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 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 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 S_N) 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.

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.

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.

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 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 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.