167 results about "Harmonic rejection" patented technology

The invention discloses a multi-dimensional time sequence photovoltaic grid-connected harmonic current prediction control method, and particularly relates to the technical field of power system control. Grid-connected original multi-dimensional electrical signals are collected and decomposed into multi-dimensional frequency signals through Fourier transform, the characteristic components of an independent harmonic source are separated through the blind source separation and non-negative matrix factorization technology, and the frequency and amplitude characteristics of the characteristic components are extracted; then, a multi-dimensional time sequence prediction model is constructed through a recurrent neural network, dynamic behaviors of multiple harmonic sources are predicted at the same time, and frequency domain data are reconstructed and frequency aliasing errors are corrected in combination with high-frequency compensation and multi-scale analysis; and finally, inputting a prediction result into a photovoltaic inverter control system, dynamically generating a compensation current opposite to a target harmonic wave, realizing effective offset of the harmonic wave, accurately processing the multi-source harmonic wave problem in a complex power grid environment, and greatly improving the harmonic wave suppression capability, the electric energy quality and the system operation stability of a photovoltaic grid-connected system.

The invention discloses a method for predicting and suppressing harmonic waves generated by photovoltaic grid connection, which relates to the technical field of harmonic wave prediction, and comprises the following steps: detecting a three-phase current signal of a photovoltaic grid connection circuit by using an ip-iq detection method, and decomposing the three-phase current into an active component and a reactive component through Clarke conversion and Park conversion; according to the method, high-precision detection and separation of harmonic waves in the photovoltaic grid-connected system are realized by combining an ip-iq method with Clarke and Park transformation, dynamic modeling and harmonic signal prediction are performed by using the LSTM model, the defect of poor adaptability of a traditional method to nonlinear loads is overcome, and the prediction error is as low as 0.1%. Through combination of LSTM prediction and APF dynamic compensation, the compensation current opposite to the harmonic current is generated in real time, the harmonic suppression efficiency and the power grid stability are significantly improved, the electric energy quality is optimized, and the dynamic change of a complex load is adapted.

The utility model relates to a radio frequency power amplification circuit with a harmonic suppression function and a radio frequency chip. The radio frequency power amplification circuit comprises an input matching unit, a first-stage power amplification unit, a first-stage bias unit, a first-stage power supply unit, an inter-stage matching unit, a second-stage power amplification unit, a second-stage bias unit, a second-stage power supply unit and an output matching unit. According to the utility model, the LC type trap circuits are designed and used in the power supply unit and the inter-stage matching unit, so that secondary, tertiary and high-order harmonic suppression is realized in the radio frequency power amplification circuit; meanwhile, based on LC circuit structures in the power supply unit and the inter-stage matching unit, the inter-stage matching bandwidth is widened, and the linearity of the multi-stage power amplification unit is improved.

The invention belongs to the technical field of microwaves. The invention provides a broadband frequency selective surface radome with a wide-angle harmonic suppression function. According to the embodiment of the invention, the regular hexagonal periodic arrangement mode is selected, so that the structures of the FSS units under wide-angle incidence can be ensured to have good in-band wave-transparent characteristics and harmonic band suppression characteristics. By adopting the structure of the double-layer FSS unit, the wide wave-transparent bandwidth can be realized. A transmission zero point can be introduced by loading a circular hole on the aperture type FSS unit, and the position of the transmission zero point and the bandwidth of a stop band can be adjusted by adjusting the size of the circular hole, thereby achieving a good inhibition effect in a harmonic frequency band. By designing the FSS unit form, the wave-transparent bandwidth of the frequency selective surface structure is improved, and two transmission zeros are introduced at the harmonic position, so that good isolation is achieved in the harmonic band of the wave-transparent bandwidth. By optimizing the thickness and the stacking arrangement of the core layer, the filter has good passband transmission characteristics and harmonic band suppression characteristics under a large incident angle.

The embodiment of the invention provides an excitation signal generation method and system and a digital eddy current sensor, and the method comprises the steps: outputting a square wave signal through a pulse width modulation assembly of a microcontroller unit, and enabling the frequency and resolution of the square wave signal to be adaptive to eddy current probes with different inductance values; inputting the square wave signal into a low-pass filter for filtering, and setting the cut-off frequency of the low-pass filter, the suppression times of higher harmonics and the attenuation slope so as to output a sine wave signal with a target total harmonic distortion range; the amplitude of the sine wave signal is collected in real time, and the pulse width modulation duty ratio and the passband gain of a low-pass filter are dynamically adjusted in combination with a digital control algorithm, so that the sine wave signal is subjected to self-adaptive adjustment and correction and is output; and taking the sine wave signal as an excitation source of an eddy current probe, and driving the eddy current probe to carry out nondestructive testing. According to the invention, the excitation signal which gives consideration to high-frequency signal generation, deep harmonic suppression and digital adaptive adjustment can be generated.

The invention relates to the technical field of radio frequency integrated circuits, in particular to a harmonic suppression power amplifier combining a matching network and a feed network, which comprises a transistor, an input matching module, an output matching module, a stabilizing module and a bias module, the input matching module comprises a first parallel resonance unit, the first parallel resonance unit is used for second harmonic suppression, the output matching module comprises a series resonance unit and a second parallel resonance unit, the series resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic, and the second parallel resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic. The second parallel resonance unit is used for resonating at a third harmonic frequency and forms a high-impedance open circuit for the third harmonic, the output matching module is coupled to a drain electrode of the transistor, and the bias module comprises a grid bias sub-module and a drain bias sub-module. The grid bias sub-module is coupled to a connection node of the input matching module and the grid of the transistor, the drain bias sub-module is coupled to the output matching module, and the bias voltage of the transistor is jointly determined by the grid bias sub-module and the drain bias sub-module. The power amplifier has the effect of improving the efficiency level of the power amplifier while realizing harmonic suppression optimization.

The invention discloses a low-voltage gallium nitride power amplifier based on second harmonic suppression. The low-voltage gallium nitride power amplifier is used for solving the technical problem that the overall efficiency of a radio frequency system is low due to an existing radio frequency power amplifier. The amplifier comprises an input stage circuit, an input stage low-voltage gallium nitride transistor, an intermediate stage circuit, an intermediate stage low-voltage gallium nitride transistor, an output stage circuit, an output stage low-voltage gallium nitride transistor group, a drain bias capacitor, a drain bias voltage port and a secondary harmonic suppression output matching network, by arranging an input-stage low-voltage gallium nitride transistor, an intermediate-stage low-voltage gallium nitride transistor, an output-stage low-voltage gallium nitride transistor group, a secondary harmonic suppression output matching network and a corresponding connection relationship, the secondary harmonic suppression output matching network can be used for suppressing a low-voltage gallium nitride transistor on the basis of a low-voltage gallium nitride process technology. Harmonic suppression is directly carried out on the second harmonic, so that the output power and the power additional efficiency of the radio frequency power amplifier are improved, and the overall efficiency of a radio frequency system is improved.

The present invention discloses a harmonic suppression method, device, electronic device and storage medium, which relates to the field of harmonic suppression. The harmonics present in the current PCC voltage are determined by making a phase-by-phase difference between the PCC voltage of the isolated microgrid and the ideal target voltage, which can not only extract the integer harmonics, but also effectively determine the interharmonic components with unknown harmonic frequencies. The entire feedforward compensation process is able to reduce the impedance of the virtual synchronous generator within a wide band, reducing the voltage drop of the harmonic current introduced by the nonlinear load on the impedance of the virtual synchronous generator, thereby effectively suppressing integer harmonics and interharmonics with unknown frequencies, and achieving the effect of wide-band harmonic suppression. The entire control method achieves harmonic suppression by adjusting the three-phase voltage modulation wave of the virtual synchronous generator, does not require the addition of any additional hardware equipment, and has excellent economy.

The invention discloses a high-speed power supply conversion control method, which relates to the technical field of power supply conversion control, and comprises the following steps of: synchronously acquiring transient voltage waveforms and transient current waveforms at two ends of a power device in each pulse width modulation period through an analog-to-digital conversion module; and constructing a high-frequency waveform data frame containing a plurality of modulation periods based on a fixed time sliding window mechanism. According to the invention, through frequency domain monitoring and frequency spectrum characteristic quantitative analysis, a resonance response index is output, and a closed-loop mechanism from high-frequency waveform sensing to risk early warning is realized; the PWM dominant frequency and harmonic distribution are dynamically adjusted in combination with a digital controller, a frequency modulation avoidance and harmonic suppression cooperative control strategy is constructed, the adaptive capacity, stability and electromagnetic compatibility of the system when dealing with parasitic resonance interference are remarkably improved, and the method has outstanding engineering practicability and technical innovation.

The invention discloses a broadband power amplifier with an output reconfigurable network, and relates to the technical field of microelectronics, the broadband power amplifier with the output reconfigurable network adopts a three-stage amplification circuit with a gate width ratio of 1: 2: 8, and signal pre-amplification and gain improvement are realized through the first two stages of amplifiers; the last-stage eight-tracheid parallel structure outputs saturated power under high-voltage power supply and realizes power additional efficiency; the output reconfigurable network is controlled by a first switch and a second switch, the first switch is turned off and the second switch is turned on in a high-power mode, so that a compensation microstrip line is grounded to form a fundamental wave matching branch knot, the loss of a harmonic suppression network is avoided, and high-efficiency output is guaranteed; in a low-power mode, the first switch is switched on, the second switch is switched off, the first LC resonance unit and the second LC resonance unit jointly form a band-stop filtering network, secondary and third harmonic impedance is adjusted to be in a near-short-circuit state, so that generation of higher harmonics is restrained, phase distortion is offset through the compensation microstrip line, and the integrity of fundamental wave signals is maintained.

The invention discloses a low-noise harmonic suppression radio frequency system for filter band control. The low-noise harmonic suppression radio frequency system comprises a Chebyshev low-pass frequency hopping filter, a power element parameter control module, a harmonic suppression module and a low-noise amplifier, wherein the Chebyshev low-pass frequency hopping filter comprises a plurality of power elements; an external radio frequency signal is used as the input of the Chebyshev low-pass frequency hopping filter, and the output end of the external radio frequency signal is connected with the input end of the harmonic suppression module; the power element parameter control module is connected with a power element of the Chebyshev low-pass frequency hopping filter through a multiplexer switch; the input end of the harmonic suppression module is connected with the output end of the Chebyshev low-pass frequency hopping filter; the low noise amplifier is connected with the output end of the harmonic suppression module; the input end of the low-noise amplifier is connected with the output end of the harmonic suppression module. Through cooperative work of the modules, radio frequency signals can be efficiently processed, and the targets of frequency band control, harmonic suppression and noise suppression are achieved.

The invention relates to a harmonic suppression and dynamic voltage compensation method based on a composite control series filter, and belongs to the field of power electronic technology and electric energy quality control. Harmonic current passing through a primary winding of a transformer and a sudden rising or falling signal of power supply voltage are extracted, and after the two signals are controlled and combined into a reference signal, a voltage source inverter (VSI) connected with a secondary side of the transformer in parallel shows a controllable voltage characteristic. The control parameters of the harmonic current can enable the transformer to present relatively large controllable impedance to harmonic waves, so that harmonic wave isolation is realized. In addition, the VSI compensates for the system voltage deviation by detecting the voltage drop. And finally, establishing a simulation model to verify that the series active power filter based on the control strategy can isolate harmonic waves and effectively compensate voltage deviation. Harmonic suppression and dynamic voltage compensation functions can be realized at the same time, and the power quality of a middle-high voltage system is improved.

The invention discloses a balanced frequency tripling structure and terahertz equipment, which are applied to the technical field of terahertz, and comprise an odd-mode excitation structure connected with an input waveguide, a waveguide mode excitation structure connected with an output waveguide, and two coupling lines connected with the odd-mode excitation structure and the waveguide mode excitation structure, the two coupling lines are arranged in parallel to transmit differential signals; one coupling line is connected with a frequency doubling diode, the other coupling line is connected with another frequency doubling diode, and the two frequency doubling diodes form a balanced frequency doubling diode pair. Through the odd-mode excitation structure, electromagnetic waves can be converted into coupling line odd-mode work, so that radio frequency reverse excitation is carried out on the two frequency doubling diodes, and basic conditions for realizing idle harmonic suppression are constructed. And meanwhile, the odd mode excitation structure and the waveguide mode excitation structure can lock even harmonics generated by the frequency doubling diode in a nonlinear manner in the coupling line to form a high-integration-level idle harmonic loop, so that high efficiency of third harmonics can be ensured.

The invention discloses a high-efficiency high-harmonic-suppression high-power amplifier circuit with a switching function. The high-efficiency high-harmonic-suppression high-power amplifier circuit comprises a radio frequency input port, a first amplification module, a second amplification module, a first bias unit, a second bias unit, an output matching network, a first radio frequency output port and a second radio frequency output port, the radio frequency input port is used for receiving a radio frequency input signal; the first amplification module is used for performing first-stage amplification on a radio frequency input signal to obtain a first-stage amplification signal; the second amplification module is used for performing second-stage amplification on the radio frequency input signal to obtain a second-stage amplification signal; the first radio frequency output port and the second radio frequency output port are used for outputting a second-stage amplification signal; and the first bias unit and the second bias unit are respectively connected with the first amplification module and the second amplification module and are used for supplying power to the first amplification module and the second amplification module. High power, high harmonic suppression and high efficiency can be realized, the problem of insufficient efficiency of an amplifier circuit is solved, and output channel selection is realized.

The invention discloses a Si / SiC topological parallel inverter harmonic suppression method based on multi-harmonic observation and feed-forward compensation, and relates to the technical field of power electronics, and the method comprises the steps: monitoring each harmonic signal outputted by a Si IGBT inverter in a Si / SiC topological parallel inverter in real time, and determining the amplitude and phase of each harmonic signal; the Si / SiC topological parallel inverter is of a structure in which a Si IGBT (Insulated Gate Bipolar Translator) inverter and a SiC MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) inverter are connected in parallel Generating an adjusted current compensation signal based on a gain scheduling mechanism according to the amplitude and the phase; the adjusted current compensation signal is a current compensation signal which is equal in amplitude and opposite to a harmonic signal of the SiC MOSFET inverter; according to the invention, the harmonic suppression capability and the electric energy quality can be improved, and the method is suitable for a high-power electric power system and an application occasion with strict requirements on the electric energy quality.

The invention belongs to but not limited to the technical field of wireless energy transmission and electromagnetic energy collection, and particularly relates to a simple and compact ultra-wideband rectifying circuit and a design method thereof. Comprising a top-layer microstrip structure, a middle dielectric substrate and a bottom-layer metal floor, the top-layer microstrip structure and the bottom-layer metal floor are respectively positioned on the upper surface and the lower surface of the middle dielectric substrate; the top microstrip structure comprises a radio frequency input port, a broadband impedance matching network, a direct current blocking and passing capacitor, a diode topological structure, a harmonic suppression and harmonic recovery network and a direct current output port; the two diodes in the diode topology are directly connected with the direct current filter capacitor, so that the load impedance is effectively compressed, the harmonic suppression and harmonic recovery functions are realized, and the working frequency range of the rectification circuit is widened; according to the ultra-wideband rectification circuit, ultra-wideband impedance matching is realized through a section of short conical gradient transmission line, the design process of the rectification circuit is effectively simplified, and meanwhile, the ultra-wideband rectification circuit with a compact structure is realized.

The invention discloses a filtering class F power amplifier based on a multimode resonator. The problems of large size and low efficiency caused by common design of a filter and an amplifier are mainly solved. The system comprises an input matching network, a grid electrode direct current feed network, a drain electrode direct current feed network, a transistor, a harmonic suppression network and a filtering matching network, and the input matching network utilizes a pi-shaped circuit to convert standard impedance of an input port into conjugation of optimal source impedance of the transistor; the grid and drain direct-current feed network isolates radio-frequency signals from entering a direct-current power supply and enables the transistor to work at a proper quiescent working point; the harmonic suppression network shapes the drain voltage and current of the transistor; the filtering matching network can control harmonic impedance and participate in matching, so that the drain electrode of the amplifier can reach the optimal load impedance. According to the invention, the loss generated by device connection is obviously reduced, the advantage of low complexity is shown, and the method is suitable for being applied to communication systems such as base stations and radars.

The invention discloses a radio frequency switch, a radio frequency front-end module and electronic equipment, the radio frequency switch comprises N transistors and at least one harmonic suppression module which are sequentially connected in series, and N is an integer greater than 1. The harmonic suppression module is connected between the two connection electrodes corresponding to the two transistors, and the harmonic suppression module is used for suppressing harmonic signals in the radio frequency signals passing through the radio frequency switch. Wherein the transistors are field effect transistors, and two connection electrodes corresponding to the two transistors are two bulk electrodes or two grid electrodes. According to the invention, the harmonic suppression module is not directly connected to the main radio frequency path (that is, the harmonic suppression module is not directly connected to the source electrode or the drain electrode of the field effect transistor), but is connected between the two body electrodes or the two grid electrodes, and the connection mode can prevent other harmonic signals generated by the harmonic suppression module from influencing the main radio frequency path. Therefore, the radio-frequency signal can be normally transmitted on the main radio-frequency path.

The invention provides a power distribution network electric energy quality optimization method and device based on the residual capacity of an inverter, and relates to the technical field of electric power, and the method comprises the steps: building a double-layer optimization model based on the power distribution network parameters, the electric energy quality parameters and the electric energy quality limit value of a power distribution network; wherein the double-layer optimization model comprises an upper-layer model meeting system fundamental wave power flow and harmonic wave power flow equality constraints, and the upper-layer model comprises a harmonic suppression target function, a reactive compensation target function and a three-phase imbalance suppression target function; and under the condition that a photovoltaic inverter in the power distribution network meets power constraint, solving the upper-layer module by adopting a particle swarm optimization algorithm to obtain a harmonic suppression target capacity, a reactive compensation target capacity and a three-phase imbalance treatment target capacity of the power distribution network.

A linear power amplifier output harmonic suppression system inputs a driving signal with amplitude A1, phase and frequency f1 into a linear power amplifier, samples the signal output by the linear power amplifier, calculates the amplitude A1n of nth harmonic in the signal, generates a frequency multiplication signal with amplitude n, phase n and frequency n = nf1 according to the nth harmonic, and inputs the frequency multiplication signal into the linear power amplifier, signals output by the linear power amplifier are sampled, the amplitude A2n of the signals is calculated, and according to the suppression principle that the amplitude of the signals output by the linear power amplifier of the n-order harmonic suppression signals is the same as that of the n-order harmonic of the driving signals, and the phase is opposite to that of the n-order harmonic of the driving signals; the amplitude of the nth harmonic suppression signal is made to be Aharn = An + (A1n-A2n), and the phase of the nth harmonic suppression signal is made to input the driving signal and the nth harmonic suppression signal into the linear power amplifier to offset or attenuate nth harmonics.

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 application provides a harmonic suppression circuit of an inductive coupling energy transmission system, which places an auxiliary receiving circuit with a resonance frequency of 3 times, 5 times, 7 times or 2n+1 (n=1, 2, 3…) times of a fundamental frequency on a secondary side, configures a corresponding voltage stabilizing circuit on a direct current voltage output side of the auxiliary receiving circuit, and realizes a self-power supply function of a power utilization device such as a control circuit on the secondary side, and a quality factor Q of the auxiliary receiving circuit is i The harmonic suppression method is simple, does not affect power transmission of a main circuit, and can improve the efficiency of the inductive coupling energy transmission system.

The application relates to a high-voltage power-taking capacitor protection and harmonic suppression system and a circuit thereof, and belongs to the field of power distribution network intelligent control switch power taking. The circuit is arranged between an isolation transformer and a feeder terminal unit (FTU), and comprises an input protection circuit for suppressing input surge overvoltage and fast pulse group, a harmonic filter circuit for filtering out harmonics, a signal acquisition and conditioning circuit for converting an alternating current signal into a direct current voltage signal, and a control protection circuit for comparing the direct current voltage signal with a preset reference voltage. The system further comprises a high-voltage capacitor voltage divider, an isolation transformer and the feeder terminal unit (FTU). The application effectively solves the problem that harmonic interference, surge impact and overvoltage risk coexist in the high-voltage power-taking system, greatly improves the safety and reliability of the operation of the rear-end FTU equipment under the premise of ensuring the accuracy of voltage signal measurement and power supply continuity.

The invention discloses a reactive compensation and harmonic suppression method and device for an underground coal mine mobile substation. The method comprises the following steps: acquiring a working condition signal of load side electric equipment and a voltage signal and a current signal of a wire inlet end of the reactive compensation and harmonic suppression device; based on the voltage signal and the current signal, determining a reactive power gap value of the low-voltage side of the mobile substation and a temperature rise contribution weight of harmonic waves of each preset frequency to a cable of the low-voltage side of the mobile substation; based on the working condition signal, the reactive power gap value and the temperature rise contribution weight, a cooperative control instruction is generated and comprises a switching control instruction for a reactive compensation module in the reactive compensation and harmonic suppression device and a filtering control instruction for a harmonic suppression module in the reactive compensation and harmonic suppression device; and reactive compensation and harmonic suppression are carried out on the low-voltage side of the mobile substation. According to the invention, the accuracy and fineness of reactive compensation and harmonic suppression of the underground coal mine mobile substation are improved, so that the high-quality stable power supply requirement of an underground power grid is met.

This invention discloses a millimeter-wave broadband high harmonic suppression tripler, comprising an input matching network, a time-domain shaping tripler unit, and a differential common-source output stage. The proposed time-domain shaping tripler unit employs transistor pairs with different gate widths and bias voltages to superimpose two sets of voltage signals of different amplitudes in the time domain, thereby enhancing the inherent harmonic suppression of the tripler unit. Furthermore, by connecting a common-mode impedance control in series at the center tap of the primary inductor coil of the output transformer of the tripler unit, the output power of the third harmonic is further improved. The input matching network achieves single-ended to differential conversion, with its primary and secondary coil center taps grounded and open-circuited respectively in a counterintuitive manner, improving differential-mode balance and common-mode stability. Simultaneously, by using a series-coupled inductor, the quality factor of the transistor input impedance is reduced, improving the bandwidth performance of the tripler.

The application discloses a high-efficiency omnidirectional rectenna based on a class-F harmonic suppression structure and belongs to the rectenna field, comprising: a plurality of rectenna units which are arranged at equal intervals and rotate around the same center and are used for receiving radio frequency energy; the rectenna unit comprises a receiving antenna and a rectifier circuit; the receiving antenna comprises an antenna radiation structure, a metal floor and a feed microstrip line; a U-shaped groove is arranged on a region of the antenna radiation structure which is close to the metal floor, and a rectangular groove is arranged in the U-shaped groove; the U-shaped groove and the rectangular groove are used for suppressing the radiation of the second harmonic and the third harmonic; the rectifier circuit is arranged on the upper surface of a PCB and is used for rectifying the output signal of the antenna radiation structure by the microstrip line and electronic components; and the plurality of rectenna units are connected through a direct current synthesis network, so that the size of the rectenna can be reduced and the efficiency of the rectenna can be improved.

The application discloses a micro-grid power quality global optimization method, comprising the following steps: collecting real-time data, dividing the real-time data into several segments according to the frequency, and calculating the harmonic compensation capacity of each frequency segment according to the real-time data; according to the calculated harmonic compensation capacity, priority allocation is performed on the compensation order of the contaminated nodes in the micro-grid; the virtual impedance of the inverter and the injected damping resistance are adjusted, and the harmonic current and resonance phenomenon in the micro-grid are suppressed in the frequency segment; according to the adjusted virtual impedance and damping resistance, the node admittance matrix is updated, the compensation capacity of the inverter is monitored in real time, the real-time monitoring data is compared with the threshold value, if the threshold value is exceeded, the inverter is corrected, otherwise, no change is made. Through the frequency segment control, the pertinence and effect of harmonic suppression are improved, the frequency segment suppression of the micro-grid harmonic and high-frequency resonance is realized, the residual capacity of the inverter is dynamically matched with the harmonic compensation demand, and the safe and stable operation of the system is ensured.

The application discloses a kind of ultra-wideband high harmonic suppression power amplifier, including low-frequency power amplification branch, high-frequency power amplification branch, harmonic suppression matching network, the harmonic suppression matching network includes low-frequency harmonic suppression matching network, high-frequency harmonic suppression matching network and common output end;The low-frequency power amplification branch, high-frequency power amplification branch respectively to the frequency different low-frequency band signal, high-frequency band signal in work wideband is carried out power amplification, the low-frequency harmonic suppression matching network, high-frequency harmonic suppression matching network respectively to the impedance matching of fundamental wave in low-frequency band signal, high-frequency band signal after power amplification, while inhibiting second and third harmonic signals.The application solves the problem of low power efficiency and poor high-order harmonic suppression in the prior art.

The invention discloses a frequency quadrupler circuit, and belongs to the technical field of integrated circuits. The circuit comprises a first frequency multiplication stage and a second frequency multiplication stage which are cascaded. The core improvement is that the control ends of the third transistor and the fourth transistor in the second frequency multiplication stage are directly and electrically connected to the output nodes of the first transistor and the second transistor in the first frequency multiplication stage respectively. According to the connection mode, secondary harmonic signals which are naturally generated at two output nodes of the first-stage push-pull structure and are matched in amplitude and opposite in phase are directly used as differential input of the second stage, and therefore a necessary inter-stage transformer in the prior art is thoroughly omitted. The interstage transformer effectively solves the problems that in a traditional scheme, an interstage transformer is difficult to achieve at low frequency, the size is large, and the phase performance of differential signals is prone to being deteriorated, and has the advantages of being simplified in structure, reduced in size and better in output power and harmonic suppression performance.