22results about "Angle modulation details" patented technology

This invention relates to the field of radio frequency (RF) power supplies, specifically to an RF power supply frequency tuning dynamic tracking method and system. The method includes the following steps executed sequentially: S1: Generating a frequency-modulated signal based on an initial carrier frequency and the frequency of a preset modulation signal; S2: Coupled sampling of the RF signal output from the RF power supply after power amplification, filtering the sampled signal, extracting the corresponding signal components, and calculating the corresponding reflection coefficient amplitudes; S3: Comparing the corresponding reflection coefficient amplitudes and selecting the minimum reflection coefficient amplitude; S4: Using the frequency corresponding to the minimum reflection coefficient amplitude as the new carrier frequency, and obtaining a new first sideband frequency and a second sideband frequency based on the new carrier frequency; S5: Repeating steps S1 to S4 based on the updated frequencies. This solution, through iterative updates of the carrier frequency and sideband frequency, possesses the ability to detect and track the reflection coefficient amplitude in real time, and significantly shortens the tuning time.

The invention relates to the field of radio frequency power supplies, in particular to a radio frequency power supply frequency tuning dynamic tracking method and system, and the method comprises the following steps: S1, generating a frequency modulation signal based on the initial carrier frequency and the frequency of a preset modulation signal; s2, carrying out coupling sampling on the radio frequency signal which is output by the radio frequency power supply and is subjected to power amplification, carrying out filtering processing on the sampled signal, extracting corresponding signal components, and respectively calculating corresponding reflection coefficient amplitudes; s3, the corresponding reflection coefficient amplitudes are compared, and the minimum reflection coefficient amplitude is selected; s4, taking the frequency corresponding to the minimum reflection coefficient amplitude as a new carrier frequency, and obtaining a new first sideband frequency and a second sideband frequency based on the new carrier frequency; and S5, repeatedly executing the steps S1 to S4 according to the updated frequency. According to the scheme, through loop iteration updating of the carrier frequency and the sideband frequency, the real-time detection and tracking capability of the reflection coefficient amplitude is achieved, and the tuning time is remarkably shortened.

The utility model provides a signal modulation and demodulation system of a digital isolator. The digital isolator and a pulse signal output end and a signal input end of a modulation module are respectively connected with a primary modulation node through a first switch; the first-stage modulation node is connected with the input end of the second-stage modulation node through the phase inverter; the RF signal output end is also connected with the input end of the secondary modulation node; the first switch is controlled by a level signal input by the signal input end to be switched on or switched off so as to control whether the pulse signal and the level signal can reach a primary modulation node for primary modulation or not, and a primary modulation signal is obtained; the secondary modulation node is controlled by the signal flowing out of the primary modulation node to be switched on or switched off so as to control whether the RF signal output by the RF signal output end and the signal flowing out of the primary modulation node can be subjected to secondary modulation or not, and a composite modulation signal is obtained. According to the utility model, two-stage precise modulation control is realized through the arrangement of the two-stage switch, so that the signal modulation precision of the digital isolator is remarkably improved.

This invention belongs to the field of mixed-signal circuits and relates to a modulator structure applied in a multi-charge pump phase-locked loop (PLL), specifically providing a method for implementing a modulator with fractional spurious emission suppression due to mismatch. In multi-charge pump PLLs, mismatches between different shunt charge pumps, such as current source mismatch and layout mismatch, can lead to integer boundary spurious emission. To alleviate the problem of integer boundary spurious emission degradation caused by mismatch in multi-charge pump PLLs, this invention proposes a method for implementing a modulator with fractional spurious emission suppression due to mismatch. This is achieved by making the net injected charge of long-range mismatch zero and filtering out the low-frequency components of the mismatch injected charge, thereby suppressing fractional spurious emission. Simulation results show that this invention can significantly suppress fractional spurious emission caused by mismatch.

This application provides a signal compensation method and circuit, a digital power amplifier, and a storage medium, relating to the field of signal processing. The signal compensation method includes: determining a compensation value for a distorted signal based on a preset memory group; the memory group storing a compensation table, the compensation table including the relationship between the compensation value and the distorted signal; and compensating the distorted signal using the compensation value; wherein the memory group includes multiple memories, each memory including different sub-compensation tables; the sub-compensation tables are parts of the compensation table, and all the sub-compensation tables constitute the compensation table. This signal compensation method can reduce the memory footprint in a digital compensation pre-distortion circuit.

The invention relates to a digital transmitter (10) for providing a high-frequency analog signal, the transmitter comprising: conversion means (3) for receiving a digitally modulated baseband signal (12) and providing a discrete spectrum of the digitally modulated baseband signal (12) in polar coordinates or in oblique coordinates; and a synthesis means (90) for generating the high-frequency analog signal on the basis of the discrete spectrum provided in polar coordinates or in oblique coordinates, where the synthesis means (90) is a means for performing a continuous inverse Fourier transform. The invention also relates to a method for providing a high-frequency analog signal, comprising: receiving a digitally modulated baseband signal; and providing a discrete spectrum of the digitally modulated baseband signal in polar coordinates or in oblique coordinates; and generating the high-frequency analog signal based on the discrete spectrum provided in polar coordinates or in oblique coordinates by performing a continuous inverse Fourier transform.

A variable reactance apparatus, tunable oscillator and method for changing a gain associated with an input signal of a tunable oscillator are disclosed. An embodiment of the variable reactance apparatus comprises a plurality of unit variable reactance structures comprising respective control input nodes, and a control circuit configured to connect each of the control input nodes to a respective signal from among a plurality of signals comprising a first tuning signal and a second tuning signal. An embodiment of a tunable oscillator comprises a resonance circuit, a negative impedance structure and a variable reactance apparatus configured for tuning of the oscillator. An embodiment of a method comprises altering connections of first and second tuning signals to control input nodes of respective first and second sets of unit variable reactance structures while holding constant a sum of the number of unit variable reactance structures in the first and second sets.

This modulator includes: a first energy distribution unit whereby a signal wave to be transmitted is distributed at a first ratio corresponding to a desired level for each side wave component; an even term side wave generation unit whereby one or more signals that have an even-numbered side wave component are generated on the basis of a carrier signal and the signal wave distributed at the first ratio by the first energy distribution unit; and an odd term side wave generation unit whereby one or more signals that have an odd-numbered side wave component are generated on the basis of the carrier signal and the signal wave distributed at the first ratio by the first energy distribution unit.　

The invention relates to an FMCW-based fill-level measuring device (1) which can operate in two frequency bands which are clearly delimited from one another. For this purpose, the fill-level measuring device (1) comprises two high-frequency units (11, 12), each having a frequency-controllable oscillator (111, 112), in order, in accordance with the FMCW principle, to generate radar signals (SHF1, 2) in the frequency bands or to receive same after reflection at the filling material surface. An antenna arrangement (13) is used to transmit and receive the radar signals (SHF1, 2) towards the filling material (L) and to receive same after reflection at the filling material surface, wherein a control / evaluation unit (14) can determine the fill level (L) on the basis of the received signal (RHF1, 2) of the first frequency band or of the second frequency band. According to the invention, the fill-level measuring device (1) is characterised by a common clock unit (15). This is used to form a phase-locked loop with both the first oscillator (111) and the second oscillator (121) in order to generate, in accordance with the FMCW principle, the corresponding radar signals (SHF1, 2, RHF1, 2) of the two frequency bands. As a result, it is unnecessary to provide a complete phase-locked loop for each of the two frequency bands. The number of required components is thus reduced.

Provided is a modulator comprising: a first energy distributing unit that distributes, at a predetermined ratio corresponding to a first level of each sideband component, a signal wave to be transmitted, which has been subjected to integration or an operation approximately equivalent to integration; an even-term sideband generating unit that generates one or more signals having an even-numbered sideband component, on the basis of a carrier signal and the signal wave distributed at the first ratio by the first energy distributing unit; and an odd-term sideband generating unit that generates one or more signals having an odd-numbered sideband component, on the basis of the carrier signal and the signal wave distributed at the first ratio by the first energy distributing unit.　

The application discloses a kind of miniaturization FM frequency modulation structure and method based on double tuning voltage-controlled amplification filter integrated chip, including single-chip microcomputer, crystal oscillator, phase detector, active loop filter, double tuning voltage-controlled amplification filter integrated chip, attenuator composition, PCM signal input double tuning voltage-controlled amplification filter integrated chip fine adjustment end, feedback signal is generated under the joint action with coarse adjustment end, feedback signal is transmitted to the reference signal output by phase detector and crystal oscillator, the signal generated is processed as the control voltage of double tuning voltage-controlled amplification filter integrated chip coarse adjustment end by phase detector controlled by single-chip microcomputer, output target FM modulated signal and carry out power amplification and filtering to signal;Single-chip microcomputer receives point frequency control signal, and controls phase detector to realize frequency synthesis function.The application provides a kind of miniaturization FM frequency modulation structure capable of reaching higher frequency accuracy and higher phase noise level.

The present invention provides a single-sideband phase-sensitive detection method, system, device, storage medium, and computer program product, which relate to the technical fields of signal processing and signal amplification and can be applied to signal detection and other situations. Specifically, a target signal in a detection system is repeatedly triggered, the modulation phase of a modulated signal is changed at each trigger time, and the target signal triggered each time is modulated based on the modulated signal to obtain multiple sets of detection signals with different modulation phases. The multiple sets of detection signals are post-processed to obtain multiple sets of equivalent single-sideband modulated signals, and the multiple sets of equivalent single-sideband modulated signals are demodulated to obtain processed signals. This improves the signal detection bandwidth and sensitivity.

Embodiments of the present disclosure relate to the field of phase-locked loops technology, and disclose a phase-locked loop, a radar system and a method for randomizing initial phases of FMCW signals. The phase-locked loop includes a phase-locked loop circuit (100) and a stochastic control signal generator (200). In response to a respective clock signal of the plurality of clock signals indicating a respective target moment of one or more target moments, the stochastic control signal generator (200) inputs a stochastic control signal to the phase-locked loop circuit (100), so that the accumulated value of the plurality of fractional frequency division values of the phase-locked loop circuit (100) is converted into a random value, and that a plurality of initial phase differences respectively corresponding to the plurality of chirp signals output by the phase-locked loop circuit (100) form a non-arithmetic sequence. A plurality of pieces of velocity information resulting from the spurious signals are distributed over different velocity dimensions. In this way, a strength of the spurious signals on individual velocity dimension can be decreased, and the two false targets having fixed velocities can be prevented from occurring, thereby improving the detection accuracy of the radar system. Moreover, the plurality of chirp signals can have random phases, thereby improving the anti-interference ability of the radar system.

A signal processing system and a signal processing method are provided. The signal processing method includes: in response to that a mode selection element receives a turn-off signal, outputting a first signal by the mode selection element; in response to that a switching element receives the first signal, switching from outputting a digital source signal to outputting a virtual signal by the switching element; in response to that a first delay element receives the first signal, outputting a first delay signal by the first delay element, where the first delay signal reaches a first voltage after a first delay time; and in response to that the first delay signal reaches the first voltage, stop outputting an output voltage by a power element.

This modulator comprises: an energy distribution unit that distributes a signal wave to be transmitted at a predetermined ratio according to a desired level for each sideband component; an even-term sideband generation unit that generates one or more signals having an even-numbered sideband component on the basis of a carrier signal and a signal wave distributed at a predetermined ratio by the energy distribution unit; and an odd-term sideband generation unit that generates one or more signals having an odd-numbered sideband wave component on the basis of the carrier signal and the signal wave distributed at the predetermined ratio by the energy distribution unit.　

This modulator comprises: an energy distribution unit that distributes, at a predetermined ratio corresponding to a desired level for each side wave component, a signal wave to be transmitted on which integration or operation approximately corresponding to integration has been performed; an even-numbered term side wave generation unit that generates one or more signals each having an even number-th side wave component on the basis of a carrier signal and the signal wave distributed at the predetermined ratio by the energy distribution unit; and an odd-numbered term side wave generation unit that generates one or more signals each having an odd number-th side wave component on the basis of the carrier signal and the signal wave distributed at the predetermined ratio by the energy distribution unit.　

The utility model provides a signal modulation and demodulation system of a digital isolator. The digital isolator and a pulse signal output end and a signal input end of a modulation module are respectively connected with a primary modulation node through a first switch; the primary modulation node is connected with the secondary modulation node through the second switch; the RF signal output end is connected with the transmitting unit through the secondary modulation node; the first switch is controlled by a level signal input by the signal input end to be switched on or switched off so as to control whether the pulse signal and the level signal can reach a primary modulation node for primary modulation or not, and a primary modulation signal is obtained; the second switch is controlled by the signal of the primary modulation node to be switched on or switched off so as to control whether the RF signal and the primary modulation signal can reach the secondary modulation node for secondary modulation or not, and a composite modulation signal is obtained. According to the utility model, two-stage precise modulation control is realized through the arrangement of the two-stage switch, so that the signal modulation precision of the digital isolator is remarkably improved.

The application belongs to the field of microwave power amplifier control, and particularly relates to a microwave power amplification modulation system based on coupling detection and intelligent shutdown protection, which comprises a preprocessing module, a joint modulation module, a microwave power amplification module, a coupling detection module and a hierarchical protection execution module. The preprocessing module obtains expected load delivery power through convolution coding and constellation mapping; the joint modulation module fuses an improved PID, scene recognition and dynamic decoupling to output a driving amplitude and a drain voltage instruction; the power amplification module is embedded with an impedance matching optimization algorithm to realize efficient amplification of signals; the coupling detection module separates fundamental wave, harmonic wave and stray interference power through joint decomposition, LSTM-CNN feature extraction and deep reinforcement learning; and the hierarchical protection module matches a hierarchical control template based on a power risk model and a knowledge graph. The system realizes power modulation and intelligent shutdown protection in multiple scenes and improves the operation stability of microwave equipment.

The present invention relates to a device for data transmission comprising a transmitter (10) for generating a frequency-modulated output signal (S5). The transmitter (10) has a phase-locked loop (30) for adjusting the output frequency of the output signal (S5) to a carrier frequency and a coupling circuit (20) for coupling a data stream (S1) to the phase-locked loop (30), wherein the output signal (S5) frequency-modulated by the coupled data stream (S1) has a time-variable output frequency, and wherein the coupling circuit (20) includes a compensation unit (22) that couples a compensation signal (S2) to the phase-locked loop (30), the compensation signal at least approximately adjusting the output frequency performed by the phase-locked loop (30) to the carrier frequency. The invention also relates to a method for data transmission using the device according to the invention.

A PLL circuit for generating a modulated carrier signal includes a digitally controlled oscillator (DCO) to generate the modulated signal. The PLL circuit receives a desired phase change as a modulation signal at each cycle of a non-uniform clock, derived from the a DCO output and a uniform reference clock. This phase change adjusts the DCO's frequency. The circuit also receives a frequency control word, representing the ratio of the desired carrier frequency to the reference clock frequency. The phase change and frequency control word are accumulated to predict the DCO's output phase. A non-uniform clock compensation circuit calculates a compensation value for the phase change. A phase detector estimates the error between the predicted phase and the time offset between the reference clock and DCO output, generating a control signal for the DCO based on this error.