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191results about How to "Lower input impedance" patented technology
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Radio frequency identification transponder antenna
ActiveUS20070052613A1Lower input impedanceLower resistanceRadiating elements structural formsAntennas earthing switches associationImpedance matchingElectric field
A RFID transponder having a microchip or integrated circuit, an impedance-matching structure and a resonant structure mounted on at least one substrate and connected to each other by an electric field.
Owner:SMARTRAC TECHNOLOGY GMBH
RF power amplifier
ActiveUS20100117737A1Lower input impedanceLow costPush-pull amplifiersPhase-splittersTransformerCoupling
A reduction is achieved in the primary-side input impedance of a transformer (voltage transformer) as an output matching circuit without involving a reduction in Q-factor. An RF power amplifier includes transistors, and a transformer as the output matching circuit. The transformer has a primary coil and a secondary coil which are magnetically coupled to each other. To the input terminals of the transistors, respective input signals are supplied. The primary coil is coupled to each of the output terminals of the transistors. From the secondary coil, an output signal is generated. The primary coil includes a first coil and a second coil which are coupled in parallel between the respective output terminals of the transistors, and each magnetically coupled to the secondary coil. By the parallel coupling of the first and second coils of the primary coil, the input impedance of the primary coil is reduced.
Owner:RENESAS ELECTRONICS CORP
Transimpedance amplifier
InactiveUS7135932B2Minimise currentWide bandwidthAmplifier combinationsAmplifiers controlled by lightAudio power amplifierEngineering
A transimpedance amplifier, which is useful as an optical fiber preamplifier, is disclosed. The illustrative embodiment exhibits four characteristics. First, it minimizes the equivalent input noise current. Second, it has a wide bandwidth. Third, it has a reasonably large output voltage, and fourth, it is stable over wide temperature and voltage ranges. The illustrative embodiment comprises a transimpedance stage and a gain stage. Both stages employ a pure NMOS design which contributes to the above four advantages. Bandwidth is further increased over the prior art by the use of inductive loads. The inductive loads of the illustrative embodiment are not physical inductors, but transistor-based “active” inductors: the combination of a resistor connected in series with the gate of an NMOS transistor.
Owner:SIRES LABS
Transconductance-enhancing passive frequency mixer
InactiveCN102412786AImprove linearityReduce power consumptionActive element networkMulti-frequency-changing modulation transferenceFrequency mixerHemt circuits
Owner:SOUTHEAST UNIV WUXI CAMPUS
Broadband multi-layer structured wave absorbing composite material and preparation thereof
InactiveCN101434134AWith electrical lossWith magnetic lossLamination ancillary operationsSynthetic resin layered productsGlass fiberSurface layer
The invention relates to a broadband wave absorption composite material with a multilayer structure and a preparation method thereof. The broadband wave absorption composite material is characterized in that the material comprises three parts, namely a surface layer, a sandwich layer and a bottom layer; the surface layer comprises, by mass percentage, 20 to 50 percent of carbonyl iron dust, 30 to 48 percent of polymer and 20 to 32 percent of fiberglass cloth; the sandwich layer comprises, by mass percentage, 2 to 6 percent of carbon nanometer tube, 56.4 to 58.8 percent of polymer and 37.6 to 39.2 percent of fiberglass cloth; and the bottom layer comprises, by mass percentage, 50 to 80 percent of carbonyl iron dust, 12 to 30 percent of polymer and 8 to 20 percent of fiberglass cloth. The broadband wave absorption composite material has the advantages of low surface density, thin thickness and high mechanical strength, and improves the bearing performance and the engineering application value.
Owner:BEIJING UNIV OF CHEM TECH
Resonator and filter
The invention discloses a resonator and a filter. The resonator comprises a substrate, a bottom electrode layer, piezoelectric layers, top electrode layers and a connecting structure, wherein the bottom electrode layer is positioned on the upper side of the substrate; the bottom electrode layer is positioned on the lower sides of the piezoelectric layers integrally or partially; the top electrode layers are positioned on the upper sides of the piezoelectric layers,; and the connecting structure is positioned outside an effective area of the resonator and is in electric contact with the bottom electrode layer and / or the top electrode layers. According to the resonator, the connecting structure is arranged additionally to be connected with at least electrode layer, so that the input impedance of the resonator can be reduced effectively to improve the performance of the resonator and the filter (a Q value of the resonator is prevented from being reduced); and the connecting structure is positioned outside the effective area of the resonator, so that the normal operation of the resonator is not influenced.
Owner:TIANJIN UNIV
Amplifier Topology for Envelope Tracking
ActiveUS20160126901A1Reduce power consumptionSmall gain changeHigh frequency amplifiersAmplifier modifications to raise efficiencyAudio power amplifierEnvelope Tracking
An amplifier (100) comprises an input port (102) for receiving an input signal, an envelope port (104) for receiving an envelope signal indicative of an envelope of the input signal. The amplifier has a first transistor (M1) and a second transistor (M2). A first biasing circuit (120) is coupled to the envelope port (104) and is arranged to generate a first bias voltage dependent on the envelope signal. A summing stage (140) is coupled to the input port (102) for receiving the input signal, coupled to the first biasing circuit (120) for receiving the first bias voltage, coupled to a gate (g) of the first transistor (M1). A second biasing circuit (130) is coupled between the envelope port (104) and a gate (g 2) of the second transistor (M2), and is arranged to generate a second bias voltage dependent on the envelope signal.
Owner:TELEFON AB LM ERICSSON (PUBL)
Low-noise preamplifier, in particular, for nuclear magnetic resonance (NMR)
ActiveUS7123090B2Lower input impedanceImprove noise figureNegative-feedback-circuit arrangementsAmplifier modifications to reduce noise influenceLow noiseTransformer
A low-noise preamplifier with an electronic amplifying element having an input (2) and an output (4), and with a first transformer (6) having a primary winding (5) and a secondary winding (8) is characterized in that the input (2) of the electronic amplifying element is the base of a transistor, the gate (G) of a field effect transistor (FET) or the grid of a vacuum tube, and the output (4) of the electronic amplifying element is the collector, the drain (D) or the anode, the output current (Ip) being passed from the electronic amplifying element through the primary winding (5) of the first transformer (6) to the output (7) of the preamplifier, wherein the secondary winding (8) of the first transformer (6) is connected to the input (2) of the electronic amplifying element. This preamplifier can be operated with extremely low noise and at any input impedance, in particular, at 50 ohms or 75 ohms.
Owner:BRUKER BIOSPIN MRI
Near field communications reader
ActiveUS20130112747A1Low antenna input impedanceImprove performanceNear-field transmissionSimultaneous aerial operationsCapacitanceAudio power amplifier
The present application relates to a near field communications (NFC) reader which includes an amplifier that drives an antenna. Capacitors of fixed value are connected in series between differential outputs of the amplifier and inputs of the antenna and form a series resonant circuit with the impedance of the antenna. Variable capacitances are provided in series with the fixed value capacitors, and the capacitance of these variable capacitances can be adjusted to compensate for manufacturing tolerances in the fixed value capacitors which cause a frequency offset between a desired resonant frequency of the series resonant circuit its actual resonant frequency, and to compensate for changes in the input impedance of the antenna that occur as the distance between the antenna of the reader and an antenna of an NFC tag changes.
Owner:QUALCOMM TECH INT
Dual-frequency receiving antenna and dual-frequency rectifying antenna
InactiveCN103474778AImprove matchHigh gainSimultaneous aerial operationsAntenna earthingsDual frequencyCircuit reliability
The invention discloses a dual-frequency receiving antenna and a dual-frequency rectifying antenna. The dual-frequency receiving antenna and the dual-frequency rectifying antenna are used for solving the problems that an existing dual-frequency receiving antenna is large in size and small in gain, an existing dual-frequency rectifying antenna is large in size, can not receive weak energy and is not suitable for remote transmission, and a rectifying circuit is poor in reliability. The dual-frequency receiving antenna comprises a rectangular radiating patch. A Z-type groove used for achieving dual-frequency characteristics is formed in the radiation patch. The lower end of the radiation patch is sequentially connected with a dielectric substrate layer and a metal earth plate through a coaxial line. The coaxial line is in circuit connection with the rear end of the radiation patch. An air dielectric layer is formed between the radiation patch and the dielectric substrate layer. The portions, arranged between the radiation patch and the dielectric substrate layer, outside the coaxial line are provided with metal sheets in a bilaterally-symmetric mode. The upper ends of the metal sheets are connected with the radiation patch. The lower ends of the metal sheets are connected with the dielectric substrate layer. One end face of the radiation patch is further connected with the metal sheets connected with the dielectric substrate layer. The dual-frequency receiving antenna and the dual-frequency rectifying antenna can be widely applied in the fields of communication, medical treatment, industry and the like, for microwave power transmission.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method for manufacturing Archimedes helical antenna
InactiveCN103956581ALower input impedanceImplement zigzag processingLogperiodic antennasRadiating elements structural formsEngineeringElectrical length
The invention discloses a method for manufacturing an Archimedes helical antenna. By means of integrated design of an index helical antenna and a sine wave meander Archimedes helical antenna and impedance conversion characteristics of the index helical antenna, high input resistance of the Archimedes helical antenna is decreased to 50 omega, the electrical length of an antenna arm can be increased by means of the meander Archimedes helical antenna, and miniaturization is achieved. When the impedance conversion ratio of two ends of a Balun of a microstrip line with indexes gradually changing is close to one, conversion between an unbalanced mode and a balanced mode can be achieved in a super broadband with a short length. A back cavity with a profile depth the same as the length of the Balun is adopted to acquire single-way radiation. By means of the method, the antenna can work within the frequency band range from 0.8GHz to 9.4GHz, the profile depth is 10mm, the aperture is 100mmm, and the aperture area is decreased by 78.62 percent compared with the traditional Archimedes helical antenna working in the same frequency band.
Owner:AIR FORCE UNIV PLA
Wireless near field communication device and power transmitter and a method for wirelessly transmitting operating power to another device
InactiveUS20160197510A1Lower input impedanceIncrease power levelNear-field transmissionElectric powerElectric power transmissionTransmitted power
The invention relates to a combined near field communication and wireless power transmitter device comprising a first antenna coupled to antenna tuning network and capable of coupling to one or more second antennae in the near field of the first antenna with coupling characteristics, means for communicating wirelessly using said first antenna with a near field communication device in a near field communication mode, and means for transmitting wirelessly power using said first antenna to another device in the vicinity of the first antenna in a power transmission mode. In power transmission mode, the antenna tuning network operates in resonance and has an initial input impedance which is configured to change if there is a change in the coupling characteristics during power transmission, for example charging. The invention also relates to a method of transmitting power to a mobile device for example for charging purposes.
Owner:TEKNOLOGIAN TUTKIMUSKESKUS VTT
Current feedback operational amplifier circuit
ActiveCN102368680ALower Offset VoltageOvercome the disadvantage of large static errorNegative-feedback-circuit arrangementsDifferential amplifiersCommon emitterCommon base
The invention discloses a current feedback operational amplifier circuit comprising a power supply, a bias current supply unit, a first common base-common emitter current mirror, a second common base-common emitter current mirror, a static bias circuit, an input buffer stage, a voltage conversion stage and a drive output unit, wherein the drive output unit comprises a bias voltage circuit and an output buffer stage; the bias current supply unit is respectively connected with the input buffer stage through the first common base-common emitter current mirror and the second common base-common emitter current mirror and used for supplying bias current; and the static bias circuit is respectively connected with the inverted input end of the input buffer stage and the voltage conversion stage and used for stabilizing a static working point of the inverted input end. The current feedback operational amplifier circuit has the advantages of lower offset voltage, stronger on-load capacity and higher conversion rate and is beneficial to improvement of the precision and the linearity of the entire operational amplifier.
Owner:FENGHUO COMM SCI & TECH CO LTD +1
RF transceiver IC having internal loopback conductor for IP2 self test
ActiveUS8606193B2Lower input impedanceMaximize power transferTelevision system detailsModulation transferenceElectrical conductorTransceiver
An RF transceiver integrated circuit has a novel segmented, low parasitic capacitance, internal loopback conductor usable for conducting IP2 self testing and / or calibration. In a first novel aspect, the transmit mixer of the transceiver is a current mode output mixer. The receive mixer is a passive mixer that has a low input impedance. In the loopback mode, the transmit mixer drives a two tone current signal to the passive mixer via the loopback conductor. In a second novel aspect, only one quadrature branch of the transmit mixer is used to generate both tones required for carrying out an IP2 test. In a third novel aspect, a first calibration test is performed using one quadrature branch of the transmit mixer at the same time that a second calibration test is performed using the other quadrature branch, thereby reducing loopback test time and power consumption.
Owner:QUALCOMM INC
Driver for semiconductor switch element
Providing a driver for semiconductor switch element capable of securing a sufficient drive power and reliably turning off the semiconductor switch element. The driver includes a converter section 2 which includes a switching element Q1 and which is configured to output a desired DC voltage by switching the switching element Q1, a control section 1 configured to control the switching operation of the switching element Q1, capacitors C1A, C1B charged by the output of the converter section 2, turn-on circuits 31A, 31B configured to supply gates of a bidirectional switch element 4 using electric charges stored in the capacitors C1A, C1B with drive powers to turn-on the bidirectional switch element 4, and turn-off circuits 32A, 32B configured to discharge the capacitors C1A, C1B to turn-off the bidirectional switch element 4 in response to the halt of the switching operation of the switching element Q1 by the control section 1.
Owner:PANASONIC CORP
Apparatus and method for transmitting and receiving high-speed differential current data between circuit devices
InactiveUS7522671B2Improve the level ofHigh transmission powerPower managementResonant long antennasDigital dataTransmitted power
An apparatus and method for an interface for transmitting high speed data between circuits. A driver circuit produces first and second differential currents from a digital signal that drive first and second transmission lines. A receiver is connected through first and second terminating resistors to said transmission lines. The resistive elements are in turn connected to first and second common base amplifiers where the differential currents are converted to a differential voltage. The input impedance to the first and second common-base amplifiers is further lowered by a differential amplifier having inputs connected to the inputs of the common-base amplifiers, and an output connected to the bases of said common-base amplifiers. As a result, voltage conversion of the differential signals takes place in the common-base amplifiers and not in the terminating resistors, reducing the level of the differential currents and permitting an increase in the digital data rate. In addition, a common-gate amplifier configuration of the present invention is provided as well as a method for dynamically determining an optimal transmit power level for the driver circuit and for performing an accelerated bit error rate measurement.
Owner:UNIVERSITY OF DELAWARE
Resonance coupling wireless power transfer receiver and transmitter
InactiveUS20130307344A1Improve input impedanceAverage power consumptionNear-field transmissionElectromagnetic wave systemElectric power transmissionResonance
Provided are a wireless power transmission receiver and a system including the same, particularly to a receiver and transmitter transmitting power from one transmitter to a plurality of receivers at the same time by wireless. According to the present invention, the wireless power receiver comprises a receiving coil unit receiving power from a transmitter by a resonance coupling method; and a power receiving unit receiving power from the receiving coil unit to provide the power to a load resistor, wherein an input impedance of the power receiving unit is adjusted according to power consumed by a plurality of receivers. Therefore, power transmission efficiency of the wireless power receiver and transmitter can be improved.
Owner:ELECTRONICS & TELECOMM RES INST
Radio frequency identification transponder antenna
ActiveUS7696947B2Lower input impedanceLower resistanceRadiating elements structural formsAntennas earthing switches associationEngineeringImpedance matching
A RFID transponder having a microchip or integrated circuit, an impedance-matching structure and a resonant structure mounted on at least one substrate and connected to each other by an electric field.
Owner:SMARTRAC TECHNOLOGY GMBH
Reduced size dielectric loaded spiral antenna
InactiveUS6975281B2Small sizeLower input impedanceSimultaneous aerial operationsAntenna supports/mountingsDielectric substrateReduced size
A spiral antenna having a pair of antenna arms mounted on a dielectric substrate. A balun is included to connect the antenna which has an impedance of 100 ohms to a 50 ohm cable. Unique features of the spiral antenna design provide for size reduction at a given lowest required frequency of operation. The spiral antenna has dielectric material layers positioned on both side of the antenna's metal arms. In addition, the antenna input impedance is reduced from the normal 100 ohm input impedance to approximately 50 ohms due the dielectric material.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
Low-noise preamplifier, in particular, for nuclear magnetic resonance (NMR)
ActiveUS20050001680A1Lower input impedanceImprove noise figureNegative-feedback-circuit arrangementsAmplifier modifications to reduce noise influenceLow noiseTransformer
A low-noise preamplifier with an electronic amplifying element having an input (2) and an output (4), and with a first transformer (6) having a primary winding (5) and a secondary winding (8) is characterized in that the input (2) of the electronic amplifying element is the base of a transistor, the gate (G) of a field effect transistor (FET) or the grid of a vacuum tube, and the output (4) of the electronic amplifying element is the collector, the drain (D) or the anode, the output current (Ip) being passed from the electronic amplifying element through the primary winding (5) of the first transformer (6) to the output (7) of the preamplifier, wherein the secondary winding (8) of the first transformer (6) is connected to the input (2) of the electronic amplifying element. This preamplifier can be operated with extremely low noise and at any input impedance, in particular, at 50 ohms or 75 ohms.
Owner:BRUKER BIOSPIN MRI
Device for Generating an Adjustable Bandgap Reference Voltage with Large Power Supply Rejection Rate
ActiveUS20120293149A1Lower input impedanceImprove the PSRR parameter.Electric variable regulationMagnetic coreVoltage reference
An adjustable bandgap reference voltage comprises means for generating current proportional to absolute temperature comprising first means connected to terminals of a core and designed to equalize voltages across the terminals, means for generating a current inversely proportional to absolute temperature connected to the core, and an output module designed to generate the reference voltage; the first processing means comprise a first amplifier possessing a stage, biased by the current inversely proportional to absolute temperature, arranged according to a folded setup and comprising first PMOS transistors arranged according to a common-gate setup, and a stage whose input is connected to the amplifier output and whose output is connected to the first stage input and to a terminal of the core, the second generating means comprise a follower amplifier setup connected to a terminal of the core and separated from the first amplifier, the output module is connected to the feedback stage.
Owner:STMICROELECTRONICS SRL
Transimpedance amplifier
InactiveUS20050007199A1Minimise currentWide bandwidthAmplifier combinationsAmplifiers controlled by lightEngineeringTransimpedance amplifier
A transimpedance amplifier, which is useful as an optical fiber preamplifier, is disclosed. The illustrative embodiment exhibits four characteristics. First, it minimizes the equivalent input noise current. Second, it has a wide bandwidth. Third, it has a reasonably large output voltage, and fourth, it is stable over wide temperature and voltage ranges. The illustrative embodiment comprises a transimpedance stage and a gain stage. Both stages employ a pure NMOS design which contributes to the above four advantages. Bandwidth is further increased over the prior art by the use of inductive loads. The inductive loads of the illustrative embodiment are not physical inductors, but transistor-based “active” inductors: the combination of a resistor connected in series with the gate of an NMOS transistor.
Owner:SIRES LABS
Wireless communication equipment
InactiveCN103441330ALower input impedanceReduce communication qualitySimultaneous aerial operationsAntenna supports/mountingsElectricityCommunication quality
The invention discloses wireless communication equipment. A first antenna and a second antenna are arranged on the wireless communication equipment. The electrical length of the first antenna is N times of that of the second antenna, and N is an integer larger than or equal to one. The first antenna and the second antenna are arranged on a printing circuit board in a common ground connection mode, namely, the first antenna and the second antenna share the same grounding point, so that the input impedance of the grounding point of the first antenna and the grounding point of the second antenna is reduced, and energy fed through the antennas is made to be distributed in a relatively even mode in the horizontal direction and the perpendicular direction of the printing circuit board. Consequently, SAR is reduced on the condition that the communication quality of the wireless communication equipment is not reduced.
Owner:HUAWEI DEVICE CO LTD
Broadband balance power amplifier based on GaN
InactiveCN104135241ALow costRealize the broadband characteristics of the power amplifierAmplifiers wit coupling networksImpedance matchingCharacteristic impedance
The invention discloses a broadband balance power amplifier based on GaN. The broadband balance power amplifier based on the GaN comprises a Lange coupler, a microstrip transmission line, a Banding metal wire, a filter inductor, a stabilizing resistor and a wide band gap GaN-based HEMT. A biasing circuit of the power amplifier comprises a T-shaped connector, the microstrip transmission line, the filter inductor, the stabilizing resistor and the GaN-based HEMT, the GaN-based HEMT (H) is an HEMT pipe core with the type of NRF01-02a, and a four-line 3dB coupling Lange coupler with the characteristic impedance of 50 ohms is selected and used as the Lange coupler. The broadband balance power amplifier based on the GaN is simple in structure and low in cost, the Lange coupler is adopted for constructing the structure of the balance power amplifier, a multi-section impedance matching technology is adopted for designing an input / output matching network, the power amplifier broadband characteristics are achieved, and within the 115-315 GHz frequency band, the power amplifier linear gain is larger than 12 dB, and the saturation output power is larger than 8 W.
Owner:WUXI YANAO ELECTRONICS TECH
Reading device and method for measuring energy and flight time using silicon photomultipliers
ActiveUS20150309192A1Good timing accuracyDecrease amount of dataMaterial analysis by optical meansRadiation intensity measurementPhysicsSignal-to-noise ratio (imaging)
This invention is about a readout apparatus and method for time-of-flight and energy measurements with silicon photomultipliers (SIPM) coupled to a scintillator. The timing measurement can be as accurate as 50 ps or below, after calibration. The energy is measured using a time-over-threshold technique, and the energy resolution is only constrained by the scintillation statistics. In order to achieve low power of 10 mW per channel, a low impedance input amplifier and analogue time-to-digital converters (TDCs) based on time interpolation are used. The readout circuit can be triggered by a single photoelectron (p.c.) with a signal-to-noise ratio (SNR) above 20 dB. The said readout circuit operates with SiPMs of different gain, polarity and matrix size. The preferred embodiment of the readout apparatus is a multi-channel application specific integrated circuit (ASIC) with 64 channels.
Owner:PETSYS - MEDICAL PET IMAGING SYST
Coplanar coupled-fed multiband antenna for the mobile device
ActiveUS7932865B2Increase capacityReduce inductive reactanceSimultaneous aerial operationsAntenna supports/mountingsDielectric substrateGround plane
The present invention is related to a coplanar coupled-fed multiband antenna for the mobile communication device. The antenna mainly comprises a dielectric substrate, a ground plane located on one surface of the dielectric substrate, and a radiating portion, a shorting metal portion, and a feeding portion, which are all on the same surface of the dielectric substrate near one edge of the ground plane. One end of the shorting metal portion is connected to the radiating portion, and the other end is connected to the ground plane. The feeding portion comprises a first feeding metal portion and a second feeding metal portion. The first feeding metal portion has a feeding point for the antenna. One end of the second feeding metal portion is connected to the radiating portion, and there is a gap between the second feeding metal portion and the first feeding metal portion.
Owner:ACER INC
Power device with high switching speed and manufacturing method thereof
ActiveUS20070090415A1Voltage can drop so lowHigh input impedanceSemiconductor/solid-state device manufacturingSemiconductor devicesMOSFETThyratron
A power device is formed by a thyristor and by a MOSFET transistors, series-connected between a first and a second current-conduction terminal. The power device moreover has a control terminal connected to an insulated-gate electrode of the MOSFET transistor and receiving a control voltage for turning on / off the device, and a third current-conduction terminal connected to the thyristor for fast extraction of charges during turning-off. Thereby, upon turning off, there are no current tails, and turning off is very fast. The power device does not have parasitic components and consequently has a very high reverse-bias safe-operating area.
Owner:STMICROELECTRONICS SRL
Reading circuit based on relaxor ferroelectric monocrystal pyroelectric detector
InactiveCN101806630AEffective readoutStable biasPyrometry using electric radation detectorsPyroelectric detectorsControl signal
The invention relates to a reading circuit based on relaxor ferroelectric monocrystal pyroelectricity, which can realize the outputting of a relaxor ferroelectric monocrystal pyroelectric signal. The output current signal of the relaxor ferroelectric detector is converted into a voltage signal through an CTIA input-stage circuit module, the voltage signal is output after amplification, a double sampling hold circuit samples the signal twice, and a multichannel transmission circuit outputs the signals in each channel after conduction. The circuit modules are integrated on an integrated circuit chip and connected with a detector chip, and the control signal of the circuit modules is provided by an external drive circuit, thus the integrated circuit chip can effectively read the signal of the relaxor ferroelectric detector.
Owner:NANTONG UNIVERSITY
Crossover for multi-driver loudspeakers
ActiveUS10701487B1Reduce input impedanceReduce designFrequency response correctionLoudspeaker signals distributionLoudspeakerEngineering
Crossover networks modified to render audible colorations or frequency / phase emphases observed in some crossover networks of the prior art. Circuit topologies of prior art crossover networks are modified such that an additional pole appears in the transfer functions of one or more low-frequency pass crossover filters. In addition, the characteristic input impedance of one branch of the modified crossover network is reduced, typically to a value of approximately one-half the design characteristic impedance of the unmodified crossover networks.
Owner:MODAFFERI RICHARD
Miniature measurement and control system fit for high-field asymmetric waveform transference tube
InactiveCN102636555AReduce noiseUltra-Low Input Bias CurrentMaterial analysis by electric/magnetic meansLow noiseControl system
The invention discloses a miniature measurement and control system fit for a high-field asymmetric waveform transference tube. The system comprises a man-machine interaction module, an upper computer system and a measurement and control circuit module, wherein the measurement and control circuit module comprises a plurality of sub-circuit modules; an operator sends an operation command and observes a detection result through a friendly instrument operation interface provided by the upper computer system and the man-machine interaction module; the upper computer system is connected with the sub-circuit modules in the measurement and control circuit module; and the sub-circuit modules are connected with corresponding components in the high-field asymmetric waveform transference tube to generate measuring signals necessary for detecting substance ingredients of the high-field asymmetric waveform transference tube and detect a signal output by the high-field asymmetric waveform transference tube at high precision. The miniature measurement and control system provided by the invention is fit for high-field asymmetric waveform transference tubes with different sizes and manufactured by various techniques, and the system has the advantages of low noise, high integration degree, good reliability and anti-interference capability, and quick and simple operation, and the like.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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