67results about How to "Increased operating frequency range" patented technology

A variable frequency converter and an adjusting method for the same are provided in the present application. The variable frequency converter operates in a variable frequency mode, and comprises a power stage circuit module and a variable frequency signal stage circuit module which are connected to form a closed-loop circuit system. The variable frequency converter further comprises an adjusting unit outputting a continuous interfering signal and loading the continuous interfering signal into the variable frequency signal stage circuit module so as to cause operating frequency of the power stage circuit module controlled by the variable frequency signal stage circuit module to change continuously. In the present application, in the variable frequency converter, the EMI peak value is decreased.

Disclosed is a resonant device applied in vibration test. The device comprises an additive working table fixed on the surface of a vibration table or a bounce table. The main body of the additive working table is a rigid table, which top surface is the additive table for setting testing component; around the bottom of the table are equipped with mounting pads, the middle part of the table is hung in the air relative to the mounting pad plane; the natural first resonance frequency or multiple resonance frequency of the rigid table is greater than the natural resonance frequency of the vibration table or the bounce table. The invention has the advantages that it can improve the range of testing frequency by installing resonance device.

The invention relates to a microwave millimeter wave low-phase-different wide-frequency digit attenuation integral circuit, wherein it is formed by one or more attenuation integral circuits; said circuit is formed by two wide-band single-pole double-throw switches, reference micro band, resistance attenuation network, input / output and two controllers; the controller functions right signal on two single-pole double-throw switches, the reference micro band will be connected or stopped, and the attenuation network will be stopped or connected; two branches outputs signal with fixed attenuation values and fixed phase. The invention has simple structure and wide work frequency, etc.

A miniaturized wideband surface mount bias tee comprises a printed circuit board with a functioning first capacitor and a dummy second capacitor, and an inductor bonded atop the two capacitors. The capacitors, adhesive and solder are depositable by standard surface mount pick and place machinery. The inductor wires are bonded to one of the first capacitor bonding pads and to an inductor bonding pad. The circuit element bonding pads include portions bordering the pc board edges and are conductively connected to bonding pads on the bottom face of the pc board. Conductive thru-vias for the first capacitor bonding pads reduce parasitic inductance and extend the operating frequency range. A flat-topped insulating cap encloses the bias tee sides and top. The cap forms an air gap between the inductor and circuit elements and provides a surface for manipulating the bias tee with present-day assembly equipment.

The invention discloses a decimal and integer frequency divider circuit and an implementation method of the decimal and integer frequency divider circuit. The decimal and integer frequency divider circuit comprises an orthogonal clock generation module, a pulse swallowing circuit, a divide-by-2 divider, a mode control module and a clock selection module. The method includes the steps that firstly, an initial clock generates two pairs of difference clock signals which are orthogonal through the orthogonal clock generation module; secondly, a MODE signal generates a pulse swallowing control signal through the mode control module, and the number of pulse swallowing times is determined; thirdly, the clock selection module selects an output clock. According to the decimal and integer frequency divider circuit, the frequency division of different integer and decimal frequency division factors can be achieved by programming the MODE control signal and the clock selection signal, and the decimal and integer frequency divider circuit has the advantages of being high in frequency resolution, wide in frequency division factor range and high in module repeated utilization rate. The frequency divider is suitable for the field of programmable decimal frequency division phase-locked loop design, frequency synthesizer design and other clock system design.

The invention discloses a two-waveband radio frequency (RF) optical transmission module, comprising a first directional coupler, a down converter, a first filtering module, an analog-to-digital (AD) conversion module, a first baseband processor, a first photoelectric conversion module, a wavelength division multiplexer (WDM), a second photoelectric conversion module, a second baseband processor, a digital-to-analogue (DA) conversion module, a second filtering module, an up converter, a cascade amplifying module, a third filtering module, a second directional coupler and a module monitoring unit. The optical transmission module not only has the advantages of common optical modules, but also has the capability of working in the two-waveband range, thus broadening the range of working efficiency, and solving the problem of resource waste for networking repeatedly. The optical transmission module is used for converting uplink and downlink RF signals into I / Q digital signals by AD conversion in the process of signal transmission, and then the I / Q digital signals are transmitted in the form of frame format in optical fibers by a laser, thereby greatly improving the stability of the signals in the transmission process.

The invention discloses a radio-frequency power device with adjustable operating frequency, comprising an input prematching network, a power amplifier module and an output pre-matching network which are connected in sequence; the capacitance or inductance value of the input prematching network, the output pre-matching network and the power amplifier module are not fixed and can be adjusted and controlled. By changing the capacitance or inductance value, the work frequency of the power device can be changed, and the range of the work frequency of the input prematching network and the output pre-matching network can be extended accordingly, thus the work range of the radio-frequency power device can be extended, the design process complexity and cost of the radio-frequency power device are reduced, and the radio-frequency power device can work in the occasions needing various different work frequency.

The invention is generally directed towards monitoring of a signal (M), such as a clock signal or a data signal, by sampling the signal to obtain a discrete sample representation of the signal and analyzing the sample representation. The idea according to the invention is to slide a sample window (SW) over the sampled signal and determine whether the samples currently within the window include a valid transition sequence. In the general case, the existence of a valide signal is confirmed as long as a valid transition sequence is present in at least one of a predetermined number of consecutive sample windows. In order to reduce the need for oversampling in high-frequency applications, the invention furthermore proposes a multi-phase sampling technique according to which a number of phase-shifted sample clocks (S1 to SN) are generated for the purpose of sampling the signal to be monitored. Higher-frequency oversampling is thus replace by a higher resolution in the time domain.

The present invention relates to a high-frequency broadband voltage-controlled oscillator and an operation method thereof. The high-frequency broadband voltage-controlled oscillator comprises an inputbuffer unit, a resonance unit, an output buffer unit, a negative resistance unit and a tail current source unit. The operation method comprises the steps of accessing a control voltage to the input buffer unit, and transmitting a voltage signal to the resonance unit; generating an oscillating signal according to the voltage signal by the resonance unit, and transmitting the oscillating signal tothe output buffer unit; buffering the oscillating signal by the output buffer unit and outputting the oscillating signal; compensating the loss of the resonance unit by the energy of the negative resistance generated by the negative resistance unit; and generating a working current by the tail current source unit. In this way, the secondary harmonic component of the current generated in the resonance circuit is prevented from entering the ground, and the even harmonic and the surrounding noise are inhibited. Compared with the prior art, the oscillation frequency and the output amplitude are improved, and the phase noise and the even harmonic noise are reduced. The precision of a current source is improved and the performance requirements of a millimeter wave frequency band signal source are met.

The invention relates to an adjustable polarization converter and an electronic device. The adjustable polarization converter comprises a first substrate, a second substrate and a liquid crystal layerarranged between the first substrate and the second substrate. The first substrate comprises a first base substrate and a first electrode arranged on the first base substrate; and the second substrate comprises a second base substrate and a second electrode arranged on the second base substrate. The first electrode comprises a conductive border and two triangular conductive patches; the conductive border comprises two notches sequentially formed; and two triangular conductive patches are arranged in a region surrounded by the conductive border and are centrally symmetric. The adjustable polarization converter can implement polarization conversion on an incident electromagnetic wave under a relatively high frequency, and has the advantages of simple structure, high response speed, high working frequency, large working frequency range and the like.

An object-positioning device comprises a rod-like object holder inserted in the chamber of a charged-particle beam system for moving the object outside the chamber, a support for slideably supporting at least a part of the side surface of the object holder, thus making the rear end of the holder outside the chamber a free end, and a vibration-absorbing portion mounted on the rear end of the object holder. The vibration-absorbing portion has an operating range in which vibrational frequencies in a translational direction perpendicular to the longitudinal direction of the object holder are absorbed. The natural vibrational frequency of the object holder in the bending mode is included within the operating range of the vibration-absorbing portion.

The invention provides a high-frequency low-power-consumption true logarithmic amplifier. The high-frequency low-power-consumption true logarithmic amplifier comprises a power divider circuit, an attenuator, a logarithmic detector amplifying circuit, a slope adjusting circuit, an amplitude limiting amplifying circuit, a match circuit and an amplitude conditioning circuit, wherein input signals aredivided by the power divider circuit into two ways to transmit the input signals to the attenuator and the amplitude limiting amplifying circuit; the input signals are attenuated through the attenuator to adjust initial points of logarithmic detectors; the input signals after attenuation are subjected to detector amplification processing through the logarithmic detector amplifying circuit to output video signals with the logarithmic relationship with input signal amplitude; the slope of the video signals is adjusted through the slope adjusting circuit, and the video signals after adjustment are transmitted to an amplitude conditioning circuit; the amplitude limiting amplifying circuit carries out amplitude limiting amplifying processing on the input signals; the input signals after amplitude limiting amplifying processing are matched and output to the amplitude conditioning circuit; the amplitude conditioning circuit carries out amplitude adjustment on the input signals after amplitude limiting amplifying processing according to the change rule of the video signals after adjustment, and radio-frequency signals changed according to the logarithm rule are output. The true logarithmic amplifier is high in working frequency, low in power consumption and small in area.

The invention discloses a TSPC flip-flop with a set function, comprising: six PMOS transistors and eight NMOS transistors, wherein the drain of the seventh NMOS transistor is connected to a node Z, the source thereof is grounded, and the gate thereof inputs a signal SET. The seventh NMOS transistor functions both as a circuit set function device and as leakage compensation, and plays an importantrole in increasing the operating frequency range of the circuit. The TSPC flip-flop can increase the operating frequency range of the trigger and reduce the occupied layout area.

A low voltage differential signal (LVDS) driving circuit and a digital signal transmitter with the LVDS driving circuit are provided. The LVDS driving circuit includes a positive differential output terminal and a negative differential output terminal and a transition accelerator. A differential output signal is provided by the positive and negative differential output terminals. When the differential output signal transits from low to high, the transition accelerator couples the positive differential output terminal to a high voltage source and couples the negative differential output terminal to a low voltage source. When the differential output signal transits from high to low, the transition accelerator couples the positive differential output terminal to the low voltage source and couples the positive output terminal to the high voltage source.

The invention provides a low-power consumption, high-resolution and all-digital phase-locked loop structure. The low-power consumption, high-resolution and all-digital phase-locked loop structure includes a digital circuit part which comprises at least one numerically-controlled oscillator module, and a logic circuit part which comprises a phase discriminator module, an all-digital phase-locked loop controller module and a frequency dividing module. According to the low-power consumption, high-resolution and all-digital phase-locked loop structure, the numerically-controlled oscillator of a coarse adjustment-and-fine adjustment cascade framework structure is adopted, and therefore, an operating frequency range can be extended, and high accuracy can be maintained; and a plurality of segmented time-delay links form a coarse adjustment part, and therefore, power consumption can be decreased.

A low voltage differential signal (LVDS) driving circuit and a digital signal transmitter with the LVDS driving circuit are provided. The LVDS driving circuit includes a positive differential output terminal and a negative differential output terminal and a transition accelerator. A differential output signal is provided by the positive and negative differential output terminals. When the differential output signal transits from low to high, the transition accelerator couples the positive differential output terminal to a high voltage source and couples the negative differential output terminal to a low voltage source. When the differential output signal transits from high to low, the transition accelerator couples the positive differential output terminal to the low voltage source and couples the positive output terminal to the high voltage source.

A delay cell has selectable numbers of parallel load resistance transistors operable in parallel, and a similarly selectable number of bias current transistors connectable in parallel. The delay cell is preferably differential in construction and operation. A voltage controlled oscillator (“VCO”) includes a plurality of such delay cells connected in a closed loop series. Phase locked loop (“PLL”) circuitry includes such a VCO controlled by phase / frequency detector circuitry. The PLL can have a very wide range of operating frequencies as a result of the ability to control the number of load resistance transistors and bias current transistors that are active or inactive in each delay cell. Such activation / deactivation may be programmable or otherwise controlled.

A delay cell has selectable numbers of parallel load resistance transistors operable in parallel, and a similarly selectable number of bias current transistors connectable in parallel. The delay cell is preferably differential in construction and operation. A voltage controlled oscillator (“VCO”) includes a plurality of such delay cells connected in a closed loop series. Phase locked loop (“PLL”) circuitry includes such a VCO controlled by phase / frequency detector circuitry. The PLL can have a very wide range of operating frequencies as a result of the ability to control the number of load resistance transistors and bias current transistors that are active or inactive in each delay cell. Such activation / deactivation may be programmable or otherwise controlled.

The invention discloses an electromagnetic radiation device based on a planar transmission line structure. The electromagnetic radiation device comprises a shield plate, a printed circuit board assembly and radio frequency interconnection assemblies, wherein a groove extending in the length direction and at least one through hole penetrating the groove are formed in the shield plate; the printed circuit board assembly comprises a dielectric substrate, a central metal band and upper grounding metal bands; the dielectric substrate is attached to the upper surface of the shield plate, and viewing ports corresponding to the through holes are formed in the dielectric substrate; the central metal band is laid on the upper surface of the dielectric substrate and extends in the length direction of the dielectric substrate; the upper grounding metal bands are laid on the upper surface of the dielectric substrate and located on two sides of the central metal band; the radio frequency interconnection assemblies are mounted at two ends of the shield plate to transmit electromagnetic waves to the central metal band. With adoption of the electromagnetic radiation device provided by the embodiment of the invention, convenience in biological experiment operation in an irradiation process is realized, and the electromagnetic radiation device has the electromagnetic properties of large single-mode operation frequency range, high power efficiency and the like and is simple to process and manufacture.

Provided is an improved low-voltage ride-through control system. A novel flux observer is used to control the rotor side, and an active crowbar protection circuit and low-voltage ride-through reactivepower compensation are combined. When the grid voltage drops, the over-current and over-voltage on the rotor side and on the stator side will damage power devices and affect the stable operation of the system. The control by the novel flux observer works in a current mode at low frequency and works in a voltage mode at high frequency, which increases the operation frequency of a doubly fed induction motor. The novel observer contains an adaptive speed observer, which can improve the accuracy of rotor flux voltage and enhance the robustness of the system. The crowbar protection circuit is usedto solve the low-voltage ride-through problem of a doubly fed wind power generation system in case of grid fault. By employing a thyristor switched capacitor (TSC) circuit, the reactive power demandproblem of the doubly fed induction motor during asynchronous operation is solved.

The invention discloses a multi-band linear frequency modulation signal generation method capable of flexibly selecting frequencies, and relates to the technical field of microwaves and the technical field of optical communication. The method is shown in a figure 1 in the specification, and comprises a laser device LD, a dual-polarization binary phase shift keying modulator DP-BPSK, an arbitrary waveform generator AWG, an erbium-doped fiber amplifier EDFA, a polarization controller PC, a polarizer POL and a photoelectric detector PD. Phase modulation is carried out on a local oscillator signal through the DD-MZM1 of the DP-BPSK upper arm, and carrier suppression double-sideband modulation is carried out on an IF-LFM signal through the DD-MZM2 of the DP-BPSK lower arm; the PC is adjusted, the phase difference between the two polarization states is controlled, and then a multiband linear frequency modulation signal can be obtained after POL and photoelectric detection. According to the invention, the electronic bottleneck of the electric field technology is overcome, and the characteristic of flexible frequency tuning is added; multi-band signals are generated at the same time, so that the system has potential application value in a multi-band radar and a distributed radar system.

The invention discloses a two-dimensional compliant vibration platform with wedge pre-tightening. The platform includes driving sources, a compliant vibration platform, a base and wedge pre-tighteningdevices. The compliant vibration platform includes arc type flexible hinges, outer straight beam type flexible hinges, a work table, inner straight beam type flexible hinges and a compliant vibrationplatform outer frame. When the driving sources in two directions move at the same time, the work table generates mechanical vibration in two directions so as to realize two-dimensional vibration assisted processing. The driving sources provide micron-level vibration for the work table through the arc type flexible hinges. The outer straight beam type flexible hinges and the inner straight beam type flexible hinges are arranged symmetrically about the work table so as to realize the decoupling motion of the work table and provide guarantee for the high precision motion of the vibration platform. The vibration platform uses the wedge pre-tightening devices, and so the adjustment is more intuitive and the pre-tightening force is even. The driving sources of different types and sizes are pre-tightened by adjusting the position of pre-tightening screws, and so the adaptability is strong.

The invention provides a true random number generating device and generating method. The generating device comprises a control module, a random number generating module and a random number reading module. The random number generation module comprises a spin orbital moment layer and a plurality of magnetic tunnel junctions arranged on the spin orbital moment layer. The control module is used for forming a random number generation signal based on a random number generation instruction of a user; the random number reading module is used for inputting a preset signal to the two magnetic tunnel junctions based on the random number generation signal transmitted by the control module and obtaining a random number output signal based on the discharge condition of the preset signal. According to the invention, the problems of high hardware overhead, limited working frequency and high power consumption of a true random number generator in the prior art can be solved.

The invention discloses a novel plasma antenna and a usage method thereof. The novel plasma antenna comprises a discharging room, a gas cylinder, a radio-frequency power supply, a glass tube and an alternating-current power supply. Plasma is caused in the discharging room; the plasma enters the glass tube to work to form a plasma antenna and thus realize signal receiving and transmitting. A plasma generation zone and a plasma working zone are separated and work independently, so that the density of the plasma in the plasma working zone can be adjusted and thus the working frequency range of the plasma antenna can be increased.

The invention discloses a measurement and analysis device applicable to electrochemical systems with different impedances. An operator only needs to control a first controllable relay and a second controllable relay, so that the measurement and analysis device can be switched between two working conditions, the measurement and analysis device can be applicable to the electrochemical systems with different impedances at the same time, a thinking set that impedance measurement is performed in a working way of using a constant potential instrument only in the prior art is broken through, and working efficiency of measurement is greatly improved; meanwhile, a digital signal processing unit is used for performing impedance calculation, so that the measurement and analysis device disclosed by the invention has the characteristics of large working frequency range, high calculation speed and high measurement accuracy.

The invention discloses a TSPC trigger with a setting reset function, the trigger is composed of seven PMOS transistors, ten NMOS transistors, two inverters and an NAND gate, and by setting a settingsignal and a reset signal, the trigger has three modes: a common mode, a setting mode and a reset mode. Compared with a traditional static logic D trigger with a setting reset function, the TSPC trigger provided by the invention has the advantages that the working frequency of the trigger is high; and compared with a TSPC trigger only having a setting function and a TSPC trigger only having a resetting function, the trigger has the setting function and the resetting function at the same time, the use flexibility of the TSPC is improved, the structure is simple, and the implementation complexity is low.

The invention provides a component communication device, which comprises a shell body, an orthogonal mode converter and a plurality of waveguide circulators, wherein the orthogonal mode converter andthe plurality of waveguide circulators are arranged in the shell body, the orthogonal mode converter is arranged in the middle of the shell body, and the orthogonal mode converter is connected with the plurality of waveguide circulators. According to the component communication device, the orthogonal mode converter and the plurality of waveguide circulators are integrated on the shell body, the advantages of wide working frequency ranges of the orthogonal mode converter and the waveguide circulators are combined, the component communication device is applied to a microwave relay transmission communication system, so that the working frequency band of the whole machine is wide, the system can work in a specific circular waveguide state through the used orthogonal mode converter, isolation between a receiving path and a transmitting path is realized without mutual influence, the transmission loss is reduced, the integration of components is improved, the size of the components is reduced, and the space occupancy rate of the component communication device is reduced.

The invention relates to a rotor inertia type anti-side-rolling-force vibration absorber for a railway vehicle. The vibration absorber is fixedly connected with a vehicle body chassis of the railway vehicle and is arranged in the width direction of the vehicle, and the vibration absorber comprises a U-shaped bearing frame, a balancing frame which relatively and horizontally rotates in the bearing frame through a balancing shaft, and a rotor unit which is relatively and vertically electrically driven to rotate in the balancing frame. Compared with the prior art, the vibration absorber has the advantages of being simple in structure, easy to control, high in reliability, capable of effectively enhancing the side rolling resistance of the railway vehicle, wide in working frequency domain, wide in application and the like.

The invention provides a preparation method and structure of a series superconducting quantum interference device array based on a superconducting bridge junction. The series superconducting quantum interference device array structure based on the superconducting bridge junction has a nano-bridge structure, and a plurality of SQUID arrays connected in series are formed. Therefore, the structure has the characteristics of high junction current density and small parasitic capacitance. Through the series superconducting quantum interference device array structure with nanojunctions, the structurecan be reduced to the nanoscale, and the ability to resist external magnetic field interference is higher. Through the series SQUID array, the whole system of the series superconducting quantum interference device array structure based on the superconducting bridge junction has a larger bandwidth, the impedance matching problem is avoided, and the working frequency range is greatly increased. Therefore, the prepared series superconducting quantum interference device array structure based on the superconducting bridge junction has stronger anti-interference capability, higher bandwidth and better output signal-to-noise ratio.