70 results about "Digital transmitter" patented technology

An RF transmitter (1) having a gate-segmented power output stage (2) and a digital driver (5). The gate-segmented power output stage (2) includes a field-effect transistor with a plurality of gate fingers (32) and drain fingers (31) that define a gate periphery. The field-effect transistor comprises a plurality of power output stage segments (3) that each correspond to a respective part of the gate periphery, and that each have a respective power output stage segment input (4). The digital driver (5) has control outputs (6) which are connected to corresponding ones of the respective power output stage segment inputs (4), and is configured for individually switching each of the power output stage segments (3) between an on mode and a cut-off mode in dependence of one or more input signals to obtain a modulated RF carrier signal at an output (7) of the gate-segmented power output stage (2).

The invention relates to the technical field of wireless communication, and discloses a high-efficiency low-cost aliasing mirror image interference elimination device for a digital transmitter. The device comprises a baseband signal processing module, a digital up-conversion module, an aliasing mirror image interference elimination module, a digital-to-analog conversion module and a transmitting module, the aliasing mirror image interference elimination module adopts a time domain compensation method, and an interference signal is compensated at a mirror image frequency point of a baseband signal; the mirror image problem generated by IQ mismatch and aliasing interference generated by mutual modulation between the digital high-frequency signal and the LO are eliminated at the same time. The device can complete IQ signal compensation by only needing two multiplications and one additive operation, has the characteristics of low implementation complexity and low cost, and can effectively improve EVM and ACLR performance of a transmitted signal.

Methods and apparatus for monitoring chirp in a modulated light beam. The modulated light is passed through a variable dispersion element or “VDE”, and the light from the variable dispersion element is detected to yield a signal. A parameter which represents the strength of modulation in the light after passage through the VDE such as the peak intensity of the modulated light is measured as the VDE is controlled to vary the applied dispersion. The chip is determined from the variation of the parameter with dispersion, such as from the dispersions at which the parameter is at minima. The method can be applied to beams modulated by common digital transmitters used in optical communication systems.

The invention discloses a radio frequency transmitter. The radio frequency transmitter comprises at least one main array and at least one impedance compensation array, the main array and the impedance compensation array are arranged in parallel; the main array comprises a plurality of basic units I, the impedance compensation array comprises a plurality of basic units II, the output ends of the basic units I are connected in parallel through a first signal line, and the output ends of the basic units II are connected in parallel through a second signal line; when the radio frequency transmitter works, X basic units I in the main array are opened, N-X basic units II in the impedance compensation array are opened, the opened basic units I in the main array work in response to a baseband control code, and the opened basic units II in the impedance compensation array work in response to a complementary signal of the baseband control code; and the impedance generated by the main array and the impedance generated by the impedance compensation array are mutually offset in a non-linear manner. Factors causing nonlinearity of a circuit can be eliminated fundamentally, the digital transmitter has the advantages of being insensitive to process corner, temperature, voltage and frequency changes, and the digital transmitter with high linearity, high robustness and broadband can be achieved.

The invention relates to an all-digital transmitter combining digital-analog interpolation filtering. The all-digital transmitter comprises a signal processing module, a multi-phase interpolation filtering module, a delay integration module, an image rejection preprocessing module, a frequency divider, a linear interpolation all-digital power amplifier, an SPI module and the like. According to the invention, various high-bandwidth communication protocols are supported, various working modes can be configured, the sampling rate is adjustable, and the reconfigurable characteristic is realized; a multi-phase architecture is adopted for multi-phase interpolation filtering and delay integration, the filtering function is achieved while interpolation sampling is completed, and the circuit works in a low-frequency state and has the advantage of being low in power consumption. A mirror image suppression preprocessing technology is adopted to realize a mirror image suppression effect on the frequency spectrum of the final transmitted data; on the basis of a linear interpolation DPA module, the data rate can be further improved while power synthesis is carried out, and the mirror signal suppression degree of an emission spectrum is ensured. The multi-mode low-power-consumption ultra-wideband antenna supports high bandwidth and wide frequency band, is configurable in structure, and has the characteristics of low power consumption, multiple modes, high out-of-band image rejection degree and the like.

An system includes a port to receive a number of bits at a first frequency. One or more cells generate a signal for a channel with a channel frequency that is N times greater than the first frequency. The cells transmit at a second frequency that is M times greater than the first frequency but is smaller than the channel frequency. Interface links are coupled between a portion of the input bits of the port and the one or more cells and the portion of the input bits is encoded by thermometer coded T bits such that each one of the T bits is encoded by M repeated parallel bits having a value of a respective T bit. Each interface link includes M interface lines between each T bit and each first cell, and M is smaller than N to reduce the number of interface lines for the T bits.

This disclosure provides a digital transmitter, relating to the field of transmitter technology. It includes: a baseband data generation unit for multi-phase output of baseband data; and a basic unit including an I-channel mixer and a Q-channel mixer. The I-channel mixer performs mixing processing on the multi-phase outputs of the positive-phase I-channel baseband data and the negative-phase I-channel baseband data, while the Q-channel mixer performs mixing processing on the multi-phase outputs of the positive-phase Q-channel baseband data and the negative-phase Q-channel baseband data. The positive-phase outputs of the I-channel and Q-channel mixers are respectively connected to the positive-phase RF input of the digital transmitter, and the negative-phase outputs of the I-channel and Q-channel mixers are respectively connected to the negative-phase RF input of the digital transmitter. This disclosure simplifies the circuit structure of traditional digital transmitters and enables effective bandwidth expansion. Furthermore, by introducing multi-tap filtering for the baseband data, better spectrum shaping can be achieved.

The invention discloses a gravity sensor and a control system, the control system comprises a plurality of gravity sensors, a digital transmitter and a control terminal, and the gravity sensors are connected with the control terminal through the digital transmitter. The gravity sensor comprises a base, an upper shell, a sensor body and an elastic piece. The upper shell is arranged above the base, the top of the sensor body is fixedly connected with a pressed object, and the base is fixedly connected with an application environment. An elastic piece through hole is formed in the middle of the elastic piece, the sensor body is arranged on the inner side of the upper shell and above the elastic piece, the sensor contact head at the bottom of the sensor body is arranged in the elastic piece through hole, when a pressed object is pressed, the sensor contact head is in contact with the top of the base, and therefore control information is output; and the sensor body is reset through the elastic piece. And the control terminal judges the triggering condition according to the control information uploaded by the gravity induction sensor.

The utility model discloses a sower sensor comprising an elastic body, a strain gauge, flexible PCBs and a digital transmitter, the strain gauge is a Wheatstone bridge composed of four half-bridge shear strain gauges, the flexible PCBs comprise a first flexible PCB and a second flexible PCB, and the digital transmitter is a digital transmitter. The input end of the first flexible PCB is electrically connected with the first half-bridge shearing strain gauge and the second half-bridge shearing strain gauge, the input end of the second flexible PCB is electrically connected with the third half-bridge shearing strain gauge and the fourth half-bridge shearing strain gauge, and the output end of the first flexible PCB and the output end of the second flexible PCB are electrically connected with the input end of the digital transmitter. And the digital transmitter is arranged at any axial end of the elastic body. According to the utility model, the four half-bridge shear strain gauges are attached in the four strain grooves of the elastic body, and the four half-bridge shear strain gauges are mutually compensated front and back and left and right, so that the sensor has very high precision and temperature change resistance.

This invention provides a high-precision calibration system and method for a multi-channel ADC, relating to the field of communication technology. The system includes a digital transmitter, a DAC module, a calibration loop, and a multi-channel ADC module connected sequentially. It also includes a correlation module, a parameter estimation module, and a compensation module. The correlation module is connected to both the digital transmitter and the multi-channel ADC module. The parameter estimation module is connected to both the correlation module and the compensation module. The compensation module is also connected to the multi-channel ADC module. The calibration loop connects the end of the transmit link and the beginning of the receive link. This invention combines the analog and digital domains through the calibration loop, achieving deviation compensation by performing a single cross-correlation operation and parameter estimation on the local reference signal and multiple sub-signals. This method eliminates the need to redesign analog circuits and does not rely on external instruments for calibration. It features low hardware complexity, high stability, and a short estimation cycle, without affecting normal service operation.

The invention provides a self-detection calibration device and method of a radio frequency emission system, and relates to the technical field of communication, the device comprises a digital transmitter, a DPD module, a peak detection module, a peak processing module, a DPD feedback loop and an adaptive DPD algorithm module, and also comprises a DPD controller and a PSAT detection module. By adding the functions of dynamic PSAT monitoring and feedback, peak monitoring and protection, self-adaption of DPD training and the like, the real-time stability and safety of a radio frequency transmitting system can be effectively improved, it is guaranteed that DPD works in the optimal interval, the overall correction quality is improved, and EVM and ACPR of radio frequency signals are guaranteed.

1. The name of the design product: digital transmitter (basic version). 2. The use of the design product: conversion module for converting weighing sensor signal into digital signal transmission to PLC. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: front view.

The invention discloses a pulse distortion correction method for a multi-level phase-shifting all-digital transmitter, and relates to the field of all-digital transmitters, and the method comprises the steps: determining a relational expression between a total time delay error and a phase-shifting control word; determining an integral multiple error relationship between the total time delay error and the phase shift control word based on a relational expression between the total time delay error and the phase shift control word; calculating a preprocessed phase shift control word according to an integral multiple error relation between the total time delay error and the phase shift control word; calculating a compensation control word according to the total duty ratio change error and the preprocessed phase shift control word; controlling the delay amount of the carrier signal according to the compensation control word to obtain a carrier signal with a duty ratio change error; generating a corrected carrier signal based on the carrier signal with the duty cycle change error; and performing delay processing on the corrected carrier signal according to the pre-processing phase shift control word, and performing amplification synthesis on the output signal. According to the invention, adaptive correction processing of pulse waveform distortion can be realized, and the linear performance of ADTx is improved.

The embodiment of the invention discloses a phase-locked loop, a digital transmitter and communication equipment, the phase-locked loop comprises a phase discrimination circuit, an oscillation circuit and a feedback circuit, the phase discrimination circuit comprises a time-to-digital converter and a digital filter, the oscillation circuit comprises an oscillator, and the digital filter is coupled between the output end of the time-to-digital converter and the input end of the oscillator; the feedback circuit comprises a first frequency divider and a second frequency divider, the first frequency divider is coupled between the output end of the oscillator and the input end of the second frequency divider, the second frequency divider is coupled between the output end of the first frequency divider and the input end of the time-to-digital converter, the frequency dividing ratio of the first frequency divider is variable, and the frequency dividing ratio of the second frequency divider is fixed. According to the phase-locked loop provided by the embodiment of the invention, the accuracy of the output signal of the phase-locked loop can be improved.

An electronic device may include wireless circuitry with a baseband processor, a digital transmitter, a digital-to-analog-converter (DAC), and an antenna. The baseband processor may produce baseband signals. The digital transmitter may generate self-interference-compensated signals based on the baseband signals. The DAC may generate radio-frequency signals for transmission by the antenna based on the self-interference-compensated signals and square-wave local oscillator waveforms. The digital transmitter may include a self-interference canceller that generates the self-interference-compensated signals. The self-interference-compensated signals may mitigate the creation of self-interferer repetition replicas that land on the carrier frequency of the radio-frequency signals. This may allow the radio-frequency signals to be free from error vector magnitude degradation and spectral regrowth that would otherwise be produced due to self-interference in the radio-frequency signals output by the DAC.

An electronic device may include wireless circuitry with a baseband processor, a digital transmitter, a digital-to-analog-converter (DAC), and an antenna. The baseband processor may produce baseband signals. The digital transmitter may generate self-interference-compensated signals based on the baseband signals. The DAC may generate radio-frequency signals for transmission by the antenna based on the self-interference-compensated signals and square-wave local oscillator waveforms. The digital transmitter may include a self-interference canceller that generates the self-interference-compensated signals. The self-interference-compensated signals may mitigate the creation of self-interferer repetition replicas that land on the carrier frequency of the radio-frequency signals. This may allow the radio-frequency signals to be free from error vector magnitude degradation and spectral regrowth that would otherwise be produced due to self-interference in the radio-frequency signals output by the DAC.

The invention discloses a local oscillator leakage adjusting circuit and a digital transmitter and an analog transmitter based on the local oscillator leakage adjusting circuit, and the local oscillator leakage adjusting circuit comprises a digital pre-modulator which is used for carrying out the power amplification or reduction of a local oscillator signal according to a first-level modulation code, and obtaining a local oscillator signal after first-level modulation, the primary modulation code is used for controlling the gain of the digital pre-modulator; the digital power amplifier is used for carrying out power amplification on the local oscillator signal subjected to primary modulation according to a secondary modulation code to obtain an output signal, and the secondary modulation code is used for controlling the gain of the digital power amplifier. The primary modulation code and the secondary modulation code are used for controlling the total gain of the output signal relative to the local oscillator signal to be a preset gain value all the time. According to the invention, local oscillator leakage is controlled through a digital device, parameter adjustment is not dependent on the device, broadband and good robustness can be realized, and extremely low local oscillator leakage can be realized.

The present invention discloses a radio frequency transmitter, comprising: at least one main array and at least one impedance compensation array; the main array and the impedance compensation array are arranged in parallel; the main array includes a plurality of basic units 1, and the impedance compensation array includes a plurality of basic units 2, the output ends of the basic units 1 being connected in parallel via a first signal line, and the output ends of the basic units 2 being connected in parallel via a second signal line; when the radio frequency transmitter is in operation, X basic units 1 in the main array are turned on, and N-X basic units 2 in the impedance compensation array are turned on, and the turned-on basic units 1 in the main array operate in response to a baseband control code, and the turned-on basic units 2 in the impedance compensation array operate in response to a complementary signal of the baseband control code, so that the impedance generated by the main array and the impedance generated by the impedance compensation array mutually cancel each other out. The present invention can fundamentally eliminate factors that cause circuit nonlinearity, has the advantage of being insensitive to changes in process angle, temperature, voltage, and frequency, and can realize a high-linearity, high-robustness, broadband digital transmitter.

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.

The invention provides a radio frequency signal sending method and system. The method comprises the following steps: generating a digital signal through a digital transmitter; converting the digital signal into a radio frequency signal through a signal conversion link; acquiring the digital signal and system state information corresponding to the digital signal from the digital transmitter through a digital control link, generating a control signal according to the digital signal and the system state information, and issuing the control signal; processing the radio frequency signal based on the control signal through a power amplifier to obtain a processed radio frequency signal; and transmitting the processed radio frequency signal through an antenna. According to the scheme, the complex design of an analog circuit is avoided, the state of the power amplifier can be flexibly adjusted according to scene changes such as signal bandwidth, the precision and performance are better, the radio frequency output requirements of low power consumption and high performance are met, and more efficient work can be ensured.

The present application discloses a method for correcting pulse distortion in a multi-level phase-shifted all-digital transmitter, which relates to the field of all-digital transmitters. The method comprises: determining a relationship between a total delay error and a phase-shift control word; determining an integer multiple error relationship between the total delay error and the phase-shift control word based on the relationship between the total delay error and the phase-shift control word; calculating a pre-processed phase-shift control word based on the integer multiple error relationship between the total delay error and the phase-shift control word; calculating a compensation control word based on the total duty cycle variation error and the pre-processed phase-shift control word; controlling the delay of a carrier signal based on the compensation control word to obtain a carrier signal with a duty cycle variation error; generating a correction carrier signal based on the carrier signal with the duty cycle variation error; delaying the correction carrier signal based on the pre-processed phase-shift control word, and amplifying and synthesizing the output signal. The present application can implement adaptive correction processing for pulse waveform distortion and improve the linear performance of ADTx.

The invention provides a closed-loop calibration system and method for IQ imbalance, and relates to the technical field of communication, the system comprises a digital transmitter, a power amplifier, a low noise amplifier and a digital receiver which are connected in sequence, and further comprises a digital correlator, a resolving unit, a phase controller and an IQ imbalance compensator; and the power amplifier is connected with the low-noise amplifier through a coupling loop. According to the invention, the analog phase and the digital phase of the loop are adjusted through the phase controller, and the simultaneous calibration of IQ imbalance in the digital transmitter and the digital receiver is realized by combining the four cross-correlation operation of the digital correlator and the parameter joint estimation of the calculation unit without a phase shift module. Phase switching can be realized by using an existing tuning capacitor of a power amplifier or a low-noise amplifier, the design is simple, and a coupling loop is close to an antenna port, so that the calibration precision is not easily influenced by interference and radiation of an internal radio frequency module; and meanwhile, hardware is easy to realize, the complexity is low, the estimation precision is high and the stability is strong.

This application provides a method, apparatus, and electronic device for adjusting the transmission power range, applied to a control module in a digital transmitter. The digital transmitter further includes at least one transmission module, each transmission module comprising multiple basic units, wherein the basic units include switched capacitor circuits based on multiple supply voltages. The method includes: determining, based on the initial transmission power range and the target transmission power range of the digital transmitter, the number of transmission modules that are turned on, the supply voltage of the basic units in the turned-on transmission modules, and an additional bit control signal for controlling the number of transmission modules that are turned on and the supply voltage of the basic units, thereby adjusting the corresponding transmission power range of the digital transmitter. In the above scheme, by adjusting the number of transmission modules that are turned on and the supply voltage of the basic units in the turned-on transmission modules, the corresponding transmission power range of the digital transmitter can be adjusted, thereby achieving a larger dynamic range of transmission power.

Neuron circuits are provided for spiking neural network apparatus having multiple such neuron circuits interconnected by links, each associated with a respective weight, for transmission of signals between neuron circuits. A neuron circuit includes a digital transmitter for generating trigger signals, indicating a state of the neuron circuit, on outgoing links of the circuit. The state is encoded in a time interval defined by these trigger signals. The neuron circuit includes a digital receiver for detecting such trigger signals on incoming links of the circuit, and digital accumulator logic. In response to detecting a trigger signal on an incoming link, the digital accumulator logic is adapted to generate a weighted signal dependent on the time interval and to accumulate the weighted signals generated from trigger signals on the incoming links to determine the state of the neuron circuit.

The invention relates to a digital flowing current measuring device which comprises a flowing current detector and a digital transmitter. The flowing current detector is used for collecting weak alternating current generated when sampling water is sheared, and the digital transmitter is used for processing the weak alternating current, judging the positive and negative polarities of the detected water and displaying and outputting the weak alternating current; the flowing current detector is provided with an irradiation-resistant part, electromagnetic compatibility and self-zero setting; and the digital transmitter is also provided with an irradiation-resistant part. The invention further comprises a working method of the digital flowing current measuring device. The beneficial effect of the invention is that a high-reliability solution is provided for monitoring the flowing current in a high-irradiation and strong-electromagnetic-interference scene. The device is suitable for wastewater treatment in the nuclear industry field, engine vibration monitoring and aircraft structure health monitoring in the environment field, reactor vibration monitoring and pipeline vibration monitoring in the petrochemical industry field, high-voltage transmission line vibration monitoring, wind driven generator vibration monitoring and other scenes.

The invention provides a multi-channel ADC high-precision calibration system and method, and relates to the technical field of communication, and the system comprises a digital transmitter, a DAC module, a calibration loop and a multi-channel ADC module which are connected in sequence, and also comprises a correlation module, a parameter estimation module and a compensation module. The correlation module is respectively connected with the digital transmitter and the multi-channel ADC module, the parameter estimation module is respectively connected with the correlation module and the compensation module, and the compensation module is further connected with the multi-channel ADC module; and the calibration loop is used for connecting the tail end of the transmitting link and the front end of the receiving link. According to the method, the analog domain and the digital domain are combined through the calibration loop, deviation compensation can be achieved by conducting single cross-correlation operation and parameter estimation on the local reference signal and the multiple sub-signals, the mode does not need to redesign an analog circuit and does not depend on an external instrument for calibration, hardware complexity is low, stability is high, the estimation period is short, and cost is low. And normal business operation is not influenced.

The invention relates to the technical field of digital transmitters, in particular to a digital millimeter wave transmitter which comprises a coupler, an orthogonal digital modulator and a digital-analog mixed mode Doherty power amplifier. Wherein the coupler is used for generating a broadband orthogonal signal and inputting the broadband orthogonal signal into the orthogonal digital modulator so as to realize QAM (Quadrature Amplitude Modulation) of the broadband orthogonal signal, and the orthogonal digital modulator inputs the modulated broadband orthogonal signal into the digital-analog mixed mode Doherty power amplifier so as to carry out power amplification on the modulated signal. According to the digital millimeter wave transmitter, through collaborative design of digital modulation and the mixed mode Doherty power amplifier, high system efficiency is achieved under the conditions of high peak-to-average ratio and high-power output, energy consumption is remarkably reduced, a quadrature amplitude modulation (QAM) modulation precision and signal linearity are improved by adopting the quadrature digital modulator and a precise amplitude / phase control mechanism, and the digital millimeter wave transmitter has the advantages of being simple in structure, low in cost and high in reliability. And high-speed data transmission is supported, and the requirement of a 5G system for high-capacity communication is met.

The utility model provides a lightning protection structure of a radio and television digital transmitter, which relates to the technical field of lightning protection components and comprises a lightning protection body and a fixed substrate, a bottom column is fixed at the bottom of the fixed substrate, a small-diameter push column is fixed at the bottom of the lightning protection body, catching grooves are arranged on the circumferential surface of the small-diameter push column in a linear array, and a limiting rack is fixed at the bottom of the small-diameter push column. A mode of installing a small-diameter push column is adopted to solve the problem that the minimum distance between a lightning arrester base and the ground is not less than 2.5 m in the lightning arrester installation process so as to ensure that gap discharge voltage is not reduced due to too short distance and the influence on the performance of the lightning arrester is avoided, however, in the face of actual situations, the installation positions of part of radio and television digital transmitters are relatively low, and the installation cost is relatively high. In the prior art, the requirement of the lightning arrester on the distance to the ground is difficult to meet, the application range of the lightning arrester is limited, the deployment difficulty of the lightning arrester in a specific environment is increased, the effectiveness of the whole lightning protection measure is influenced, and the normal operation and the service life of equipment are endangered.

The application discloses a multi-frequency reconfigurable all-digital transmitter chip, which comprises a multi-path baseband I / Q signal, a multi-frequency reconfigurable digital front-end processing module, a multi-frequency reconfigurable modulator module, a digital modulation output interface, a high-speed serial transmitter and a parameter configuration interface and control module; the multi-path baseband I / Q signal provides one or more paths of baseband I / Q data to be transmitted; the multi-frequency reconfigurable digital front-end processing module performs multi-phase interpolation and multi-phase up-conversion on the multi-path baseband I / Q data to form a multi-frequency composite digital signal; the multi-frequency reconfigurable modulator module is connected with the multi-frequency reconfigurable digital front-end processing module; the digital modulation output interface maps the multi-frequency digital modulation signal to a corresponding high-speed serial transmitter according to a transmission mode; the high-speed serial transmitter is connected with the digital modulation output interface to form a multi-frequency radio frequency signal; and the parameter configuration interface and control module are used for receiving external configuration data and controlling parameter configuration and starting timing of each module.