23 results about "Constant impedance" patented technology

The application relates to a unitary coaxial connector, for transmitting radio frequency, RF, signals, having a longitudinal axis X, comprising three coaxial lines that are adjacent along the axis X, are substantially devoid of a solid electrical insulator, have constant nominal impedances on each coaxial line regardless of the length of each of the coaxial lines, the nominal impedances preferably being equal, and at least one of which nests by sliding into another, adjacent one, and the diameters of central and outer contacts of which increase from one longitudinal end of the connector to the other, with a peripheral guide element for guiding and recentering the sliding outer contact over a long movement length.

To provide a shielded terminal that can improve transmission performance. [Solution] The shield terminal 10 comprises two internal conductors 11, a dielectric 12 that houses the two internal conductors 11, and an impedance adjusting member 13 that maintains the electric wires 101 connected to each of the two internal conductors 11 at a constant distance from each other. The impedance adjusting member 13 is positioned and held by the dielectric 12.

The invention belongs to the field of friction electromagnetic hybrid generators, and particularly relates to a multifunctional amorphous alloy-based mutual enhancement friction electromagnetic hybrid generator, which comprises a top plate, an electrode is arranged at the lower end of the top plate, a friction layer is arranged at the lower end of the electrode, and a synergistic layer is arranged at the lower end of the friction layer. A copper coil is arranged at the lower end of the collaboration layer; wherein the synergistic layer and the copper coil are stators, and the top plate, the electrode, the friction layer, the magnet and the bottom plate are rotors. According to the invention, the output current and the current retention rate of the TENG are greatly improved, the output power of the EMG is enhanced, high coupling between the TENG and the EMG is realized, and the overall energy conversion efficiency is improved; meanwhile, the designed self-powered variable impedance system can realize high-efficiency energy utilization without an external power supply management circuit, which is nearly three times of that of the existing constant impedance system, so that the problem of high-efficiency energy collection and utilization is solved.

The utility model relates to the technical field of fixed-resistance sound boxes, and discloses a fixed-resistance sound box with a good damping effect, comprising a U-shaped plate, one side of the U-shaped plate is fixedly connected with two hanging plates, the surfaces of the two hanging plates are both provided with supporting mechanisms for supporting the U-shaped plate, one side of the U-shaped plate far away from the hanging plates is internally provided with a sound box, and two ends of the sound box are both provided with lock holes. A first lock cap and a second lock cap are slidably connected into the two lock holes respectively, a moving mechanism used for moving the second lock cap is arranged on the surface of the side, away from the loudspeaker box, of the second lock cap, a first damper is fixedly connected to the surface of the side, away from the loudspeaker box, of the first lock cap, and the other end of the first damper is fixedly connected to the inner surface of a U-shaped plate; the surface of the first damper is sleeved with a first damping spring, the top end of the first damping spring is fixedly connected to the bottom of the first lock cap, and the bottom end of the first damping spring is fixedly connected to the inner surface of the U-shaped plate. According to the utility model, through the arrangement of the damper, vibration generated by the sound box can be absorbed and cached.

The invention discloses an analog input front-end circuit with constant impedance and high linearity. The analog input front-end circuit comprises an NMOS (N-channel metal oxide semiconductor) source follower, a feed-forward copy capacitor, a level shifting capacitor, a switched capacitor circuit and a sampling capacitor. The drain end of the NMOS source follower M1 adopts a bootstrapping structure, so that the channel modulation effect of the source follower is reduced, and the linearity is improved; the source end adopts a cascode structure to increase impedance, so that the linearity is further improved; according to the analog input front-end circuit, a feed-forward copy capacitor C1 is additionally arranged between the source electrode of the NMOS follower M3 and the grid electrode of the NMOS follower M1. And due to the high output impedance of the M4, the magnitude of the current flowing to the output end M1 of the source follower from the vast majority of the current of the capacitor C1 through the transistor M2 is a constant, and the linearity of the input buffer is improved. And the level shifting capacitor C2 is charged by a switched capacitor circuit. Through the level shifting capacitor C2 and the common-gate NMOS follower M2, the drain end voltage is increased, the problem of change of the source and drain voltage of the NMOS follower M1 is solved, and the nonlinear performance is improved.

The application relates to the field of electromagnetic protection, in particular to an electromagnetic pulse protection circuit and a radio frequency transceiving system. The electromagnetic pulse protection circuit comprises a radio frequency coupling capacitor C3, a first LC branch and a second LC branch. Two series LC branches and the radio frequency coupling capacitor C3 form a basic Pi-type circuit, the two LC branches are connected through a stub STUB between connection nodes, a bidirectional reciprocal constant impedance circuit structure is formed, a strong electromagnetic pulse discharge channel is formed between the stub STUB and the ground, and any device is added between the stub STUB and the ground, so that the impedance between the first connection node K1 and the second connection node K2 is not affected, thereby a constant impedance electromagnetic pulse protection circuit is formed. If a failure occurs in the electromagnetic pulse protection and suppression device in the circuit, whether it is an open circuit or a short circuit, the impedance of the whole circuit is not affected, so that the normal transmission of the radio frequency signal is not affected.

An electronic device may include wireless circuitry. The wireless circuitry may include at least a digital predistortion circuit, an upconversion circuit, and a load-line modulated amplifier circuit. The digital predistortion circuit can be configured to receive a reference baseband signal from one or more processors and to selectively output a predistorted version of the reference baseband signal. The upconversion circuit can be configured to receive a signal from the digital predistortion circuit and to output a radio-frequency signal. The load-line modulated amplifier circuit can be configured to amplify the radio-frequency signal. The load-line modulated amplifier circuit can include an adjustable load component. The adjustable load component can have a constant impedance when an instantaneous signal amplitude of the reference baseband signal is within a first range and can be tuned to have a varying impedance when the instantaneous signal amplitude of the reference baseband signal is within a second range.

A method includes receiving light at a light input of an electro-optic modulator device. The method includes directing the light via the light input into optical waveguides in an optical layer of an electro-optic modulator of the electro-optic modulator device. The method includes receiving a signal at an electric input of the electro-optic modulator device. The electric input is associated with an input impedance. The method includes providing the signal to an electrode structure of the electro-optic modulator. The electrode structure generates an electrical field based on the signal. The electric field modulates light in the optical waveguides to produce modulated light based on the signal. The electrode structure includes a constant impedance section associated with a second impedance less than the input impedance. The method also includes providing the modulated light based on the signal from the optical layer to one or more output optic fibers.

Multi-purpose electrodes for use during ablation are provided. The electrodes comprise a variable impedance region and a relatively constant impedance region. The relatively constant impedance region can be used for mapping, and both regions can be used for ablating. The mapping region can obtain low frequency electrophysiological signals during mapping, while both regions can conduct higher frequency ablation electrical signals to a patient during ablation.

The invention provides a driving circuit and method, a chip and electronic equipment, and relates to the technical field of driving chips. The circuit comprises a sampling circuit, a control circuit and an adjusting circuit, the first end of the sampling circuit is connected with the driving port, the second end of the sampling circuit is connected with the first end of the control circuit, the second end of the control circuit receives driving voltage of the driving port, the third end of the control circuit is connected with the first end of the adjusting circuit, and the second end of the adjusting circuit is connected with the driving port; the sampling circuit is used for sampling the driving current of the driving port to obtain a sampling voltage; the control circuit is used for generating a control voltage according to the driving voltage and the sampling voltage; and the adjusting circuit is used for adjusting the driving current according to the control voltage to enable the driving impedance of the driving port to be constant, so that the problem that the constant impedance cannot be realized due to the fact that the driving impedance is influenced by the driving voltage and the electron mobility of the MOS tube is solved, and the constant driving impedance in a full temperature range is realized.

Provided in the present embodiment are a power amplification circuit, a radio frequency generation device, and a communication system, which are applied in the technical field of wireless communications. The power amplification circuit comprises a first master amplification circuit, a second master amplification circuit, a first slave amplification circuit, a second slave amplification circuit, a first coupler, a second coupler, a first combiner and a second combiner, wherein a signal achieves an inter-frequency power division characteristic after passing through the first coupler and the second coupler; and the bandwidths of the first master amplification circuit and the second master amplification circuit are less than the bandwidths of the first slave amplification circuit and the second slave amplification circuit. The design difficulty is reduced by means of the narrow banding of master amplification circuits. By means of the design of combiners, constant impedance of two master amplification circuits is realized, such that the main amplification circuits are designed relatively independently and are easily replaced with other efficient architectures, so as to achieve a larger back-off amount. The present embodiment can facilitate the design of power amplifiers of large bandwidth, large back-off amount and high efficiency.

The invention belongs to the technical field of millimeter wave integrated circuits, and particularly discloses a constant-impedance bidirectional variable gain amplifier and a phase shifter. The invention discloses a constant-impedance bidirectional variable gain amplifier which comprises a forward differential amplification module, a reverse differential amplification module, a first transistor array, a second transistor array, a third transistor array and a fourth transistor array. The two output ends of the forward differential amplification module are connected with the two input ends of the reverse differential amplification module through the second transistor array, the fourth transistor array, the first transistor array and the third transistor array respectively. Besides two constant-impedance bidirectional variable gain amplifiers, the phase shifter disclosed by the invention also comprises an orthogonal signal generator, a first balun, a second balun, a third balun and a vector synthesizer. By controlling the grid voltage of each transistor on the amplifier, the input and output impedance of the amplifier is ensured to be in a constant state while the bidirectional work of the amplifier is realized, so that the high precision and low insertion loss of the phase shifter are realized. The invention can be widely applied to the millimeter wave active phased array.

The constant-impedance tolerance inter-board radio frequency connector and the multi-port inter-board connector comprise a first connecting assembly and a second connecting assembly which are matched with each other, and the second connecting assembly comprises a fixing unit connected with a PCB and a switching unit matched with the first connecting assembly. The adapter inner conductor of the adapter unit has a uniform outer diameter and extends out of the adapter outer conductor, and the first outer conductor of the first connecting assembly has a uniform inner diameter, so that the connector keeps the characteristic impedance constant in the sliding matching process of the adapter unit and the first connecting assembly; the multi-port high-tolerance high-density layout radio frequency connector has the advantages that the multi-port high-tolerance high-density layout radio frequency connector is simple in structure and low in cost, reflection during signal transmission is reduced, excellent return loss performance under high frequency can be guaranteed, a multi-port high-tolerance high-density layout radio frequency connection scheme can be realized, and the application frequency can reach 8Ghz and can be expanded to 16GHz at most.

1. Name of the Design Product: Integrated Constant Resistance Power Amplifier (EKA-D9A). 2. Use of the Design Product: For audio equipment. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective view.

A radio antenna comprises a folded monopole radiator, a high-impedance buffer amplifier, and a ground wire. The amplifier includes an input side, an output side, a two-pole filter, and a voltage regulator. The input side is electrically connected to the folded monopole radiator and maintains a constant impedance level, while the output side is electrically connected to a power source and also maintains a constant impedance level. The two-pole filter attenuates frequencies, and the voltage regulator is configured to supply the buffer amplifier with a fixed DC bias when power is received from the power source. The flexible ground wire is directly wired to the amplifier, has a metallic mounting end, and is positioned to maintain a constant impedance level across the folded monopole radiator.

Disclosed is a wireless charging receiver (100) comprising: a rectifier unit (110) comprising an access node (121, 122) configured to provide coupling with an external antenna (125); and a power path control unit (120) comprising: a third access node (123) configured to provide power to a connected device (30); and a fourth access node (124) configured to provide power to an external energy storage unit (15), wherein the power path control unit (120) is configured to provide a substantially constant impedance to the rectifier unit input during providing power to at least one of the connected device, connected energy storage unit (15). The energy paths to the external device and the energy storage unit may operate separately in trickle charging, and may be combined in a constant current charging mode and a constant voltage charging mode of the external energy storage unit.

The invention provides an early warning and monitoring type multi-sleeve constant-resistance anti-seismic anchor rod and a construction method. An external tensioning device, a self-locking mechanism, a constant-resistance device and an anchoring section form a complete anti-seismic early warning system. The constant-resistance device is of a multi-stage energy dissipation structure and comprises an expansion sleeve, an extrusion pipe is arranged in the expansion sleeve, and an anchor rod is arranged in the extrusion pipe. The outer end part of the expansion sleeve is locked through a self-locking mechanism; the outer end of the expansion sleeve is fixedly connected with a connecting component of an external tensioning device; the outer end of the anchor rod is fixedly connected with the cone-shaped body of the self-locking mechanism, and the inner end of the anchor rod is connected with an anchoring section used for anchoring. The tail part of the conical body is connected with a displacement monitoring system. By adopting the multi-sleeve constant-resistance anchoring device and through innovative structural design, continuous energy consumption can be achieved under dynamic loads, stable anchoring force can be kept, and meanwhile an integrated sensing system monitors displacement of an anchor rod in real time.

The invention discloses a ground fault direction protection method based on inverter distributed power supply constant impedance angle control in a power distribution network. The method comprises the following steps of: arranging a power distribution switch with functions of detecting output voltage and current components and calculating output equivalent impedance angle capacity at a grid-connected part of each IIDG (Independent Discovery Distribution Generator); after the grounding fault in the area occurs, voltage and current vectors output by any fault phase are collected at the grid connection point; under the constraint that a fault phase voltage leading current angle is a maximum sensitive angle of a directional element and low voltage ride through, reference quantities of a d axis and a q axis controlled by positive sequence current under a rotating coordinate are calculated in a control module by using a calculation formula obtained by theoretical analysis; and the reference quantity controls the equivalent impedance angle output by the IIDG at the fault phase to be the maximum sensitive angle of the directional element. Therefore, the IIDG is controlled to be a constant equivalent impedance angle during a fault, and the reliability of direction protection is further improved. Therefore, the internal fault can be accurately removed by the directional element. According to the invention, the working area of the direction element does not need to be re-formulated, so that the protection performance of the direction relay is effectively improved; the control target can be realized under different voltage drop degrees, and the control strategy meets the requirement of low voltage ride through.

An optical modulator includes an optical waveguide device including an optical waveguide and a signal electrode for controlling a light wave propagating through the optical waveguide, a drive circuit that outputs two high-frequency signals, and two termination resistors for respectively terminating the two high-frequency signals, in which one high-frequency signal among the high-frequency signals output from the drive circuit propagates through the signal electrode of the optical waveguide device and is terminated by a first termination resistor that is one of the termination resistors, an other high-frequency signal among the high-frequency signals output from the drive circuit is terminated by a second termination resistor that is an other one of the termination resistors, a resistance value of the first termination resistor is lower than a resistance value of the second termination resistor, and the signal electrode includes a plurality of sections having constant impedances different from each other.

This invention relates to a constant impedance control system and method for a rectangular six-electrode AC electric furnace, belonging to the field of electrometallurgical equipment technology. It uses an optimized short-grid system to set initial impedance values ​​under different operating conditions. Current and voltage detection units are installed at the low-voltage output terminals of each electrode to detect the current and voltage data of the electric arc. A constant impedance PID controller compares the calculated actual impedance value with the set impedance value, thereby adjusting the electrode via an electrode regulator to maintain impedance stability. Three-phase power imbalance is used as the judgment criterion. Based on a novel rectangular six-electrode electric furnace, this invention provides a precise constant impedance electrode adjustment method for this type of furnace, solving the problems of slow electrode control response, adjustment lag, and neglect of strong three-phase coupling in existing technologies, significantly improving the furnace's operational stability and energy efficiency.

The application discloses a new energy applicable grounding distance protection setting method, system, medium and product, belongs to the grounding protection setting field, and the method is: constructing equivalent models of a plurality of new energies accessed to a target power grid respectively: in a positive sequence network, equivalent to a constant current source, in a negative sequence network, equivalent to a circuit breaker, a constant current source or a constant impedance according to a control strategy, and in a zero sequence network, equivalent to a circuit breaker; a synchronous power source is equivalent to a voltage source branch with a grounding impedance in the positive sequence network, a constant impedance in the negative sequence, and a circuit breaker in the zero sequence. Combining line parameters to construct each sequence power grid system model and generate a node impedance matrix, extracting three types of parameters according to to-be-set protections, cooperating protections, fault points and new energy access positions, and calculating positive, negative and zero sequence auxiliary increase coefficients under each fault type, the minimum value is taken to calculate a grounding distance protection setting value. Through implementation of the application, the problem that the applicability of the grounding distance protection setting value after the new energy is accessed in the prior art is not clear can be solved.

The invention discloses a reconfigurable double-frequency variable gain amplifier and a transmitter thereof. The reconfigurable double-frequency variable gain amplifier comprises an input stage matching circuit, an input common-source amplification circuit, a first phase compensation circuit, a common-gate cross interconnection transistor array, a frequency band reconstruction circuit, an output common-source amplification circuit, a second phase compensation circuit and an output stage matching circuit which are connected in sequence, the input-stage matching circuit is connected with a signal input end, the output-stage matching circuit is connected with a signal output end, the common-gate cross-connected transistor array realizes the change of a gain state through a gain control signal, the number of turned-on and turned-off transistors is the same through a cross-connected structure, and the constant impedance is realized; the first phase compensation circuit and the second phase compensation circuit change the phases of the circuits through a phase control signal, the required millimeter wave frequency band can be covered in a frequency band switching mode, and wide gain change range, high linearity and low phase change are realized in the frequency band.

An electronic device may include wireless circuitry. The wireless circuitry may include at least a digital predistortion circuit, an upconversion circuit, and a load-line modulated amplifier circuit. The digital predistortion circuit can be configured to receive a reference baseband signal from one or more processors and to selectively output a predistorted version of the reference baseband signal. The upconversion circuit can be configured to receive a signal from the digital predistortion circuit and to output a radio-frequency signal. The load-line modulated amplifier circuit can be configured to amplify the radio-frequency signal. The load-line modulated amplifier circuit can include an adjustable load component. The adjustable load component can have a constant impedance when an instantaneous signal amplitude of the reference baseband signal is within a first range and can be tuned to have a varying impedance when the instantaneous signal amplitude of the reference baseband signal is within a second range.