31results about "Line impedence variation compensation" patented technology

Embodiments of the present disclosure provide systems and methods for implementing separate and orthogonal impedance tuning (Zcal) and feed forward equalization (FFE) operations of a segmented multiple level source-series terminated (SST) transmitter. An SST transmitter output driver comprising a plurality of parallel-connected output driver slices coupled to a data communication link and a multiple-tap FFE unit comprising at least one pre-cursor tap, main tap or post-cursor tap. The system performs impedance tuning within each of the plurality of parallel-connected output driver slices of the output driver. The system performs FFE resolution on the plurality of parallel-connected output driver slices of the output driver by assigning respective ones of the plurality of parallel-connected output driver slices to a specific FFE tap of the of the at least one pre-cursor tap, main tap or post-cursor tap of the FFE unit.

The invention discloses a millimeter wave waveguide transmission loss compensation method, which relates to the technical field of millimeter wave waveguide transmission and comprises the following steps of: monitoring multi-dimensional transmission loss in real time: acquiring electrical parameters such as signal amplitude and phase and parameters such as temperature, humidity and structural deformation to ensure data time synchronization; a loss mechanism layering analysis step: distinguishing three types of loss proportions, and determining dominant factors; a self-adaptive compensation strategy matching step: selecting an exclusive or cooperative compensation mode according to the loss type; a dynamic compensation parameter optimization step: adapting a signal frequency to adjust device parameters; a real-time feedback and fine tuning step: comparing signal quality dynamic correction parameters; and a closed-loop iterative optimization step: constructing a mapping model for iterative updating to form a whole-process closed loop. According to the invention, accurate and efficient compensation of millimeter wave waveguide transmission loss is realized, and signal transmission stability and environment adaptability are improved; the system has quick response and long-term operation reliability, and provides support for large-scale application of the millimeter wave technology.

The invention relates to the technical field of wireless communication, and provides a differential matching structure which comprises a first metal layer, a second metal layer, a third metal layer and a capacitor, a first coupling coil is integrated on the second metal layer, a second coupling coil and a third coupling coil are respectively integrated on the first metal layer, and the second coupling coil and the third coupling coil are positioned on the same side of the first metal layer; the third metal layer is used for grounding; the first end of the first coupling coil is used for accessing a radio frequency signal, the second end of the first coupling coil is grounded after being connected with a capacitor in series, the first end of the second coupling coil and the first end of the third coupling coil are connected and jointly connected to the third metal layer, and the second end of the second coupling coil is used for outputting the radio frequency signal; the second end of the third coupling coil is used for outputting a radio frequency signal; the first coupling coil is coupled with the second coupling coil and the third coupling coil. According to the invention, the return loss is small, and the broadband matching effect is good.

The invention discloses an underwater acoustic communication Doppler compensation method based on kinematics constraint and time-varying resampling, and belongs to the technical field of underwater acoustic communication. The method comprises the following steps: firstly, performing discrete Doppler rough estimation on a received signal; denoising, kinematics constraint abnormal value correction and smoothing processing are carried out on the sequence through cascade filtering; then, a continuous speed curve is constructed by utilizing partition mixed interpolation, and oscillation is suppressed by adopting nearest neighbor interpolation in an edge region; and finally, performing iterative judgment based on the residual index, and establishing a nonlinear mapping relation through full-time-domain integration to perform time-varying resampling on the signal. According to the method, the problem of synchronization failure caused by correlation peak divergence and interpolation boundary oscillation under non-uniform motion is solved, sampling point level waveform recovery under a high dynamic scene is realized, and the robustness and synchronization stability of the system are improved. The method is suitable for the communication field of an underwater mobile platform represented by an unmanned underwater vehicle and a subsurface buoy in a complex marine environment.

According to one embodiment, a power amplifier includes a plurality of switches and an output tank network. One or more of the switches are configured to generate one or more first intermediate waveforms having one or more first fundamental frequency components, and one or more of the switches are configured to generate one or more second intermediate waveforms by chopping the one or more first intermediate waveforms with controllable timing. The second intermediate waveforms have one or more second fundamental frequency components that are controllably reduced from those of the one or more first intermediate waveforms. The output tank network is configured to filter the one or more second intermediate waveforms to provide an output waveform to a load, the output waveform having one or more third fundamental frequency components. In some cases, all switches achieve zero voltage switching under different power and load conditions with resistive and reactive loads.

The invention relates to the technical field of communication, and discloses a low-error vector amplitude radio frequency front end, which comprises an antenna switch, and an FDD signal filter, a TDD signal filter, a phase compensation load, a first antenna and a second antenna which are respectively connected with the antenna switch, a receiving channel and a transmitting channel of the TDD signal are dynamically switched; when the TDD signal receiving channel is switched to, disconnecting the phase compensation load from the FDD signal channel; when the TDD signal transmission channel is switched to, the phase compensation load is connected to the FDD signal channel, and the impedance characteristic of the TDD signal filter in the frequency band of the FDD signal is simulated, so that the load driven by the FDD signal channel is consistent with the load phase when the TDD signal is in a receiving state, and the error vector amplitude of transmitting the FDD signal is reduced. According to the invention, a low error vector amplitude can be maintained in an ENDC scene, and the communication quality in the scene is improved.

The invention discloses a pre-demodulation circuit and a signal receiving end, and relates to the technical field of communication. The pre-demodulation circuit comprises at least one control unit, at least one amplification coefficient adjusting unit, a first impedance unit, a second impedance unit and an amplification unit, the input ends of the amplification coefficient adjusting units and the input ends of the control units are connected with a differential signal input end, the output end of each amplification coefficient adjusting unit is connected with the positive input end or the negative input end of the amplification unit, and the output end of each control unit is connected with the control end of one amplification coefficient adjusting unit. The control unit is used for controlling the equivalent impedance of the amplification coefficient adjusting unit according to a differential signal provided by the differential signal input end; the first impedance unit is connected between the negative input end and the output end of the amplification unit, the input end of the second impedance unit is used for inputting direct-current voltage, and the output end of the second impedance unit is connected with the positive input end of the amplification unit. The signal-to-noise ratio of the baseband signal is increased, and the accuracy of signal transmission is improved.

The present invention discloses a pre-demodulation circuit and a signal receiving end, relating to the field of communication technologies. The pre-demodulation circuit includes at least one control unit, at least one amplification factor adjustment unit, a first impedance unit, a second impedance unit, and an amplification unit; the input end of the amplification factor adjustment unit and the input end of the control unit are connected to a differential signal input end, the output end of each amplification factor adjustment unit is connected to the positive input end or the negative input end of the amplification unit, the output end of each control unit is connected to the control end of an amplification factor adjustment unit, and the control unit is used to control the equivalent impedance of the amplification factor adjustment unit according to the differential signal provided by the differential signal input end; the first impedance unit is connected between the negative input end and the output end of the amplification unit, the input end of the second impedance unit is used to input a DC voltage, and the output end of the second impedance unit is connected to the positive input end of the amplification unit. The signal-to-noise ratio of the baseband signal is increased, and the accuracy of signal transmission is improved.

A transmission circuit is used for performing transmission with a reception circuit through a positive terminal channel and a negative terminal channel. The transmission circuit includes an output stage circuit, comprising a variable output impedance circuit, coupled to the positive terminal channel and the negative terminal channel; and a driving circuit, comprising a positive output terminal and a negative output terminal, configured to output a second data signal through the variable output impedance circuit according to a first data signal, wherein the positive output terminal and the negative output terminal drive the positive terminal channel and the negative terminal channel respectively through the variable output impedance circuit; and a transition detection circuit, coupled to the output stage circuit, configured to detect whether the first data signal transitions according to a clock signal having a time period, and generate a detection result to adjust the variable output impedance circuit.

This invention discloses a dynamic adaptive adjustment method, apparatus, device, and medium for terminating resistance, belonging to the field of industrial fieldbus communication technology. The method includes: determining whether the current node is a physical end of the bus; if not, disconnecting the terminating match; if it is, injecting a calibration pulse with a preset rising edge into the bus; acquiring the reflected signal generated by the calibration pulse on the bus, and recording waveform characteristic parameters including at least overshoot amplitude and ringing duration; iteratively adjusting the terminating resistance value using a variable step-size strategy based on the waveform characteristic parameters; increasing the resistance value when the overshoot amplitude exceeds a preset amplitude threshold, and decreasing the resistance value when the ringing duration exceeds a preset time threshold, until the matching completion condition is met; and locking the optimal terminating resistance configuration to the matching resistance value in the current communication mode. This invention achieves automatic identification of end nodes and closed-loop adaptive adjustment of the terminating resistance, significantly improving the signal integrity and reliability of bus communication.

In some examples, a circuit includes a first transistor (312), a second transistor (314), a first resistor (318), and a digital logic circuit (106). The first transistor has a control terminal and first and second terminals. The second transistor has a control terminal and first and second terminals, the first terminal of the second transistor coupled to the second terminal of the first transistor. The first resistor has first and second terminals, the first terminal of the first resistor coupled to the control terminal of the second transistor, and the second terminal of the first resistor coupled to the first terminal of the second transistor. The digital logic circuit has an output terminal and first and second input terminals, the output terminal of the digital logic circuit coupled to the control terminal of the second transistor, the first input terminal of the digital logic circuit coupled to a data transmit input terminal (TXD) of the circuit, and the second input terminal of the digital logic circuit coupled to a data receive output terminal (RXD) of the circuit.

A system for filter enhancement, preferably including one or more analog taps and a controller, and optionally including one or more couplers. The system is preferably configured to integrate with a filter, such as a passband filter or other frequency-based filter. The system can be configured to integrate with an RF communication system, an RF front end, or any other suitable RF circuitry. A method for filter enhancement, preferably including configuring one or more analog taps, and optionally including calibrating a system for filter enhancement and / or receiving temperature information.

The application discloses a kind of millimeter wave waveguide transmission loss compensation methods, it is related to millimeter wave waveguide transmission technical field, including multidimensional transmission loss real-time monitoring step, collection signal amplitude, phase and other electrical parameters and temperature, humidity, structural deformation and other parameters, ensure data time synchronization;Loss mechanism hierarchical analysis step, distinguish three kinds of loss proportion, clear dominant factor;Self-adapting compensation strategy matching step, according to loss type select exclusive or collaborative compensation mode;Dynamic compensation parameter optimization step, adapt signal frequency adjustment device parameter;Real-time feedback and fine adjustment step, compare signal quality dynamic correction parameter;Closed-loop iterative optimization step, construct mapping model iterative update, form whole-process closed loop.The application realizes the accurate and efficient compensation of millimeter wave waveguide transmission loss, improves signal transmission stability and environmental adaptability;With fast response and long-term operation reliability, provide support for millimeter wave technology scale application.

The invention provides an on-line diagnosis method, device and equipment for an automobile audio bus and a medium, the method is applied to a host, and the method comprises the following steps: generating a digital chaotic sequence different from a transmission signal in the automobile audio bus; injecting a digital chaos sequence into the bus to send the digital chaos sequence to a target child node in an idle time slot when the bus periodically transmits the transmission signal; receiving a response signal returned by the analog switch through the automobile audio bus; taking the response signal as a target chaotic sequence, and performing comparative analysis on the target chaotic sequence and the digital chaotic sequence; and determining whether the impedance mismatching problem exists on the communication path from the host to the child node and the analog switch based on the comparison analysis result. By means of the method, the technical problem that in the prior art, on the premise that normal communication of the bus is not interrupted, real-time, intelligent and automatic diagnosis and positioning cannot be conducted on the bus impedance state can be solved.

The application relates to the field of communication technology and discloses a radio frequency front end with low error vector magnitude, which comprises an antenna switch, an FDD signal filter, a TDD signal filter, a phase compensation load, a first antenna and a second antenna connected with the antenna switch respectively, and is used for keeping the FDD signal receiving and transmitting path connected and dynamically switching the receiving path and the transmitting path of the TDD signal in a dual connection scene; when the TDD signal receiving path is switched, the phase compensation load is disconnected with the FDD signal path; when the TDD signal transmitting path is switched, the phase compensation load is connected with the FDD signal path, the impedance characteristics of the TDD signal filter in the FDD signal frequency band are simulated, the load phase of the load driven by the FDD signal path is consistent with the load phase when the TDD signal is in the receiving state, and the error vector magnitude of the transmitted FDD signal is reduced. The application can keep a low error vector magnitude in the ENDC scene and improve the communication quality in the scene.

An integrated circuit (IC) chip is disclosed. The IC chip includes receiver circuitry having an input pin, a first input circuit coupled to the input pin, and a T-coil compensation circuit to compensate for a first parasitic capacitance associated with the first input circuit. An on-die termination (ODT) circuit is included that is separate from the first input circuit. A circuit including a resistor and an inductor is coupled in series between the T-coil compensation circuit and the ODT circuit. The circuit compensates for a second parasitic capacitance associated with the ODT circuit.

The invention discloses an adjusting method and system for compensating a temperature-variable impedance drift signal, and relates to the technical field of signal transmission, the adjusting system applied to the temperature-variable impedance drift signal comprises a transmitter, a receiver and a reference impedance wire, the transmitter and the receiver are connected through at least one signal wire, and the reference impedance wire is connected with the transmitter. The impedance of the reference impedance wire is the same as that of the signal wire. The method comprises the following steps: acquiring the reference impedance and the current impedance of the reference impedance wire; wherein the reference impedance is an impedance value of the reference impedance wire at the reference temperature without temperature change influence; determining an impedance variation based on the reference impedance and the current impedance; determining a target equalization parameter based on the impedance variable quantity; setting equalization parameters of the transmitter and the receiver as target equalization parameters to compensate signal transmission quality degradation caused by temperature change impedance drift; according to the invention, the problem that the signal integrity cannot be adaptively optimized in the whole temperature range in the prior art is solved.

Embodiments of the present disclosure provide systems and methods for implementing separate and orthogonal impedance tuning (Zcal) and feed forward equalization (FFE) operations of a segmented multiple level source-series terminated (SST) transmitter. An SST transmitter output driver comprising a plurality of parallel-connected output driver slices coupled to a data communication link and a multiple-tap FFE unit comprising at least one pre-cursor tap, main tap or post-cursor tap. The system performs impedance tuning within each of the plurality of parallel-connected output driver slices of the output driver. The system performs FFE resolution on the plurality of parallel-connected output driver slices of the output driver by assigning respective ones of the plurality of parallel-connected output driver slices to a specific FFE tap of the of the at least one pre-cursor tap, main tap or post-cursor tap of the FFE unit.

According to one embodiment, a power amplifier includes a plurality of switches and an output slot network. One or more of the switches are configured to generate one or more first intermediate waveforms having one or more first fundamental components, and one or more of the switches are configured to generate one or more second intermediate waveforms by chopping the one or more first intermediate waveforms with controllable timing. The second intermediate waveform has one or more second fundamental components that are controllably reduced from the fundamental components of the one or more first intermediate waveforms. The output slot network is configured to filter the one or more second intermediate waveforms to provide an output waveform to the load, the output waveform having one or more third fundamental components. In some cases, all switches implement zero voltage switching under different power and load conditions with resistive and reactive loads.

The embodiment of the invention provides a transmitter, a transceiving device and a communication system. The transceiver comprises a first output end and a second output end which are suitable for being coupled to a high level signal line and a low level signal line of a controller area network bus through a common mode inductor respectively; a differential input resistor coupled between the first output terminal and the second output terminal and coupled to a common mode potential; a main transmission circuit; the compensation component comprises a current compensation loop coupled to the first output end and the second output end, and is configured as follows: when a short circuit occurs between the high-level signal line and the first reference potential or a short circuit occurs between the low-level signal line and the second reference potential, the current compensation loop is coupled to the first output end and the second output end; the inductive current flowing through the common mode inductor is conducted through the current compensation loop to bypass the differential input resistor during output of the hidden signal. According to the embodiment of the invention, the short-circuit communication of the CAN bus can be supported under the condition that the common-mode inductor is arranged.

This invention relates to the field of wireless communication technology and provides a differential matching structure. The differential matching structure includes a first metal layer, a second metal layer, and a third metal layer stacked sequentially and insulated from each other, as well as a capacitor. A first coupling coil is integrated on the second metal layer, and a second coupling coil and a third coupling coil are integrated on the first metal layer, located on the same side of the first metal layer. The third metal layer is used for grounding. A first end of the first coupling coil is used to receive a radio frequency (RF) signal, and a second end of the first coupling coil is connected to ground via a capacitor connected in series. The first ends of the second and third coupling coils are connected and jointly connected to the third metal layer. The second ends of the second and third coupling coils are used to output RF signals. The first coupling coil is coupled to both the second and third coupling coils. This invention results in low return loss and good wideband matching performance.

The application discloses a kind of for compensating the adjusting method and system of temperature variation impedance drift signal, it is related to signal transmission technical field, it is applied to the adjusting system of compensating temperature variation impedance drift signal, adjusting system includes: transmitter, receiver, reference impedance trace, transmitter and receiver are connected by at least one signal trace, reference impedance trace and the impedance of signal trace are same, method includes: obtaining reference impedance trace reference impedance and current impedance;Wherein, reference impedance is the impedance value of reference impedance trace at reference temperature without temperature variation influence;Determine impedance variation amount based on reference impedance and current impedance;Determine target equalization parameter based on impedance variation amount;Equalization parameter of transmitter and receiver is set as target equalization parameter, to compensate the signal transmission quality degradation caused by temperature variation impedance drift;The application solves the problem that related art cannot adaptively optimize signal integrity in full temperature range.

The application provides a continuous time linear equalizer and a high-speed serial communication receiver thereof, and belongs to the technical field of integrated circuits, and comprises: a plurality of differential input pairs with different input common-mode voltage ranges; an input selection circuit configured to alternatively enable one of all the differential input pairs as a target differential input pair; a differential load circuit coupled to an output end of a differential input stage module and having an adjustable equivalent impedance; and a load control circuit configured to determine load configuration information in response to an input mode selection signal and adjust the equivalent impedance of the differential load circuit according to the load configuration information. The application establishes a linkage mechanism of input stage switching and load impedance adjustment through the input mode selection signal, automatically calls corresponding calibration parameters to eliminate the offset voltage in different modes while expanding the input common-mode voltage range, and significantly improves the adaptability and signal transmission quality of the high-speed interface circuit.

The invention provides a continuous-time linear equalizer and a high-speed serial communication receiver thereof, and belongs to the technical field of integrated circuits, and the continuous-time linear equalizer comprises a plurality of differential input pairs with different input common-mode voltage ranges; the input selection circuit is configured to select one of all the differential input pairs to be used as a target differential input pair; the differential load circuit is coupled to the output end of the differential input stage module and has adjustable equivalent impedance; the load control circuit is configured to determine load configuration information in response to the input mode selection signal and adjust an equivalent impedance of the differential load circuit according to the load configuration information. According to the high-speed interface circuit, a linkage mechanism of input stage switching and load impedance adjustment is established through the input mode selection signal, corresponding calibration parameters are automatically called to eliminate offset voltages in different modes while the input common-mode voltage range is expanded, and the adaptability and the signal transmission quality of the high-speed interface circuit are remarkably improved.

A transmission circuit is used for performing transmission with a reception circuit through a positive terminal channel and a negative terminal channel. The transmission circuit includes an output stage circuit, comprising a variable output impedance circuit, coupled to the positive terminal channel and the negative terminal channel; and a driving circuit, comprising a positive output terminal and a negative output terminal, configured to output a second data signal through the variable output impedance circuit according to a first data signal, wherein the positive output terminal and the negative output terminal drive the positive terminal channel and the negative terminal channel respectively through the variable output impedance circuit; and a transition detection circuit, coupled to the output stage circuit, configured to detect whether the first data signal transitions according to a clock signal having a time period, and generate a detection result to adjust the variable output impedance circuit.

The present invention discloses a method and system for improving the transmission quality of circuit signals, which belongs to the field of signal transmission technology, and specifically includes: S1, obtaining the real-time fluctuation characteristics of the original signal on the transmission conductor, the real-time fluctuation characteristics including the fluctuation intensity distribution set and the periodic unit duration; S2, generating a reverse compensation waveform that is mirror-symmetrical to the real-time fluctuation characteristics, and the reverse compensation waveform is injected into the transmission conductor during the signal transmission process; S3, setting a dynamic tuning node on the transmission path of the transmission conductor, and the dynamic tuning node generates an impedance adjustment instruction based on the distribution of the physical characteristics of the transmission conductor; S4, synchronously correcting the phase offset of the reverse compensation waveform according to the impedance adjustment instruction, so that the injection point position of the reverse compensation waveform coincides with the impedance peak area of ​​the transmission conductor; the present invention improves the transmission quality of circuit signals in complex environments through dynamic tuning and real-time compensation mechanisms.

The present application relates to the technical field of microwave circuit, especially to a compact L-band multi-path superconducting filter receiving front-end component, which is composed of a low-pass filter, a limiter, a first radio frequency switch, a straight-through radio frequency cable, a superconducting band-pass filter group, a second radio frequency switch, a low-noise amplification circuit and a digital control attenuator, and forms the compact L-band multi-path superconducting filter receiving front-end component through the connection relationship among them, realizes the combination of normal-temperature devices and superconducting filter components, improves the power capacity of the filter, and ensures the normal work of the receiving link under the failure condition of low-temperature environment.

The invention discloses a method and system for improving circuit signal transmission quality, and belongs to the technical field of signal transmission, and the method specifically comprises the steps: S1, obtaining the real-time fluctuation characteristics of an original signal on a transmission conductor, the real-time fluctuation characteristics comprising a fluctuation intensity distribution set and a periodic unit duration; s2, generating a reverse compensation waveform which is in mirror symmetry with the real-time fluctuation characteristic, wherein the reverse compensation waveform is injected into a transmission conductor in a signal transmission process; s3, setting a dynamic tuning node on a transmission path of the transmission conductor, wherein the dynamic tuning node generates an impedance adjusting instruction according to the physical characteristic distribution of the transmission conductor; s4, the phase offset of the reverse compensation waveform is synchronously corrected according to the impedance adjusting instruction, so that the injection point position of the reverse compensation waveform coincides with the impedance peak value area of the transmission conductor; according to the invention, the transmission quality of circuit signals in a complex environment is improved through a dynamic tuning and real-time compensation mechanism.

The invention discloses a transmission circuit, a transmission method and a transmission receiving system, the transmission circuit is used for transmitting with a receiving circuit through a positive end channel and a negative end channel, and the transmission circuit comprises an output stage circuit and a transition detection circuit. The output stage circuit comprises a variable output impedance circuit which is coupled to the positive end channel and the negative end channel; and the driving circuit comprises a positive output end and a negative output end and is used for outputting a second data signal according to a first data signal through the variable output impedance circuit, and the positive output end and the negative output end respectively drive the positive end channel and the negative end channel through the variable output impedance circuit. The transition detection circuit is coupled to the output stage circuit, and is used for detecting whether the first data signal is transitioned according to a clock signal with a unit period, and generating a detection result to adjust the variable output impedance circuit.

In some examples, a circuit includes a first transistor, a second transistor, a first resistor, and a digital logic circuit. The first transistor has a control terminal and first and second terminals. The second transistor has a control terminal and first and second terminals, the first terminal of the second transistor coupled to the second terminal of the first transistor. The first resistor has first and second terminals, the first terminal of the first resistor coupled to the control terminal of the second transistor, and the second terminal of the first resistor coupled to the first terminal of the second transistor. The digital logic circuit has an output terminal and first and second input terminals, the output terminal of the digital logic circuit coupled to the control terminal of the second transistor, the first input terminal of the digital logic circuit coupled to a data transmit input terminal of the circuit, and the second input terminal of the digital logic circuit coupled to a data receive output terminal of the circuit.