set as reverse same-value rotation variables, the angle difference and a single variable are associated, control is simplified, and traceability is achieved; a projection center is used as a rotation reference, so that accurate control and reliable simulation are guaranteed; crosstalk data are obtained through angle scanning, quantization limitation is broken through, and efficiency is improved; the data shows that the difference is improved, the optimal angle is selected by combining the assistance with the space limitation, crosstalk exceeding or space waste is avoided, and experience dependence is got rid of.

The application discloses a method for compensating internal skew of a differential via channel, comprising the steps of: calculating skew time between differential signals; using obtained material parameters to establish a model of a PCB and a differential via; simulating the established high-precision differential model to obtain S parameters of the differential via structure through simulation; obtaining S parameters and differential internal skew values of a design measurement to calibrate a scale factor of 3D modeling; optimizing stub length difference h in the differential via structure; comparing whether the optimization result meets a design allowed differential internal skew target value, if yes, optimization is completed, and if not, stub length difference h is continuously optimized. The application occupies small layout and wiring space, and the proposed differential via structure compensates for skew of differential phase in time, effectively avoiding the influence of internal skew.

The invention belongs to the field of circuit design, and discloses a differential line structure, a printed circuit board and electronic equipment. The differential line structure comprises a differential signal line and a capacitor structure; the differential signal line comprises a first signal line and a second signal line, a differential gap is formed between the first signal line and the second signal line, the differential gap comprises a first gap section and a second gap section, and the width of the second gap section is greater than that of the first gap section; and the capacitor structure is arranged in the two gap sections and is used for increasing the capacitance of the first signal line and the second signal line at the second gap section. According to the differential line structure provided by the invention, the capacitor structure is correspondingly arranged in the second gap section, so that the effective gap of the second gap is reduced, the capacitive coupling between the first signal line and the second signal line is increased, and the differential impedance at the second gap is further reduced.

A circuit board includes a first circuit layer, a second circuit layer, a third circuit layer, a first differential line group, a second differential line group, a third differential line group, and a fourth differential line group. The first and third differential line groups are disposed between the first and second circuit layers. The second and fourth differential line groups are disposed between the first and third circuit layers. A first distance exists between the first differential line group and the first circuit layer, a second distance exists between the second differential line group and the first circuit layer, a third distance exists between the third differential line group and the first circuit layer, and a fourth distance exists between the fourth differential line group and the first circuit layer, wherein the first distance is less than the third distance, and the second distance is less than the fourth distance. The conductive structure of the differential lines is composed of graphene, and the insulating structure of the differential lines is composed of graphene oxide. Therefore, the circuit board of this invention can reduce signal loss and possesses a certain degree of heat resistance in high-temperature environments.

The utility model provides a printed circuit board and an optical module. The circuit board comprises a first surface layer and a second surface layer which are opposite, and a first signal layer and a second signal layer which are laminated between the first surface layer and the second surface layer; one end of the circuit board is provided with an electric connection part, and the electric connection part comprises a second transmitting end golden finger and a second receiving end golden finger which are located on the first surface layer, and a first transmitting end golden finger and a first receiving end golden finger which are located on the second surface layer; the first surface layer is provided with a signal processor, a plurality of pairs of receiving differential lines electrically connected with the first receiving end golden finger, the second receiving end golden finger and the signal processor are arranged on the first signal layer, and a plurality of pairs of transmitting differential lines electrically connected with the first transmitting end golden finger, the second transmitting end golden finger and the signal processor are arranged on the second signal layer. Therefore, transmitting end signals and receiving end signals are isolated. According to the invention, the problems of dense PCB high-speed signal lines and wiring caused by the increase of optical module signal channels can be solved, and the high-frequency performance and the anti-interference capability are improved.

The invention provides a camera triggering circuit, method, device and equipment. The circuit comprises a coupling circuit, a differential driving circuit and a camera driving circuit which are connected in sequence, the coupling circuit comprises an optical coupler, the input end of the optical coupler is connected with an initial single-ended signal, and the output end of the optical coupler outputs a TTL signal; the differential driving circuit comprises a differential line driver chip, the input end of the differential line driver chip is connected with a TTL signal, and the output end of the differential line driver chip outputs a differential signal; the camera driving circuit comprises a differential line connector chip and a switch element which are connected, the input end of the differential line connector chip is connected with a differential signal, the output end of the differential line connector chip outputs a trigger level, and the switch element is connected with the trigger level and outputs a signal for triggering camera driving. Therefore, the optical coupler is utilized to realize electrical isolation and block common-mode noise, and differential signals are utilized to improve the anti-interference capability in a complex electromagnetic environment, so that the anti-interference capability of the whole circuit can be remarkably improved.

The embodiment of the invention provides a differential line pair compensation method and equipment, and is applied to the field of circuits. The method is applied to the electronic equipment and comprises the steps that a to-be-compensated differential line pair is determined, the to-be-compensated differential line pair comprises a first differential line and a second differential line, the length of the first differential line is smaller than that of the second differential line, and the length difference between the first differential line and the second differential line is larger than a first threshold value; determining a compensation position, wherein the distance between the compensation position and the receiving end or the transmitting end of the differential line pair to be compensated is smaller than a second threshold value; and compensating the differential line pair to be compensated at the compensation position, wherein the length difference between the first differential line and the second differential line in the compensated differential line pair is smaller than or equal to a first threshold value. Based on the technical scheme, the differential line pairs are compensated at the positions, with the distances from the sending end and / or the receiving end smaller than the second threshold value, in the multiple differential line pairs to be compensated, and the accuracy of the compensation positions of automatic compensation is improved.

This utility model relates to the field of circuit board packaging technology, and in particular to a circuit board and a solid-state drive. The circuit board provided by this utility model sets high-speed differential line pairs as inner layer traces, and uses vias / through holes through the pads of the high-speed differential lines to electrically connect the high-speed connector and the controller. Since the vias / through holes only need to pass through the pads, the number of wiring layers through which the vias / through holes pass is greatly reduced, which makes it possible to use back drilling process to better reduce the number of residual posts and shorten the length of residual posts, effectively reduce signal reflection or crosstalk, and improve signal quality.

A coupler includes a plurality of unit circuits connected to a plurality of differential line pairs and a single-ended line; and a plurality of isolation resistors connected between the plurality of differential line pairs, wherein each unit circuit of the plurality of unit circuits includes: a transformer including a primary side connected to one differential line pair among the plurality of differential line pairs, and a secondary side connected to the single-ended line, and a secondary-side capacitor connected in parallel to the secondary side.

The utility model discloses an anti-EMC radiation circuit for an RJ45 network port, which relates to the technical field of EMC protection and comprises a network transformer module and an information socket connector module. According to the network transformer module, electrical isolation between a primary winding and a secondary winding is achieved through magnetic coupling, interference and fault propagation between different circuits are prevented, and the influence of common-mode interference is reduced; the EMC transmission energy of the network cable is reduced through common-mode inductors on four pairs of differential lines at the processing chip end of the network transformer; through common-mode inductors on four pairs of differential lines at the end, connected with the information socket connector, of the network transformer, radiation signals are restrained, and electromagnetic interference is reduced; the information socket connector module ensures reliable transmission of signals. According to the utility model, the common-mode inductors are additionally arranged at the two ends of the network transformer module, so that EMC transmission energy and radiation signals are effectively reduced, and the anti-interference capability of the whole circuit is improved.

The invention discloses an anti-transition resistance semi-decoupling multi-terminal differential line fault positioning and distance measuring method, belongs to the field of power system relay protection, and solves the problems of complex calculation, weak anti-transition resistance and difficult equipment upgrading caused by multi-terminal data coupling in the existing method. The method comprises the following steps: S1, calculating a distance ratio based on local side voltage and current, and preliminarily positioning a fault branch; s2, constructing an equation containing transition resistance R and fault impedance ZL-1, and generating a transition resistance matrix r and a fault impedance matrix z (dimensionality is adaptive to CPU computing power); s3, denoising through a Hankel matrix and singular value decomposition to obtain an accurate sequence; and S4, verifying the sequence consistency within 20-40ms after the fault, and outputting a result or repositioning. The method is free of iteration and high in transition resistance resistance, the complexity is linearly improved along with the number of T-connection terminals, hardware computing power and old equipment upgrading are adapted, and the method is suitable for a new energy T-connection multi-terminal network.

A communication device includes a duplexer differentially coupled to a receiver and a transmitter. The duplexer may include phase shifters on the differential lines to provide differential received signals to the receiver and receive differential transmission signals from the transmitter for transmission. For example, the phase shifter are positioned such that single-ended received signals may be converted to differential received signals and convert the differential transmission signals to single-ended transmission signals for transmission. Moreover, the phase shifters may provide the single-ended transmission signals to antennas for transmission and to the differential lines of the receiver for cancellation / isolation. Furthermore, the phase shifters may provide the differential received signals to the receiver for reception and provide the single-ended received signals to the differential lines of the transmitter for cancellation / isolation. Accordingly, the duplexer may convey communication signal while reducing signal interference by providing improved isolation.

The invention discloses a PLL (Phase Locked Loop) shared transceiver circuit for a USB3 (Universal Serial Bus 3) interface. The circuit comprises a receiving module, a sending module and a phase-locked loop, and the receiving module is used for receiving data from a differential line and analyzing frequency information from the received data; generating a frequency control word according to the frequency information; the sending module is used for sending data through a differential line; the phase-locked loop is used for generating a recovery clock according to the frequency control word generated by the receiving module, and sending the generated recovery clock to the receiving module and the sending module, so that the receiving module generates a sampling clock according to the recovery clock when sampling data on a differential line, and the sending module sends the sampling clock to the receiving module when sending the data. And taking the recovered clock as a sending clock. The receiving module and the sending module share the same phase-locked loop, the power consumption is low, and the area is small; and the USB3 Link layer and the Physic layer share one clock, so that the design complexity is reduced.

Systems and methods are disclosed for routing differential communication lines to different integrated circuits based on printed circuit board (PCB) unit variants. In one example, a system for routing signals comprises a location for mounting either a first resistor or a second resistor and another location for mounting either a third resistor or fourth resistor, the location for receiving either the first resistor or the second resistor being shaped such that, when populated with the first resistor, the first resistor is in a first orientation, and when populated with the second resistor, the second resistor is in a second orientation perpendicular to the first orientation.

The invention discloses a domain controller PCIe (Peripheral Component Interconnect Express) signal layout and wiring method, a PCB (Printed Circuit Board) and a vehicle. The method comprises the following steps: setting a standard impedance value of a PCIe 3.0 wire to be 80 omega, and setting the length of the PCIe 3.0 wire to be within 3000 mils; wiring of PCIe3.0 routing is set to be inner-layer routing, the routing width is 5.6 mil, and the distance between differential lines is 5.4 mil. According to the method disclosed by the invention, the layout and the wiring of the PCIe3.0 routing are limited in various aspects, so that the layout and the wiring of the PCIe3.0 routing can well cope with a complicated vehicle-mounted environment, and effective transmission and processing of the PCIe3.0 signal are ensured. And the reliability of the corresponding PCB is improved. And furthermore, the reliability and the safety of the whole vehicle are improved. The invention is mainly used in the technical field of vehicles.

The utility model relates to the technical field of Ethernet transmission, and discloses a vehicle-mounted Ethernet transmission circuit and terminal equipment, the vehicle-mounted Ethernet transmission circuit comprises a differential line port, an electric transmission module, a data transmission module and a blocking module with a blocking function; wherein the differential line port is respectively connected with the specified terminal and the blocking module and is used for transmitting electricity and / or data between the specified terminal and the blocking module; the blocking module is respectively connected with the electric transmission module and the data transmission module, and is used for transmitting power to the electric transmission module and transmitting data to the data transmission module based on a blocking function; the electric transmission module is connected with the electric transmission modules corresponding to the other terminals and is used for transmitting electricity with the electric transmission modules corresponding to the other terminals connected with the electric transmission modules; and the data transmission module is connected with the data transmission modules corresponding to the other terminals and is used for transmitting data with the data transmission modules corresponding to the connected other terminals. And the cost is reduced while wiring is simplified.

The invention relates to the field of differential line performance detection, in particular to a differential signal testing system and method for detecting differential line performance, and the method comprises the steps: enabling collected data of a pressure sensor and a temperature sensor to pass through a time domain branch based on an LSTM-KAN architecture, so as to generate a multi-time scale fusion clamping feature; obtaining differential signal frequency domain data of a vector network analyzer test differential line, and generating multiband fusion differential line performance characteristics through a frequency domain branch based on an LSTM-KAN architecture; and passing the multi-time scale fusion clamping features and the multi-band fusion differential line performance features through a regression head based on a cross-modal attention mechanism architecture to generate a comprehensive differential line quality grade. According to the invention, the fluctuation characteristics of the differential line clamped by the test fixture are accurately extracted, the defect characteristics of the multi-band differential line are accurately extracted, and the test accuracy of the performance of the differential line is improved.

The invention discloses a printed circuit board and electronic equipment, and the printed circuit board comprises a multi-layer board and a differential wire. The multi-layer board is provided with a signal via hole, and the signal via hole penetrates through the multi-layer board; the differential wires comprise a first differential wire and a second differential wire, the first differential wire and the second differential wire are located on different laminates, and the first differential wire is electrically connected with the second differential wire through a pair of signal via holes; the pair of signal via holes comprises a first signal via hole and a second signal via hole, and at least one isolated metal piece is arranged between the first signal via hole and the second signal via hole. The structural arrangement of the printed circuit board can reduce the inductive jump of the differential impedance of the differential wire at the position of the signal via hole, and facilitates the optimization of the overall impedance uniformity of the differential channel.

The invention relates to the technical field of electronic wire harness automatic wiring, and discloses an electronic wire harness automatic wiring design method, and the scheme comprises the following steps: 1, designing a function level target; 2, designing a physical level target; 3, designing a process level target; step 4, limitation confirmation of an electrical constraint level; 5, limitation confirmation of the mechanical constraint level is carried out; step 6, limitation confirmation of an environmental constraint level; step 7, using a Dijkstra algorithm and an A * algorithm; step 8, modeling by using a voxelization three-dimensional space; and step 9, thermal-structural coupling analysis. The design of a functional level target in the application is to ensure signal integrity (such as differential line pair delay matching) and power supply and ground loop impedance minimization; the design of the physical level target is to adapt to a three-dimensional space (such as a complex curved surface of an automobile engine cabin) of equipment, and interference between cables and moving parts is avoided.

The utility model relates to the technical field of modularized equipment communication, in particular to a modularized equipment bus system based on a 485 serial port, which comprises host equipment and slave equipment. The host device comprises a first microcontroller (an integrated serial port and a timer), a first 485 transceiver and a host side auxiliary logic circuit. And the logic circuit is connected with the timer output and the serial port sending end, and controls the sending enabling of the first 485 transceiver. And the slave equipment comprises a second microcontroller and a second 485 transceiver. And the 485 transceivers of the host equipment and the slave equipment are connected through a differential line. According to the utility model, the combination of the MCU serial port, the DMA, the timer, the 485 and the auxiliary logic is utilized, the bus communication with high speed, interference resistance, low cost and strong universality is realized, and the bandwidth is easy to expand.

The invention relates to the technical field of digital communication and automation, in particular to a differential communication and power supply collinear system and a control method, and the system comprises a pair of differential lines and shunt equipment, and the pair of differential lines is connected with the shunt equipment; the pair of differential lines comprises a differential transmission line A and a differential transmission line B, the differential transmission line A and the differential transmission line B are connected with a voltage monitoring element, and the voltage monitoring element is used for monitoring the differential voltage of the differential transmission line A and the differential transmission line B; the shunt device comprises a control unit, a switch unit and an energy storage unit, the switch unit and the energy storage unit are respectively connected with the control unit, and the energy storage unit is connected with the pair of differential lines through the switch unit. Compared with the prior art, the differential communication and power supply collinear system and the control method have the advantages that the terminal equipment does not need to design a special power supply line, the energy storage unit of the equipment can be charged in a non-communication gap, the effect of reducing the cost can be achieved, frequent battery replacement is not needed, and the long-term operation and maintenance expenditure is reduced; and the battery is recycled, waste is reduced, and environmental protection benefits are achieved.