138results about "Multi-frequency-changing modulation transference" patented technology

The invention relates to the technical field of wireless communication and signal processing, in particular to a short-wave spectrum efficient sampling method and system based on compressed sensing, and the method comprises the steps: collecting full-band power spectrum density data through a low-speed scanning receiver; determining a strong interference frequency point set; generating a binary null observation sequence; loading the binary null observation sequence to an analog front-end frequency mixing circuit, performing analog domain orthogonal frequency mixing and integral processing on the input radio frequency signal, and outputting a voltage sampling value; resolving to obtain a signal sparse coefficient through a compressed sensing reconstruction algorithm; calculating a reconstruction residual error according to the voltage sampling value and the signal sparse coefficient; in response to the condition that the reconstruction residual error is greater than a preset error threshold, triggering a reacquisition process of the power spectral density data; outputting a signal sparse coefficient in response to the condition that the reconstruction residual error is smaller than or equal to a preset error threshold; according to the invention, the problems of limited dynamic range and weak signal submerging are solved, and the receiving sensitivity of weak signals in a strong interference environment is obviously improved.

Circuitry is provided that includes a matching circuit, a first mixer coupled to the matching circuit and configured to receive a signal with an oscillation frequency, a second mixer coupled to the matching circuit, a first transmission line path coupled between the matching circuit and an input of the first mixer, and one or more capacitors coupled to the input of the first mixer and configured to reject signals at a harmonic frequency of the oscillation frequency. The wireless circuitry can further include a second transmission line path coupled between the matching circuit and an input of the second mixer. The transmission line path can include a first transmission line for conveying signals between the matching circuit and the first mixer, a second transmission line for conveying signals between the matching circuit and the first mixer, and a floating transmission line interposed between the first and second transmission lines.

The embodiment of the invention relates to jitter compensation calibration. According to one embodiment, a method for calibrating a local oscillator in an amplitude shift keying (ASK) demodulator of a wireless power transmitter is presented. The method includes: receiving a digital signal corresponding to a voltage or a current of a transmitter coil in a wireless power system implemented with frequency jitter; iteratively adjusting a counter value associated with a jitter table of the local oscillator; wherein for each iteration, the method comprises generating an in-phase (I) component and a quadrature (Q) component using a local oscillator, calculating a metric based on the I component and the Q component, and storing a counter value if the calculated metric exceeds a previously stored optimal metric; and configuring the local oscillator with the stored counter value associated with the optimal metric.

The invention relates to a multichannel down-conversion chip, a multichannel down-conversion circuit and a receiver, and the chip comprises a local oscillator signal processing module which accesses a local oscillator signal, carries out the amplification and power division of the local oscillator signal, and obtains a plurality of local oscillator power division signals; based on the local oscillator power division signal, phase shifting is carried out to obtain a phase-shifted local oscillator signal, and the phase-shifted local oscillator signal is input of a frequency mixer in a corresponding channel; each channel of the multi-channel module is provided with a radio frequency amplifier, a frequency mixer and an intermediate frequency amplifier which are connected in sequence, the input end of each radio frequency amplifier is used for accessing a received radio frequency signal, and the output end of each intermediate frequency amplifier is the output end of the corresponding channel; by adopting the chip, the number of components required in the down-conversion circuit can be effectively reduced, the manufacturing cost of the down-conversion circuit is reduced, and the plurality of components such as the radio frequency amplifier, the frequency mixer and the intermediate frequency amplifier are integrated in the same chip, so that the size of the down-conversion circuit can be reduced, and the miniaturization requirement can be met.

Architectures are presented for transmitters and receivers that use a harmonic rejection mixer that uses a 6-phase clock signal, while also using a differential in-phase / quadrature input signal (for the transmitter) or output signal (for the receiver). This results in crosstalk between the in-phase and quadrature components, where a digital correction circuit forms a linear combination of the baseband I / Q signals to generate the I / Q for the mixer in order to obtain the desired baseband signal. By using a differential I / Q signal, only two DACs / ADCs are needed, saving circuitry area and power consumption, while providing strong 2nd, 3rd, and 4th clock harmonic rejection. The clock signal can be composed of two sets of 3-phase signals, each signal having a 33% duty cycle.

The embodiment of the invention provides a frequency multiplication amplification circuit applied to a phase-locked loop and communication equipment, and the frequency multiplication amplification circuit applied to the phase-locked loop comprises a local oscillator frequency division module which is electrically connected with the output end of the phase-locked loop and is used for receiving a radio frequency signal output by the phase-locked loop and outputting a local oscillator signal according to the radio frequency signal; the frequency mixing module is electrically connected with the output end of the phase-locked loop and the output end of the local oscillator frequency division module, and is used for synthesizing a frequency mixing signal according to the radio frequency signal and the local oscillator signal; wherein the frequency of the frequency mixing signal is greater than that of the radio frequency signal. According to the technical scheme, the frequency multiplication amplification circuit is arranged outside the phase-locked loop, the frequency of the output signal of the phase-locked loop can be amplified, the output frequency of the phase-locked loop can be expanded without changing a core circuit in the phase-locked loop, and the frequency multiplication amplification circuit applied to the phase-locked loop is simple in structure.

A semiconductor device comprising at least one transmit path is provided. The transmit path comprises an input node for receiving a digital baseband signal. Further, the transmit path comprises digital mixer circuitry coupled to the input node and configured to generate an upconverted digital baseband signal by upconverting a frequency of the digital baseband signal. Additionally, the transmit path comprises Digital-to-Analog Converter (DAC) circuitry coupled to the digital mixer circuitry and configured to generate an analog radio frequency signal based on the upconverted digital baseband signal. The transmit path comprises first analog mixer circuitry coupleable to an output of the DAC circuitry, and second analog mixer circuitry coupleable to the output of the DAC circuitry. Further, the transmit path comprises a first output node coupleable to an output of the first analog mixer circuitry, and a second output node coupleable to an output of the second analog mixer circuitry.

Certain aspects provide a circuit for frequency translation. The circuit includes first mixer circuitry coupled to a load circuit and having a first mixer configured to generate, based on a first differential input signal and a second differential input signal, a first portion of a frequency translated differential signal to be provided to the load circuit, and a second mixer configured to generate, based on a third differential input signal and a fourth differential input signal, a second portion of the frequency translated differential signal. The circuit also includes second mixer circuitry coupled to another load circuit and having a third mixer configured to generate, based on the first differential input signal and the fourth differential input signal, a first portion of another frequency translated differential signal, and a fourth mixer configured to generate, based on the third differential input signal and the second differential input signal, a second portion of the another frequency translated differential signal.

The invention discloses a high-precision digital double-mixing phase discriminator, and belongs to the technical field of time transfer. Comprising a sampling amplification module, the output end of the sampling amplification module is connected with a signal processing module, and the output end of the signal processing module is connected with a result output module; the sampling and amplifying module is used for receiving two paths of input clock signals fCLKA and fCLKB, and sampling and amplifying the fCLKA and fCLKB by cascading two paths of multi-stage D triggers, so that the phase difference of the two paths of input clock signals is reserved and amplified, and the probability of metastable state occurrence is reduced; the signal processing module is used for carrying out jitter optimization processing on the two paths of sampled and amplified signals and extracting stable signal edges; and the result output module is used for measuring the amplified phase difference according to the two paths of signals subjected to jitter optimization, and obtaining the original phase difference through scaling down. Digital amplification is adopted, analog devices are not needed, noise introduction and delay uncertainty are avoided, and therefore the linearity and reliability of measurement are improved.

This disclosure provides systems, methods, and devices for wireless communication that support reconfiguring degeneration components in a converged RF transceiver supporting carrier aggregation across sub-6 GHz frequency bands and mmWave frequency bands. In a first aspect, an apparatus includes an input port configured to receive a mixer input signal; a first mixer forming at least a portion of an HRM mixer and coupled to the input port; a first configurable degeneration component of a first processing path coupled between the input port and the first mixer; and a controller coupled to the first degeneration component, wherein the controller is configured to control a first aspect of a first degeneration component. Other aspects and features are also claimed and described.

The application discloses a terahertz mixer, comprising: a radio frequency input waveguide, a local oscillator input waveguide, a local oscillator filter and an intermediate frequency output waveguide, wherein the intermediate frequency output waveguide comprises a built-in fin line transition structure and a Schottky diode pair; one end of the fin line transition structure is connected with the radio frequency input waveguide, the other end of the fin line transition structure is connected with the local oscillator filter, the Schottky diode pair is connected with one side of the fin line transition structure and connected with an intermediate frequency output port of the intermediate frequency output waveguide; after the local oscillator signal is filtered by the local oscillator filter, the local oscillator signal is transmitted to the fin line transition structure, the radio frequency signal and the local oscillator signal are loaded into the Schottky diode pair through the fin line transition structure for frequency mixing, and the intermediate frequency signal is output through the intermediate frequency output port. In this case, the fin line transition structure simultaneously carries the radio frequency signal and the local oscillator signal, which can realize spatial superposition and power efficient injection of the signals, and has good impedance matching characteristics.

The invention provides a W-band sixteen-channel chip circuit model, and relates to the technical field of radio frequency integrated microsystems. The model comprises an up-conversion frequency mixing circuit, a down-conversion frequency mixing circuit and sixteen channel circuits connected in parallel, and each channel circuit comprises two branch circuits connected in parallel. Wherein one branch is sequentially connected in series with a low-noise amplification circuit, a first six-bit numerical control phase shift circuit, a first driving amplification circuit, a five-bit numerical control attenuation circuit and a second driving amplification circuit, and the other branch is sequentially connected in series with a first power amplification circuit, a second six-bit numerical control phase shift circuit and a second power amplification circuit. The sixteen channel circuits are all connected to an input port of the radio frequency switch circuit S. The up-conversion frequency mixing circuit and the down-conversion frequency mixing circuit are respectively connected with two output ends of the radio frequency switch circuit S. According to the method, the design speed of a complex circuit or system can be increased, and a priori condition is provided for research of a large-scale complex network.

The application discloses a kind of very small step local oscillator devices, comprising: reference signal source;DDS synthesizer is used to receive the output signal of reference signal source, and output the first output signal of lower frequency;First filter is used to filter the first output signal, and obtain the first to-be-mixed signal;Frequency multiplier is used to receive the output signal of reference signal source, and output the second output signal of higher frequency;Second filter is used to filter the second output signal, and obtain the second to-be-mixed signal;Mixing frequency ware is used to mix the first to-be-mixed signal and the second to-be-mixed signal, and obtain mixed signal;Third filter is used to filter mixed signal, and obtain phase-locked loop reference signal;Phase-locked loop module is used to receive phase-locked loop reference signal, and output local oscillator signal.It also discloses a kind of very small step local oscillator method.The application is while realizing very small step local oscillator scheme, also has very low decimal step spur.

The present application relates to a method and system for improving the broadband active mixer reversible design method of reversible neural network, the method comprises: obtaining the response of the broadband active mixer, wherein the response comprises the conversion gain G and the noise figure NF; inputting the response into the R-INN model, and outputting the design parameters of the broadband active mixer, wherein the design parameters comprise resistance and capacitance, the R-INN model is constructed by combining real non-volume preserving transformation with reversible neural network, the R-INN model is obtained by training the training set, and the training set comprises the design parameters in the preset range and the corresponding response. By introducing an improved reversible neural network model combined with real non-volume preserving transformation technology, the accuracy of forward prediction is optimized, and the posterior distribution of the design parameters is effectively back calculated, thereby improving the efficiency and accuracy of the optimization design of the broadband active mixer.

The present disclosure relates to a subharmonic mixer including first and second radio frequency (RF) inputs, local oscillator inputs configured and arranged to receive at least a first, second, third, and fourth local oscillator signals having respective first, second, third, and fourth phases and each having a first frequency, first, second, third, and fourth outputs, a first capacitor coupled between the first RF input and a first node, a first switch coupled between the first node and the second RF input and including a first control terminal to receive the first local oscillator signal, a second switch coupled between the first node and the first output and including a second control terminal to receive the fourth local oscillator signal, and a third switch coupled between the first node and the third output and including a third control terminal to receive the second local oscillator signal.

Circuitry (24) is provided that includes a matching circuit (100), a first mixer (50-1) coupled to the matching circuit and configured to receive a signal with an oscillation frequency, a second mixer (50-2) coupled to the matching circuit, a first transmission line path (102-1) coupled between the matching circuit (100) and an input of the first mixer (50-1), and one or more capacitors (104) coupled to the input of the first mixer (50-1) and configured to reject signals at a harmonic frequency of the oscillation frequency. The wireless circuitry (24) can further include a second transmission line path (102-2) coupled between the matching circuit (100) and an input of the second mixer (50-2). The transmission line path can include a first transmission line for conveying signals between the matching circuit (100) and the first mixer (50-1), a second transmission line for conveying signals between the matching circuit (100) and the first mixer (50-1), and a floating transmission line interposed between the first and second transmission lines.

The invention relates to the field of integrated circuits, and discloses a low-phase noise signal source circuit and radar equipment, and the low-phase noise signal source circuit comprises a four-core F23 type voltage-controlled oscillator which is used for generating a fundamental frequency, a second harmonic and a third harmonic; the harmonic self-mixer is connected with the quad-core F23 type voltage-controlled oscillator, and is used for mixing the fundamental frequency and the third harmonic into a quadruplicated frequency signal and outputting the quadruplicated frequency signal, and mixing the fundamental frequency and the fundamental frequency into a secondary frequency multiplication signal and outputting the secondary frequency multiplication signal; and the amplifier is connected with the harmonic self-mixer and is used for amplifying the quadruplicated frequency signal and outputting the amplified quadruplicated frequency signal. The signal source circuit can generate quadruplicated frequency signals.

The utility model provides a miniaturized unified Ka frequency band up-conversion channel convenient to disassemble, which comprises a packaged structural member, an upper cover plate, and a radio frequency module, a frequency conversion module, an intermediate frequency module and a Ka frequency band filter which are connected in the structural member, and the structural member is provided with a unified area and a filter area. According to the utility model, the broadband harmonic mixing chip, the numerical control attenuator chip and the amplifier chip which can cover all Ka frequency bands are selected, the Ka up-conversion module is divided into a filter area and a unified area, variables caused by all customized up-conversion channels are concentrated in the filter area, and the filters are replaced by being connected with the unified area through the gold wires, so that the replacement efficiency is improved. The model selection of each chip, the design of a printed board, the position of an external interface and the like of a unified region are not influenced; the radio frequency interface, the intermediate frequency interface and the local oscillator interface are SMP interfaces, outlets of the low-frequency connector and the intermediate-frequency SMP connector face downwards, and SMP-KK can be directly used for direct insertion during follow-up assembly and test, so that assembly and test are facilitated.

The embodiment of the application provides a kind of passive mixer and antenna.Belongs to communication technical field.The passive mixer includes: multi-branch microstrip line balun, mixing diode and output balun module;The first input end of multi-branch microstrip balun is the first input end of passive mixer, the second input end of multi-branch microstrip line balun is the second input end of passive mixer, the first output end of multi-branch microstrip line balun is connected with the first input end of mixing diode, the second output end of multi-branch microstrip line balun is connected with the second input end of mixing diode, the first output end of mixing diode is connected with the first input end of output balun module, the second output end of mixing diode is connected with the second input end of output balun module, and the output end of output balun module is the output end of passive mixer.The method solves the problem of high cost of active mixer transformation and poor output signal quality of passive mixer.

This invention discloses a broadband frequency-shifting conformal transmission method for electromagnetic waves based on a time-varying circuit with dual constitutive parameters, belonging to the fields of microwave radio frequency, time metamaterials, and frequency domain transformation technology. The method is implemented using a frequency-shifting transmission circuit, which includes a microstrip transmission line and a periodically loaded inductor branch. The inductor branch includes switches, series inductors, and parallel inductors. When all switches in the frequency-shifting transmission circuit are open, an input pulse signal is sent to the circuit. When the pulse signal has fully entered the microstrip transmission line, all switches close simultaneously. Due to the wavenumber conservation of the microstrip transmission line, frequency shift occurs, achieving frequency-shifting transmission. This method does not rely on a complex local oscillator system, does not increase circuit complexity excessively, and theoretically does not generate harmonics. It achieves broadband frequency shifting, reflection-free, high-efficiency transmission, and waveform distortion-free conformal transmission, providing a new technical path for broadband, low-distortion signal processing in the microwave radio frequency field.

The utility model discloses a broadband anti-interference down-conversion device and a radio frequency receiving system, and relates to the wireless communication technology. The device comprises a first frequency converter, a second frequency converter, a power divider and a local oscillator unit. Wherein the first frequency converter and the second frequency converter realize two-stage frequency conversion of radio frequency signals, the second frequency converter adopts a dual-channel ping-pong switching structure, and two channels are connected with the output end of the first frequency converter through the power divider; the local oscillation unit provides independent local oscillation signal input for the first frequency converter, the second frequency converter and the local oscillation unit. According to the utility model, the broadband and high-dynamic interference suppression performance is realized through the combination of two-stage frequency conversion and a dual-channel ping-pong switching structure.

The present disclosure relates to a kind of digital circuit and communication device, and it relates to communication technical field.The digital circuit includes first signal processing module, with baseband processing module connection, is configured to the input signal of first signal processing module carries out first sampling rate conversion and first frequency shift;Second signal processing module includes multiple sub-modules in cascade, multiple sub-modules include first sub-module and second sub-module, first sub-module is connected with first signal processing module, and is located in one end of multiple sub-modules, second sub-module is connected with data converter, and is located in the other end of multiple sub-modules, each sub-module in multiple sub-modules is configured to the input signal of sub-module carries out second sampling rate conversion and second frequency shift;Frequency shift configuration module is connected with each sub-module in first signal processing module and second signal processing module, is configured to set the frequency shift amount of each sub-module in first signal processing module and second signal processing module for frequency shift.

The application relates to a Schottky diode-based terahertz frequency conversion component and belongs to the technical field of terahertz communication, wherein the frequency conversion component comprises a local oscillator frequency multiplication link, a terahertz subharmonic mixer and a waveguide filter which are electrically connected in sequence, and the terahertz subharmonic mixer is also electrically connected with an intermediate frequency filter. The Schottky diode is used to manufacture a Q-band tripler, the manufacturing cost is extremely low, the design difficulty of the local oscillator link is reduced, the local oscillator frequency demand is reduced by the harmonic mixer, the testability of the local oscillator link is improved, and the troubleshooting cost and time are reduced.

The invention discloses a three-stage frequency conversion electron cyclotron radiation diagnosis system capable of adjusting a diagnosis space overlapping degree, and relates to the technical field of nuclear fusion plasma diagnosis. The system comprises an antenna used for receiving an electron cyclotron radiation signal of plasma; the primary mixer is used for generating a first intermediate frequency signal; the first-stage power divider is used for distributing the first intermediate frequency signal to a plurality of first parallel independent channels; a plurality of secondary mixers for generating a second intermediate frequency signal; the plurality of second-stage power dividers are used for distributing second intermediate frequency signals output by each second-stage frequency mixer in the plurality of second-stage frequency mixers to a plurality of second parallel independent channels; the plurality of third-stage frequency mixers are used for generating third intermediate frequency signals; and the plurality of detectors are used for converting the third intermediate-frequency signal into a direct-current voltage signal. According to the invention, the visual field overlapping degree of the diagnosis space is dynamically controlled, and the adaptability and practicability of the diagnosis system are improved.

This invention discloses a radio frequency (RF) link for improving the dynamic range of signal reception in complex electromagnetic environments, comprising: an RF link circuit, a mixer link circuit, and an intermediate frequency (IF) gain circuit, which are connected sequentially; it also includes a detection and control circuit, which is disposed between the mixer link circuit and the IF gain circuit, for judging and calculating the voltage value of the detected signal, and thereby controlling the IF link gain and the magnitude of the mixer input signal. This invention effectively solves the problems of link saturation caused by strong interference signals and the decrease in effective dynamic range caused by mismatch between the input range of the ADC acquisition link and the link.

The invention relates to a 5GNTN low earth orbit satellite frequency conversion device for realizing broadband coverage, which comprises a reference clock unit, a frequency conversion unit, a local oscillation leakage suppression unit, a gain selection control unit and a frequency synthesis control unit, and is characterized in that the output end of the reference clock unit is connected with the input end of the frequency conversion unit; the output end of the frequency conversion unit is connected with the input end of the local oscillation leakage suppression unit, the output end of the local oscillation leakage suppression unit is connected with the input end of the gain selection control unit, and the output end of the gain selection control unit is connected with the input end of the frequency synthesis control unit. By adopting the 5GNTN low earth orbit satellite frequency conversion device for realizing broadband coverage, through the design of broadband and large dynamic gain, the requirement of frequency coverage of a 5G NTN low earth orbit satellite from an s wave band to a ka wave band at present is met, and meanwhile, an effective and broadband coverage frequency conversion means can be provided for navigation satellites, military satellites and the like.

The invention relates to harmonic conversion gain reduction for mixer circuits. The mixer circuit may include a first mixer transistor configured to receive a first oscillation signal, a second mixer transistor configured to receive a second oscillation signal, and a harmonic conversion gain suppression filter coupled between a source terminal of the first mixer transistor and a source terminal of the second mixer transistor. The harmonic conversion gain suppression filter may be configured to suppress a harmonic conversion gain of the mixer circuit. The mixer circuit may also include a third mixer transistor configured to receive the first oscillation signal, a fourth mixer transistor configured to receive the second oscillation signal, and another harmonic conversion gain suppression filter coupled between a source terminal of the third mixer transistor and a source terminal of the fourth mixer transistor. The mixer circuit may also include an output transformer and a notch filter interposed between coils of the output transformer.

A photonic image rejection radio frequency (RF) mixer and a receiver implementing the same may suppress undesired mirror image signals having frequencies at a spectral location that is mirror-symmetric, with respect to a local oscillator (LO), to that of a signal of interest. An upconverted optical beam corresponding to a captured RF beam is extracted by an optical processor. The upconverted optical beam is mixed with the LO to obtain a desired composite optical signal and an undesired composite optical signal, each providing a corresponding beat frequency optical signal at the same frequency. The desired and undesired composite optical signals are captured by multiple optical pickups with relative phase shifts in their beat frequency optical signals which are converted into corresponding electrical signals and combined to suppress the undesired signal.

The invention discloses a low-phase noise signal generation device, which belongs to the technical field of low-phase noise signal generation, and comprises a power supply module, a VPX main control board, a baseband unit, a reference unit, a local oscillator and clock unit, a frequency reference unit and an output unit, the local oscillator and clock unit generates a clock signal and a local oscillator signal with low phase noise, and the baseband unit generates a baseband signal with low phase noise. The frequency reference unit obtains a broadband fine-step frequency reference signal, and the output unit finally generates an output signal of 10 MHz to 40 GHz. According to the low-phase-noise signal generation device, the fine frequency resolution advantage of the DDS technology and the broadband and low-phase-noise advantages of the analog direct frequency synthesis technology are perfectly combined through the original three-stage architecture of baseband DDS fine step generation, local oscillator PLL large step phase locking and direct frequency synthesis filling. Finally, the frequency of the output signal covers the ultra-wide range of 10 MHz to 40 GHz, and meanwhile, the ultra-fine frequency stepping is kept.

The application discloses a low-power-consumption mixing-priority type wideband receiver front-end module, which is based on a mixing-priority architecture, does not need to use an external matching network, realizes impedance matching from an antenna to a receiver front end, realizes high-Q band-pass filtering characteristics, and comprises a third harmonic mixer, a 12-stage ring voltage-controlled oscillator and a TIA transimpedance operational amplifier.The third harmonic mixer is connected with the 12-stage ring voltage-controlled oscillator and the TIA transimpedance operational amplifier.The 12-stage ring voltage-controlled oscillator provides a required local oscillator signal for the third harmonic mixer.The third harmonic mixer is used for down-converting an RF radio frequency signal into a zero intermediate frequency signal by using a third harmonic component of the local oscillator.The TIA transimpedance operational amplifier is used for effectively amplifying and filtering a zero intermediate frequency signal down-converted by the third harmonic mixer and then outputting the zero intermediate frequency signal.The application has lower power consumption than a conventional wideband receiver.