166 results about "Differential line" patented technology

A non-contact three-dimensional displacement sensor disclosed by the present invention comprises a mechanical probe and a detection circuit, the mechanical probe part comprises a differential fixed block and an end cross beam, and two parallel inner side surfaces of the differential fixed block are fixedly provided with a first differential coil and a second differential coil respectively. A first target conductor located under the first differential coil is fixedly arranged on the top face of the suspension end of the cross beam, and a second target conductor located over the second differential coil is fixedly arranged on the bottom face of the suspension end of the cross beam. A pair of receiving coils Lx is fixedly arranged on the top face of the first target conductor or / and the bottom face of the second target conductor in the horizontal x direction, a pair of receiving coils Ly is fixedly arranged in the horizontal y direction, and the two pairs of receiving coils form a structure shaped like a Chinese character'jing '. The non-contact three-dimensional displacement sensor provided by the invention has better quasi-static resolution and displacement sensitivity in three directions, realizes decoupling in all directions, and has excellent performance in indexes such as linearity, measuring range and the like.

The embodiment of the invention provides a PCB layout optimization method for a finished automobile thermal management system, and relates to the technical field of automobile electronics and electricis.The method comprises the steps that firstly, electronic elements are subjected to electromagnetic interference analysis and grouped according to the electromagnetic interference degree, PCB layout planning is conducted according to the grouping result, and the rough area of each element group on a PCB is determined; detailed component layout is carried out according to the plan, and the orientation and spacing of the components are adjusted according to the electromagnetic radiation characteristics of the components and the layout condition of the surrounding components. Thirdly, during wiring design, not only the length of the line is considered to avoid bending and crossing, but also the line is arranged in the wiring corridor to reduce crossing and coupling; for differential wire pairs, adjacent parallel wiring is adopted to keep tight coupling between the wire pairs, and electromagnetic radiation is reduced. And finally, verifying the effectiveness of the PCB design and adjusting according to requirements until the verification is passed. The PCB layout of the whole vehicle thermal management system is comprehensively optimized, the electromagnetic interference can be effectively reduced, and the system performance is improved.

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.

The utility model relates to an insulating medium structural body and a high-speed cable, the insulating medium structural body is applied to the high-speed cable, the insulating medium structural body comprises an insulating medium body and a hole, and the hole is formed in the insulating medium body; the holes comprise a pair of first holes, the first holes are formed in the insulating medium body and are arranged in an axial symmetry mode, and the pair of first holes are used for penetrating through a pair of conductors to serve as a differential wire pair; the number of the second holes is at least three, and the second holes are formed in the insulating medium body; the second pores are arranged in an axial symmetry mode relative to the symmetry axis of the pair of first pores. The insulating medium is prepared into a structure with pores, and the pores are arranged in axial symmetry relative to the symmetry axis, so that on the premise of ensuring the signal transmission effectiveness of the high-speed cable, on one hand, the structural stability of the high-speed cable is ensured, and the problem of performance variation of the high-speed cable during bending and twisting is avoided; and on the other hand, the signal transmission loss is reduced, thereby reducing the transmission attenuation degree.

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 design method of an electric firing control circuit of a launcher. The launcher is provided with a firing fuse, a secondary firing handle and a firing coil. The control circuit comprises a percussion signal acquisition circuit, a microcontroller and a percussion coil driving circuit. The percussion signal acquisition circuit adopts a four-channel differential line receiver to receive two-stage percussion differential signals of a two-stage percussion handle and one-path differential signals of a percussion fuse, and converts the three paths of differential signals into three paths of high-low level signals, and a microcontroller acquires the three paths of high-low level signals, modulates the three paths of high-low level signals and outputs the modulated high-low level signals to a percussion coil driving circuit; the firing coil driving circuit outputs a firing control signal to the high-power MOS tube after firing arbitration, the high-power MOS tube outputs a driving signal to the firing coil, and the firing coil controls the electromagnet to attract so as to pull the trigger of the launcher, so that the electric firing control of the launcher is realized. The system is simple in design, flexible in control, higher in safety and wider in applicability.

Electrical connector (1) for a data or communication cable with the following features: - a case (10), - first (41) and second contact elements (42), - the first contact elements (41) are connected to the second contact elements (42) via conductor tracks (64, 65), with two conductor tracks (64, 65) forming a differential line (61), - a first circuit board (86), - the first circuit board (86) has compensation units (68), - the first circuit board (86) is at least partially arranged in the housing (10), characterized by the following additional features: - the first circuit board (86) is designed as a flexible circuit board, - the first circuit board (86) is arranged on a support element (75).

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 invention relates to the technical field of connectors, in particular to a cable differential unit structure which comprises a head base, a base portion, a metal shielding clamp, two contact pins and a differential wire. Wherein the two contact pins are fixed in the base part in parallel, two end parts of the contact pins are exposed and are respectively connected with the head base and the differential wire, and the metal shielding clamp is arranged outside the base part and clamps and fixes the differential wire. By arranging the metal shielding clamp, on one hand, the shielding function is achieved, the contact piece is not interfered by external signals, on the other hand, the function of fixing the base and the cable is achieved, meanwhile, the shielding clamp is connected with the ground wire of the differential wire pair to achieve the good shielding function, a complete ground loop is provided for the signal wire pair, and the reliability of the signal wire pair is improved. The consistency of the internal impedance of the connector is ensured; moreover, the device is compact in overall structure, controllable in impedance, good in shielding effect, capable of providing a reliable backflow path for the contact, capable of achieving automatic assembly, low in cost and suitable for batch production and use.

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.