148 results about "Frequency synthesis" patented technology

The invention belongs to the technical field of near-field imaging, and particularly relates to a microwave and millimeter wave near-field subsurface microscopic imaging device and method based on signal interference, and the device comprises a vector network analyzer, a signal separation device, a phase adjustment device, a semi-steel coaxial line, a displacement platform, and an industrial control computer. The vector network analyzer comprises a signal separation unit, a frequency synthesis source, a first receiver and a second receiver, wherein the frequency synthesis source, the first receiver and the second receiver are respectively connected with the signal separation unit and used for generating microwave and millimeter wave test signals. The signal separation device is respectively connected with the vector network analyzer, the phase adjusting device and the semi-steel coaxial line, and the displacement table is connected with the vector network analyzer through the industrial personal computer; the tail end of the semi-steel coaxial line, which is far away from the signal separation device, is provided with a conical needle tip-shaped near-field probe; and the needle tip of the near-field probe is vertical to the surface of a to-be-detected sample arranged on the displacement table.

The invention designs a broadband intermediate-frequency heterogeneous integrated communication transceiving micro module and a three-dimensional packaging method, and belongs to the technical field of advanced packaging. The micro module comprises a TSV silicon adapter plate, a Fan-out module, an HTCC ceramic substrate and a digital chip. The TSV silicon adapter plate adopts a high-resistance silicon substrate, and a coaxial shielding TSV structure is arranged on the TSV silicon adapter plate and comprises an inner layer signal through hole and an outer layer grounding layer. A frequency synthesizer chip and a radio frequency chip are embedded in the Fan-out module, and high-density horizontal interconnection is realized through a plurality of redistribution layers. The HTCC ceramic substrate is of a multi-layer laminated structure, and an impedance matching network is arranged in the HTCC ceramic substrate. The three-dimensional packaging method comprises the steps of TSV silicon adapter plate preparation, Fan-out module processing, digital chip stacking and system-level integration. High-density packaging of the radio frequency chip and the digital chip is achieved through the three-dimensional heterogeneous integrated architecture, and low-loss transmission of broadband signals is guaranteed through the coaxial shielding TSV structure and the impedance matching network.

The invention discloses a beat frequency comparison device mediated by an optical frequency comb. The beat frequency comparison device comprises the optical frequency comb, a first frequency stabilized laser, a first beat frequency device, a first frequency mixer, a first high-pass filter, a second frequency stabilized laser, a second beat frequency device, a second frequency mixer, a second high-pass filter, a DDS signal generator, a third frequency mixer and a low-pass filter. Frequency-stabilized lasers output by the first frequency-stabilized laser and the second frequency-stabilized laser and an optical frequency comb output by the optical frequency comb are subjected to beat frequency in the first beat frequency device and the second beat frequency device respectively, and first beat frequency and second beat frequency are obtained; the first beat frequency and the second beat frequency are mixed with the carrier envelope offset frequency of the optical frequency comb, and a first sum frequency and a second sum frequency are filtered out; the first sum frequency obtains a synthetic frequency through direct digital frequency synthesis; the second sum frequency and the synthetic frequency are mixed in the third mixer, and then the difference frequency is filtered out through the low-pass filter. According to the invention, beat frequency comparison of frequency-stabilized lasers with different wavelengths can be realized, and the influence of the stability of the optical frequency comb is avoided.

The invention relates to a small frequency source module with low phase noise, which is applied to the technical field of frequency sources, and comprises a dual-redundancy reference source unit, a dynamic temperature compensation unit, a frequency synthesis unit, an intelligent switching control unit and a structure protection unit, the main reference source module and the standby reference source module both adopt MEMS resonators with the Q value not smaller than 10000, the dynamic temperature compensation unit is used for dynamically adjusting the output frequency of the resonators according to the temperature, and the intelligent switching control unit is used for controlling switching between the main reference source module and the standby reference source module; through collaborative design of the high-Q-value MEMS resonator, dynamic temperature compensation and dual-redundancy intelligent switching, the problems of large size, high phase noise, large temperature drift and low reliability of a traditional frequency source module are solved, miniaturization design is realized, and strict requirements of scenes such as communication equipment and a navigation system on miniaturization can be met.

The invention discloses a direct digital synthesis method and system based on a mixed fraction proportion. The method comprises the following steps: determining an integer frequency control word, a numerator frequency control word and a denominator frequency control word based on a target frequency, a sampling frequency and a bit width of a phase accumulator; performing a fractional phase accumulation operation based on the sampling frequency, the molecular frequency control word, and the phase accumulator to generate a carry signal; performing integer phase carry and accumulation operation in parallel with the fractional phase accumulation operation according to the sampling frequency, the integer frequency control word and the phase accumulator to obtain an integer phase value; and acquiring a waveform digital amplitude corresponding to the integer phase value, and performing signal conversion according to the waveform digital amplitude to obtain an amplitude signal corresponding to the target frequency so as to improve the precision of the frequency synthesis signal.

The invention provides a multi-channel microwave signal generation method and system with a fixed initial phase, and the method comprises the steps: responding to a triggering signal received by a high-speed clock synchronization module after a pre-configured synchronous clock signal is inputted to the high-speed clock synchronization module; the high-speed clock synchronization module generates a sampling clock signal and a logic clock signal based on the synchronous clock signal, responds to the logic clock signal and inputs the logic clock signal to the high-speed controller, the high-speed controller generates a signal description word while triggering signal input, responds to the sampling clock signal and inputs the sampling clock signal to the direct digital frequency synthesis module; and the direct digital frequency synthesis module generates an analog fundamental frequency signal required by the multi-channel microwave signal source based on the signal description word, responds to the analog fundamental frequency signal and inputs the analog fundamental frequency signal to the phase-locked loop device, and the phase-locked loop device outputs a final target microwave signal.

The invention provides a dynamic phase compensation method based on double DDS modules, and belongs to the technical field of digital frequency synthesis. The invention provides the following technical scheme: 1, a dynamic phase inheritance mechanism: through alternate work of double DDS modules, seamlessly transmitting an integer part and a decimal remainder contained in a phase accumulated value of a main DDS to a standby DDS during switching, and combining a shared clock source and a high-speed multiplexer to ensure phase continuity; 2, remainder compensation closed-loop control is carried out, a remainder accumulator is designed to record truncation errors in real time, FTW is dynamically adjusted through a PID algorithm, and long-term frequency error closed-loop suppression is achieved in combination with feedback of an external frequency meter; 3, according to a dual-mode triggering strategy, time period triggering and phase threshold triggering are supported, switching logic is started when a triggering condition (a fixed period or a phase threshold theta th is set) is met, and the phase accumulated value theta 1 (t) and the remainder epsilon 1 of the DDS1 are transmitted to the DDS2. According to the invention, through dynamic phase synchronization and closed-loop compensation, the problems of DDS phase accumulative errors and switching discontinuity are systematically solved.

The invention provides a method for constellation time keeping in a free operation state of a satellite-borne atomic clock, and the method comprises the steps: generating an adjustable second time frequency signal through frequency synthesis based on a first time frequency signal outputted by the satellite-borne atomic clock; comparing and measuring the phase difference between the two and sending the phase difference to an inter-satellite link; through inter-satellite measurement and interaction, obtaining a clock error between the second time frequency signals of all satellites, and converting to obtain a clock error between the first time frequency signals of all satellites; and on the basis, a clock difference parameter between the constellation time and the first time-frequency signal is calculated and converted into a clock difference parameter between the constellation time and the second time-frequency signal, a frequency adjustment parameter is generated through a control algorithm, and the second time-frequency signal is controlled to gradually approach the constellation time. The invention further provides a device for constellation time keeping in the free operation state of the satellite-borne atomic clock. Therefore, the free operation requirement and the irregular frequency modulation requirement of the satellite-borne atomic clock under the navigation constellation autonomous time keeping scene can be considered, and the constellation autonomous time keeping precision and the user service performance are improved.

This invention discloses a stable amplitude control system for a high-Q MEMS resonator. This system is a digital closed-loop drive system based on a field programmable gate array (FPGA) as the control platform and DDS-PLL technology as the control scheme. The system uses a digital phase-locked loop (DPS) algorithm for frequency synthesis to track the gyroscope's vibration resonant frequency and phase. This structure utilizes the DDS algorithm to provide a high-resolution frequency signal, ensuring sufficiently small frequency steps. The PLL's bandpass characteristics also effectively suppress some spurious signals in the DDS output spectrum, achieving the complementary advantages of DDS and PLL. This improves the dynamic performance of the high-Q MEMS resonator control system, optimizes the stability accuracy of the MEMS gyroscope's amplitude and frequency, and further enhances the MEMS gyroscope's zero-bias output and anti-interference capabilities.

A frequency synthesis circuit includes a first inductor coupled to receive a first input signal at an input frequency, and a second inductor coupled to receive second input signal at the input frequency and out-of-phase relative to the first input signal. The circuit has first and second transistors with control terminals coupled to the first and second inductors, respectively. A first resonant tank of an inductor in parallel with a capacitor is coupled between a power supply terminal and the first transistor. A second resonant tank of an inductor in parallel with a capacitor is coupled between the power supply terminal and the second transistor. The first and second resonant tanks are tuned to a selected harmonic of the input frequency. An injection-locked oscillator has inputs coupled to the first and second transistors.

The invention relates to the technical field of signal acquisition, and discloses an RFSoC-based inter-board synchronization platform and method, the RFSoC-based inter-board synchronization platform comprises a frequency synthesis board, a time sequence control board and a plurality of acquisition board cards, the output end of the frequency synthesis board is connected with the input end of the time sequence control board and the input ends of the plurality of acquisition board cards, and the output end of the frequency synthesis board is connected with the input end of the time sequence control board. The output end of the time sequence control board is connected with the input ends of the plurality of acquisition board cards; the frequency synthesis board is used for outputting a reference clock signal to the time sequence control board and the plurality of acquisition board cards; the time sequence control board is used for synchronously outputting a synchronous trigger multiplexing signal to the plurality of acquisition board cards according to the reference clock signal, receiving synchronous deviation information of the plurality of acquisition board cards and carrying out time sequence synchronous correction on the plurality of acquisition board cards according to the synchronous deviation information; and the plurality of acquisition board cards are used for synchronously executing corresponding actions according to the synchronous triggering multiplexing signals. The method has the beneficial effects that the synchronism among the acquisition board cards is effectively improved, and the acquisition board cards and the acquisition channels in the acquisition board cards are ensured to be in a synchronous state.

The present invention relates to a satellite navigation signal system design method based on hybrid modulation of direct sequence spread spectrum and frequency hopping. The method comprises: spreading code sequences of multiple signal components being modulated and being then hybrid-multiplexed with signal components corresponding to a same frequency point, and forming a baseband code sequence on the basis of power allocation ratios of the signal components; on the basis of environment conditions, performing signal separation on the signal components corresponding to the baseband code sequence, in order to obtain separated radio frequency signals, and performing recombination and modulation on the signals; if the separated radio frequency signals are authorized signals, controlling a frequency hopping pattern by means of a frequency hopping code sequence, and performing hybrid frequency synthesis modulation on the basis of a center frequency point of the frequency hopping pattern and the frequency of the authorized signals; if the separated radio frequency signals are unauthorized signals, performing direct combining and radio frequency modulation on the unauthorized signals on the basis of a signal frequency point, in order to obtain recombined signal components; and performing signal power amplification on the basis of a center frequency point difference of the recombined signal components, in order to obtain direct sequence spread spectrum navigation signals. The method can greatly improve the anti-jamming capability of navigation signals.

The embodiment of the application provides a kind of wide frequency signal dynamic generation method and system based on multiple clock sources, the method comprises: by field programmable gate array real-time monitoring target frequency, and based on the frequency band of target frequency belongs to automatically switched to corresponding target clock source;When the target clock source is switched, the phase difference corresponding to the new and old target clock source is corrected by phase compensation register, and the compensation value is loaded to the phase offset register of direct digital frequency synthesis chip;Based on direct digital frequency synthesis chip, generate the fundamental wave waveform of wide frequency signal, and superimpose multiple harmonic components by sub-accumulation method, and the amplitude of each harmonic is independently controlled by look-up table method;The output signal of power amplifier is extracted by analog-digital converter, and the error information of measured waveform and theoretical waveform is extracted and dynamically corrected phase offset register and harmonic amplitude look-up table coefficient, and output target wide frequency signal.The application realizes the unity of wide frequency coverage, high resolution and fast response.

The invention discloses a noise frequency modulation signal generation device, which is realized based on a field programmable gate array (FPGA), and adopts the following method steps: S1, in the FPGA, constructing an arbitrarily distributed random number generator to obtain random numbers conforming to distribution; s2, linearly mapping the obtained random number into a frequency modulation noise bandwidth by using a linear mapping method to obtain a random frequency conforming to Gaussian distribution; and S3, converting the obtained random frequency into frequency modulation noise by using a direct digital frequency synthesis technology. Complex linear algebraic operation is simplified into integer addition, subtraction and shifting, FPGA parallelism and special hardware resources are fully utilized, high speed, low resources and high statistical quality are considered, and a reliable hardware noise source is provided for scenes such as communication simulation and radar interference.

The application discloses a direct digital frequency synthesizer based on RBF neural network of phased optimization, which comprises a phase accumulator responsible for generating a phase signal, an RBF neural network module responsible for converting the phase signal into a digital amplitude signal, a digital-analog converter responsible for converting the digital amplitude signal into a low-frequency sawtooth signal and a low-pass filter responsible for converting the sawtooth signal into a smooth analog signal. The RBF neural network module comprises a hidden layer and an output layer, each node in the hidden layer has a corresponding radial basis function, so as to map a corresponding characteristic value for each input phase information, multiply the corresponding characteristic value of each node with the corresponding weight in the output layer, and then sum up to obtain an amplitude value corresponding to the phase information. Compared with the prior art, the application introduces the RBF neural network, so that the direct digital frequency synthesizer has stronger scalability and adaptability when processing complex and nonlinear frequency synthesis tasks.

The application discloses an arrayed multi-path frequency-locked magnetron monitoring system, which comprises an arrayed multi-path magnetron, a multi-path coupling mixer capable of receiving signals emitted by the arrayed multi-path magnetron, a multi-path filter-amplifier assembly connected with an output end of the multi-path coupling mixer, a time-division multi-selection switch connected with an output end of the multi-path filter-amplifier assembly, an output end of an AD sampling assembly is connected with a data processing system and a multi-path frequency synthesis source respectively, an output end of the multi-path frequency synthesis source is connected with a mixing frequency input end of the multi-path coupling mixer, and the monitoring system further comprises a reference clock connected with the AD sampling assembly and the multi-path frequency synthesis source. The application adopts multi-path coupling mixing, multi-path switching, AD acquisition and data processing on multi-path signals in time division, obtains multi-path magnetron parameter information in time division, and improves sampling accuracy by adopting multi-path frequency synthesis source feedback, and reduces equipment volume and power consumption.

The invention discloses a radar beacon device with power measurement feedback adjustment and a power measurement feedback adjustment method. The radar beacon device comprises a data processing unit used for receiving parameters and control instructions, processing uploaded measurement power information and controlling an attenuation value; the signal processing unit is used for outputting a synchronous trigger signal to the power measuring unit; the microwave frequency conversion unit is used for realizing receiving, modulation and frequency synthesis of radio frequency signals; the power measurement unit is used for collecting observation signals, performing synchronous detection by combining with the synchronous trigger signals, and outputting measurement data to the data processing unit; and the display control unit is used for setting equipment working parameters and displaying the current state and power information of the equipment. According to the invention, the power measuring device is additionally arranged to monitor a transmitting signal, and a monitoring result is fed back to the control unit to control the transmitting link attenuator to set a corresponding attenuation value, so that the actual output power is consistent with the set power value, the problem of outputting absolute power is solved, and the requirement of high power precision is met.

The application relates to the field of frequency synthesis technology and discloses a low-phase-noise phase-locked loop spurious suppression system and method, which comprises a control module, an oscillator module connected with the output end of the control module, wherein the oscillator module comprises a plurality of oscillator units, a mixing and filtering module connected with the output end of the oscillator module, which is used for mixing and filtering a plurality of reference frequency signals output by the oscillator module and outputting a target reference signal, a signal selection switch used for receiving a control instruction sent by a central processing unit, a fractional-N phase-locked loop used for receiving a system reference clock signal and outputting a radio frequency output signal, and the central processing unit used for receiving a target output frequency signal and determining the system reference clock signal based on the target output frequency signal and the target reference signal. While the spurious is suppressed, the super-low phase noise characteristic of the reference source is maintained, the output frequency is continuously and accurately kept before and after switching, and the low phase noise and low spurious are simultaneously realized.

The invention provides an L-band transceiving front-end module. The L-band transceiving front-end module comprises a control unit, and a receiving channel, a transmitting channel, a self-checking circuit, a frequency synthesis unit and a power supply unit which are connected with the control unit, the receiving channel adopts a secondary frequency conversion superheterodyne architecture and is used for converting a received radio frequency signal into an intermediate frequency signal and outputting the intermediate frequency signal to the digital processing part, and the transmitting channel adopts a primary frequency conversion architecture and is used for converting an input intermediate frequency signal into a radio frequency signal and outputting the radio frequency signal; and the frequency synthesis unit is used for providing local oscillation signals for the frequency mixers of the receiving channel and the transmitting channel. According to the invention, the receiving and transmitting isolation is improved, the interference of transmitting on receiving is reduced, the connection between the receiving channel and the antenna in the transmitting mode can be cut off through the design of the receiving on-off switch, the transmitting signal is effectively prevented from entering the receiving channel in series, the purity of the receiving signal is ensured, and the stable realization of the receiving function is ensured.

The application discloses a direct digital synthesis method and system based on a mixed fractional ratio, and the method comprises the following steps: determining an integer frequency control word, a numerator frequency control word and a denominator frequency control word based on a target frequency, a sampling frequency and a bit width of a phase accumulator; performing a fractional phase accumulation operation based on the sampling frequency, the numerator frequency control word and the phase accumulator to generate a carry signal; performing an integer phase carry and accumulation operation in parallel with the fractional phase accumulation operation according to the sampling frequency, the integer frequency control word and the phase accumulator to obtain an integer phase value; and obtaining a waveform digital amplitude value corresponding to the integer phase value to perform signal conversion according to the waveform digital amplitude value to obtain an amplitude signal corresponding to the target frequency, so that the accuracy of a frequency synthesis signal is improved.

This invention discloses a time amplifier with self-cancelling quantization noise and a fractional-frequency division phase-locked loop (PLL), belonging to the field of frequency synthesis technology. The self-cancelling quantization noise time amplifier of this invention is based on a resistor-discharge type time amplifier. A control signal containing quantization error information is output through a slow-slope control signal generator to control the slow-discharge path of the time amplifier. This achieves K-fold time error amplification while simultaneously canceling fractional-frequency division quantization noise. The PLL architecture built based on this amplifier eliminates the need for a large-delay loop digital-to-time converter. The phase noise of the slow-slope control signal generator is suppressed by the time amplification gain, breaking the performance trade-off of traditional architectures. This invention achieves a low-noise, low-power, and high-linearity fractional-frequency division PLL design without degrading the performance of the time amplification phase detector.

The application relates to a digital frequency synthesizer, a signal compensation method, an SOC chip and electronic equipment, and belongs to the integrated circuit field.The digital frequency synthesizer comprises a digital frequency synthesis unit, a phase compensation unit and a phase adjustment unit; the digital frequency synthesis unit is used for generating a first clock signal with a first specified duty cycle according to an externally input first digital phase enable binary code and a multi-path initial phase clock signal; the phase compensation unit is used for generating a target compensation clock signal with a corresponding phase width according to required phase accuracy; and the phase adjustment unit is used for generating an output clock signal with a second specified duty cycle according to the target compensation clock signal and the first clock signal. The first clock signal is compensated by generating the target compensation clock signal with the required phase width, so that a clock signal with an arbitrary duty cycle can be output, and the problem that the existing digital frequency synthesizer can only output a clock signal with a specific frequency is effectively improved.

1. The name of the design product: local oscillator board (ZP128). 2. The use of the design product: the design product is a frequency synthesis module, which is used to provide a reference frequency source signal and used as a mixing reference signal during frequency conversion. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

The utility model relates to the field of radio transceiving, and discloses an ultra-wideband extremely-small-step frequency hopping frequency synthesizer module. According to the invention, the high-speed dot frequency array divides an ultra-wideband frequency 9-18GHz signal into 8 segments, and the 8 segments are respectively shifted and converted to 1000-2200MHz for frequency and phase discrimination, so that the phase discrimination frequency is greatly reduced, excellent phase noise can be obtained, and ultra-wideband frequency coverage is realized at the same time. The adopted high-speed dot frequency phase-locked array is low in phase noise and large in frequency span coverage, the switching time is short through a high-speed switch, large-range fast frequency hopping can be achieved, and powerful support is provided for prolonging the large-range frequency hopping time of a whole circuit system. A DDS direct digital frequency synthesis circuit is adopted, near-end stray is low, high-frequency resolution is provided, and extremely low frequency stepping can be achieved. And the frequency hopping speed is high and reaches below 1uS, so that the rapid frequency hopping of the frequency synthesizer system can be realized.

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.

This invention belongs to the field of laser power supply technology and relates to a high-power, high-repetition-rate short-pulse driving power supply system. The system includes a DC-DC module, a pulse power generation module, an operating parameter detection module, and a control module. This invention employs frequency synthesis to generate high-repetition-rate pulse current, achieving a higher pulse current repetition rate compared to a single power transistor. It uses a GaN power transistor as the main power transistor, which has lower on-resistance, higher switching frequency, and faster turn-on time. In the system feedback, an FPGA chip and a high-speed ADC are used for current sampling, enabling feedback control of the high-repetition-rate pulse current.

The invention discloses an automatic repair type frequency source and an implementation method thereof, and belongs to the technical field of radar communication and frequency synthesis. In order to solve the problems that after a traditional frequency source breaks down, the maintenance efficiency is low, and the shutdown loss of a system is large, a double-backup hardware architecture of two sets of phase-locked loops and two sets of radio frequency signal conditioning circuits is adopted, intelligent management of power supply and signal paths is achieved through a radio frequency switch network, and the working state of each assembly is collected in real time through a monitoring module; and the FPGA control unit executes an automatic repair action based on a locking detection signal and a level signal fed back by the monitoring module, so as to realize instant diagnosis and seamless switching of a fault. According to the invention, the fault repair time is shortened from several days in the prior art to milliseconds, the zero-shutdown operation of the system is realized, the economic loss of hundreds of thousands of yuan is effectively avoided by increasing the hardware cost of thousands of yuan, and the usability and maintainability of the high-reliability electronic system are remarkably improved.

The embodiment of the invention discloses a frequency synthesis circuit and method, and the circuit comprises a power divider, the input end of the power divider is connected with a reference clock signal, and the power divider is used for distributing the reference clock signal into a plurality of sub-reference signals, and outputting the plurality of sub-reference signals through the corresponding output end of the power divider; wherein the sub reference signals are consistent in phase and equal in power; a plurality of phase-locked frequency multiplication channels, the input end of each phase-locked frequency multiplication channel is correspondingly connected with the output end of the power divider, and the phase-locked frequency multiplication channels are used for performing phase-locked frequency multiplication processing according to the corresponding sub reference signals to generate first frequency signals; and the input end of the synthesis control module is connected with the output ends of the plurality of phase-locked frequency multiplication channels, and the synthesis control module is used for synthesizing the plurality of first frequency signals to generate a final output signal. According to the technical scheme provided by the embodiment of the invention, the signals with the same frequency and phase correlation are generated through the multiple phase-locked frequency multiplication channels, so that the frequency spectrum purity of the signals is improved.

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 invention discloses an integrated millimeter-wave radar radio frequency front-end system, which relates to the technical field of millimeter-wave radars and comprises a frequency synthesis module, a transmitting channel and a receiving channel. The frequency synthesis module generates and outputs a high-band linear frequency modulation signal. The input end of the transmitting channel is connected with the frequency synthesis module, and the transmitting channel comprises a frequency multiplication link, a power amplifier based on the gallium nitride technology and a first filter and is used for performing up-conversion processing on signals to W wave bands and performing antenna radiation after power amplification and harmonic suppression. And the receiving channel local oscillation end is connected with the frequency synthesis module to obtain a local oscillation signal, the signal input end is connected with an antenna, and the receiving channel comprises a low-noise amplifier, a second filter, an image rejection filter and a frequency mixer and is used for amplifying, filtering and down-converting the W-band echo signal. The invention has the advantages of miniaturization, low loss, low phase noise and high efficiency.