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107 results about "Transmission line transformer" patented technology
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Circuit for parallel operation of Doherty amplifiers
InactiveUS7262656B2Prevent a band from being narrowedReduce transmission lossAmplifier modifications to raise efficiencyAmplifier combinationsAudio power amplifierTransmission line transformer
A circuit is disclosed for operating Doherty amplifiers in parallel in a small size circuit and at a low cost while reducing transmission loss and preventing a narrowed band. The circuit has a plurality of Doherty amplifiers and a signal combiner. Each of the plurality of Doherty amplifiers is applied with a distributed input signal which is amplified and delivered by the Doherty amplifier. The signal combiner is made up of a transmission line transformer, is connected to the outputs of the Doherty amplifiers and to its output terminal. The signal combiner has an impedance as viewed from the Doherty amplifiers, which represents an optimal load for the Doherty amplifiers, and an impedance as viewed from the output terminal, which is equal to the characteristic impedance of a transmission line connected to the output terminal. The signal combiner combines the outputs of the Doherty amplifiers and delivers the resulting output from the output terminal.
Owner:NEC CORP
Circuit for parallel operation of Doherty amplifiers
InactiveUS20060044060A1Prevent a band from being narrowedReduce transmission lossAmplifier modifications to raise efficiencyAmplifier combinationsAudio power amplifierTransmission line transformer
A circuit is disclosed for operating Doherty amplifiers in parallel in a small size circuit and at a low cost while reducing transmission loss and preventing a narrowed band. The circuit has a plurality of Doherty amplifiers and a signal combiner. Each of the plurality of Doherty amplifiers is applied with a distributed input signal which is amplified and delivered by the Doherty amplifier. The signal combiner is made up of a transmission line transformer, is connected to the outputs of the Doherty amplifiers and to its output terminal. The signal combiner has an impedance as viewed from the Doherty amplifiers, which represents an optimal load for the Doherty amplifiers, and an impedance as viewed from the output terminal, which is equal to the characteristic impedance of a transmission line connected to the output terminal. The signal combiner combines the outputs of the Doherty amplifiers and delivers the resulting output from the output terminal.
Owner:NEC CORP
RF amplifying device
ActiveUS20090085666A1Large current carrying capacityHigh quality factorAmplifier combinationsAmplifiers wit coupling networksTransmission line transformerEnergy coupling
When an output electrode of a power transistor in the final amplifying stage is coupled to a transmission line transformer TLT serving as an impedance matching circuit, a condition for impedance matching of the transmission line transformer is maintained. An RF amplifying device comprises a transmission line transformer coupled to an output electrode of a power transistor for generating transmission power to be fed to an antenna. The transmission power from the output electrode of the power transistor is fed to one end of a main line of the transmission line transformer, and one end of a secondary line of the transmission line transformer is coupled to an AC grounding node. The other end of the secondary line is coupled to the one end of the main line, thereby generating the transmission power to be fed to the antenna from the other end of the main line. At an energy coupling part where the main line of the transmission line transformer is in close proximity of, and opposite to the secondary line, coupling energy is transmitted from the secondary line to the main line. Coupling members electrically coupled to the output electrode of the power transistor are electrically coupled to a joint formed in either the main line, or the secondary line, at part of the energy coupling part.
Owner:RENESAS ELECTRONICS CORP
RF amplification device
InactiveUS20100090767A1Increase the areaGated amplifiersAmplifier combinationsLoad circuitTransmission line transformer
An RF amplification device has amplification elements which amplify a radio frequency input signal in wireless radio communication. Transmission line transformers are coupled to one of an input electrode and an output electrode of the amplification elements and have a main line Lout arranged between the input and the output, and a sub line Lin1 arranged between an AC ground point and one of the input and the output and coupled to the main line Lout. By applying an operating voltage different from the ground voltage level to the AC ground point, the operating voltage is supplied to the output electrodes of the amplification elements via the sub line from the AC ground point. In realizing a high-performance load circuit in an RF amplification device, it is possible to avoid increase of a module height of an RF module.
Owner:RENESAS ELECTRONICS CORP
Broadband monopole/ dipole antenna with parallel inductor-resistor load circuits and matching networks
InactiveUS6919851B2Easy constructionImprove bandwidth performanceSimultaneous aerial operationsElongated active element feedLoad circuitLow voltage
A broadband loaded antenna and matching network with related methods for design optimization are disclosed. The loaded antenna structures may preferably be either monopole or dipole antennas, but the particular methods and techniques presented herein may be applied to additional antenna configurations. The load circuits positioned along an antenna may comprise parallel inductor-resistor configurations or other combinations of passive circuit elements. A matching network for connecting an antenna to a transmission line or other medium preferably includes at least a transmission line transformer and a parallel inductor. Various optimization techniques are presented to optimize the design of such broadband monopole antennas. These techniques include implementation of simple genetic algorithms (GAs) or micro-GAs. Component modeling for selected components may be effected through either lumped element representation or curved wire representation. Measured results are presented to ensure that certain design criteria are met, including low voltage standing wave ratio (VSWR) and high gain over a desired frequency band.
Owner:CLEMSON UNIVERSITY
Active broadband matching method of short-wave frequency-band electrically small antenna and matching circuit thereof
InactiveCN104202007AGood offsetting effectMultiple-port networksTransmissionCapacitanceTransmission line transformer
The invention discloses an active broadband matching method of a short-wave frequency-band electrically small antenna and a matching circuit thereof, the electrically small antenna is matched by a non-Forster reactive element and a passive broadband matching network, the non-Forster reactive element is realized by a negative impedance converter, the negative impedance converter and the passive broadband matching network are cascaded into an active broadband matching network with two ports, one port of the matching network is connected with the electrically small antenna, and said two ports are connected with an emitter / receiver. In the invention, the non-Forster reactive element and the passive broadband matching network are comprehensively considered, led loss is regulated in realization process of the non-Forster reactive element, single traditional negative capacitor can be replaced by in series connecting a negative capacitor and a negative inductor to better neutralize the impedance imaginary part, a transmission line transformer is led into the matching network, and the deviation between a testing value and a design value can be compensated by slightly adjusting the transformation ratio of the transmission line transformer.
Owner:XIDIAN UNIV
High-impedance dc-isolating transmission line transformers
ActiveUS20110279209A1Multiple-port networksOne-port networksTransmission line transformerEngineering
A composite transmission line transformer includes at least one core, a first port, a second port, and one or more pairs of transmission lines wound about the core(s). Each transmission line is in signal communication with the first port and the second port. For each pair, the transmission lines are interconnected in series at the first port and at the second port such that the first port and the second port are DC-isolated from each other.
Owner:AGILENT TECH INC
Transmission line transformer
ActiveUS20060232355A1Improve dynamic rangeImprove efficiencyMultiple-port networksOne-port networksAudio power amplifierTransmission line transformer
A transmission line transformer is disclosed. The transformer improves efficiency and a dynamic range of a power amplifier. The transformer is formed to have a plurality of load impedances as the primary side of the transmission line transformer is separated to form a plurality of primary transmission lines with parasitic components which are different from each other. The transformer is used as an impedance matching circuit of the power amplifier requiring a plurality of load impedances.
Owner:KOREA ADVANCED INST OF SCI & TECH
High-impedance DC-isolating transmission line transformers
A composite transmission line transformer includes at least one core, a first port, a second port, and one or more pairs of transmission lines wound about the core(s). Each transmission line is in signal communication with the first port and the second port. For each pair, the transmission lines are interconnected in series at the first port and at the second port such that the first port and the second port are DC-isolated from each other.
Owner:AGILENT TECH INC
RF amplifying device
ActiveUS7825731B2Large capacityHigh quality factorAmplifier combinationsAmplifiers wit coupling networksTransmission line transformerEnergy coupling
An RF amplifying device includes a transmission line transformer coupled to an output electrode of a power transistor for generating transmission power to be fed to an antenna. The transmission power from the output electrode of the power transistor is fed to one end of a main line of the transmission line transformer, and one end of a secondary line of the transmission line transformer is coupled to an AC grounding node. The other end of the secondary line is coupled to the one end of the main line, thereby generating the transmission power. Coupling energy is transmitted from the secondary line to the main line. Coupling members electrically coupled to the output electrode of the power transistor are electrically coupled to a joint formed in either the main line, or the secondary line, at part of the energy coupling part.
Owner:RENESAS ELECTRONICS CORP
Combiner for an RF power amplifier
ActiveUS20140232483A1Scalable and configurableHigh frequency amplifiersSolid-state devicesDielectricCoaxial cable
Embodiments of the invention include a combiner for an RF amplifier comprising wiring and a transmission line transformer. The transmission line transformer may include a ferrite core having a hole defined therein; a coaxial cable having a first dielectric constant and routed through the hole of the ferrite core; and a stripline having a second dielectric constant and routed around the ferrite core. In some embodiments, an electrical length of the stripline is matched to an electrical length of the coaxial cable. The electrical length of the coaxial cable may be defined by the first dielectric constant and the electrical length of the stripline may be defined by the second dielectric constant.
Owner:EMPOWER RF SYST
High-precision zero drift compensation circuit for analog multiplier
InactiveCN102497193AHigh precisionReduce the impactReliability increasing modificationsTransmission line transformerEngineering
The invention discloses a high-precision zero drift compensation circuit for an analog multiplier. The influence of zero drift on the analog multiplier is compensated. The high-precision zero drift compensation circuit comprises the analog multiplier, a transmission line transformer, a reference power supply, a zeroing resistor, a grounding resistor and a temperature sensor, wherein the transmission line transformer is connected to the input end of the analog multiplier, and is used for reducing the influence of biasing current at the input end on the analog multiplier; and fixed voltage is applied to the zeroing end of the multiplier through the reference power supply, the zeroing resistor and the grounding resistor in a voltage share manner to compensate the biasing voltage at the output end. The grounding resistor with a low resistance value is used for reducing the influence of the biasing current at the zeroing end on the analog multiplier; and compensation voltage of which the temperature excursion size is equal to that of the multiplier and the direction is opposite to the direction of the multiplier is formed at the zeroing end of the multiplier through the temperature sensor and the grounding resistor, so that the influence of the temperature excursion on the analog multiplier is reduced effectively. The high-precision zero drift compensation circuit has a simple structure; and suppression to the zero drift of the analog multiplier is improved by an order of magnitude.
Owner:NAVAL UNIV OF ENG PLA
Broadband quadrature phase shifter
InactiveCN101741339AHigh quadrature accuracySmall phase shift errorMultiple-port networksCapacitancePhase shifted
The invention provides a broadband quadrature phase shifter which comprises a first transmission line transformer, a second first transmission line transformer, a first capacitor, a second capacitor, a first resistor and a second resistor; two secondary windings of the first transmission line transformer are connected end to end and grounded; two secondary windings of the second transmission line transformer are connected end to end and grounded; the upper end of the primary winding of the first transmission line transformer is grounded; the lower end of the primary winding of the second transmission line transformer is grounded; the primary winding of the first transmission line transformer is connected with the first capacitor and the first resistor in series in sequence to form a closed loop, and the sharing end of the first capacitor and the first resistor is connected with the first output end of the quadrature phase shifter; the secondary windings of the second transmission line transformer are connected with the second capacitor and the second resistor in series in sequence to form a closed loop, and the sharing end of the second capacitor and the second resistor is connected with the second output end of the quadrature phase shifter. Due to transmitting signals of wide frequency range, the transmission line transformers can be used as phase inverter circuits to realize quadrature phase shift of broadband signals.
Owner:北京东方信联无线通信有限公司
High power bipolar pulse generators with impedance transformation
InactiveUS7583159B2Efficient impedance transformationMaximize energy transferMultiple-port networksTransmission control/equlisationElectrical conductorTransmission line transformer
A bipolar pulse generator circuit generates bipolar pulses and provides an impedance transformation. The circuit is amenable for implementation in a variety of configurations depending on the size and pulse width requirements for the design. It also maximizes energy transfer and may be implemented in a straight forward, easy manner.The generator may be implemented with one or two switches in a three, five or more transmission line implementation and may include inductive stub, which is inherent element of transmission line transformers. The generator may also be implemented in a multi-layer folded configuration, with or without the addition of a ground potential conductor. The generator may also be implemented in stacked or / and balanced configurations.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC
30mhz~512mhz multi-band 2.5m whip antenna
InactiveCN105659921BSolve supporting problemsAchieve ultra-wideband characteristicsElongated active element feedMulti bandUltra-wideband
The invention provides a 30MHz-512MHz multi-band 2.5m whip antenna, which mainly solves the impedance matching problem between the antenna and the radio station. The entire antenna includes: a radiator, a coaxial cable 18, and a base 6. The radiator adopts a combined structure of a lower radiator 7 and an upper radiator 5. The lower radiator includes a lower copper tube 1 and an upper copper tube 3, two copper tubes The tubes are connected by a transmission line transformer 2, and a radiation oscillator 4 is fixed in the upper copper tube to form a sleeve antenna structure. The transmission line transformer adopts a three-winding center tap, and is equipped with four coils, which are respectively connected to the inner conductor, outer conductor, upper section copper tube, and lower section copper tube of the coaxial cable. It is used as both an electronic switch and an impedance matching element. Ultra-wideband characteristics in the 30MHz~512MHz frequency band. The invention has the advantages of wide frequency band, small standing wave ratio, high gain, no need for tuning, and can be directly matched with radio stations, and is suitable for installation on various armored vehicles and ships.
Owner:陕西烽火诺信科技有限公司
Transmission-line transformer
ActiveUS20110074519A1Multiple-port networksOne-port networksElectrical conductorTransmission line transformer
An example of a transmission-line transformer may include a transmission-line assembly and a balun assembly. The transmission-line assembly may include first and second conductors forming at least first and second transmission-line sections. The transmission-line assembly may provide a signal path through the first conductor and second conductor in series to a circuit ground. Balanced lines of the balun assembly may be connected to respective intermediate points on the first and second conductors between the first and second transmission-line sections. The transmission-line transformer may provide a signal path between a first end of the first conductor of the transmission-line assembly and the unbalanced line of the balun assembly.
Owner:WERLATONE INC
RF amplification device
InactiveUS7928802B2Increase the areaGated amplifiersAmplifier combinationsLoad circuitTransmission line transformer
An RF amplification device has amplification elements which amplify a radio frequency input signal in wireless radio communication. Transmission line transformers are coupled to one of an input electrode and an output electrode of the amplification elements and have a main line Lout arranged between the input and the output, and a sub line Lin1 arranged between an AC ground point and one of the input and the output and coupled to the main line Lout. By applying an operating voltage different from the ground voltage level to the AC ground point, the operating voltage is supplied to the output electrodes of the amplification elements via the sub line from the AC ground point. In realizing a high-performance load circuit in an RF amplification device, it is possible to avoid increase of a module height of an RF module.
Owner:RENESAS ELECTRONICS CORP
Module for separating different-mode signal and common-mode signal
InactiveCN103969532ASimple structureEnhanced inhibitory effectElectrical testingTransmission line transformerComputer module
The invention relates to a module for separating a different-mode signal and a common-mode signal. The module comprises a first transmission-line transformer. The two ends of a first transmission-line transformer primary coil are connected with the firing line output terminal and the null line output terminal of a line impedance stabilizing network respectively, the first transmission-line transformer primary coil is connected between the firing line output terminal and the null line output terminal, a center tap is arranged in the middle of the primary coil, the center tap is grounded through a first resistor, the center cap is connected with a common-mode signal output terminal, the firing line output terminal is further connected with one end of the input end of a second transmission-line transformer, the corresponding output end of the second transmission-line transformer is connected with a different-mode signal output terminal through a second resistor, the null line output terminal is further connected with the other end of the input end of the second transmission-line transformer, and the corresponding output end the second transmission-line transformer is grounded. The module has the advantages of being simple in circuit structure, good in common-mode rejection ratio and different-mode rejection ratio, precise in test effect, small in size, light in weight and the like.
Owner:北京泰派斯特科技发展有限公司
Distributed sag online monitoring system and method for optical fiber composite overhead ground wire
InactiveCN104121945ARealization of distributed online sag monitoringConverting sensor output opticallyInformation processingTransmission line transformer
The invention relates to a distributed sag online monitoring system and a distributed sag online monitoring method for an optical fiber composite overhead ground wire. The online monitoring system comprises a distributed optical fiber temperature and strain interrogator, a distributed optical fiber sensor and a computer system and information processing unit, wherein the distributed optical fiber temperature and strain interrogator is installed in a high-tension transmission line transformer station, the distributed optical fiber sensor is a sensor optical fiber in an optical fiber composite overhead ground wire, the sensor optical fiber of the optical fiber composite overhead ground wire is connected to the distributed optical fiber temperature and strain interrogator through an interface in the transformer station, and the distributed optical fiber temperature and strain interrogator is connected to the computer system and information processing unit. According to the distributed sag online monitoring system and the distributed sag online monitoring method, distribution of the sags of each span in the whole line can be monitored, system reliability is strong; online monitoring is adopted, thus being good in real-time performance and high in efficiency; the main machine of the detecting device is placed in the transformer station so as to be less influenced by environment; no additional sensor is arranged on the scene, thus being easy to maintain.
Owner:WUHAN KPCQ SOFTWARE TECH
Transmission-line transformer
ActiveUS8248181B2Multiple-port networksOne-port networksElectrical conductorTransmission line transformer
An example of a transmission-line transformer may include a transmission-line assembly and a balun assembly. The transmission-line assembly may include first and second conductors forming at least first and second transmission-line sections. The transmission-line assembly may provide a signal path through the first conductor and second conductor in series to a circuit ground. Balanced lines of the balun assembly may be connected to respective intermediate points on the first and second conductors between the first and second transmission-line sections. The transmission-line transformer may provide a signal path between a first end of the first conductor of the transmission-line assembly and the unbalanced line of the balun assembly.
Owner:WERLATONE INC
Dual output autotransformer
ActiveUS8576037B1Improve performanceImproving Impedance MatchingPrinted circuit aspectsTransformers/inductances coils/windings/connectionsAutotransformerTransmission line transformer
A dual output autotransformer is realized by employing a novel topology in which three transformers are wound on a single, high permeability, ferrite, binocular core. The three transformers are (1) an autotransformer; (2) a coupled winding to the autotransformer; and, (3) a transmission line transformer. Within the topology employed, the outputs of the coupled line transformer and the transmission line transformer provide the balanced output (secondary) and the input to the autotransformer forms the unbalanced primary. Such an approach results in a wideband response of from 30 MHz to 3000 MHz or greater with the requisite amplitude and phase balance.
Owner:SCI COMPONENTS
Antenna balun
Owner:PDS ELECTRONICS
Combiner for an RF power amplifier
ActiveUS9093731B2Scalable and configurableHigh frequency amplifiersPower amplifiersDielectricElectricity
Embodiments of the invention include a combiner for an RF amplifier comprising wiring and a transmission line transformer. The transmission line transformer may include a ferrite core having a hole defined therein; a coaxial cable having a first dielectric constant and routed through the hole of the ferrite core; and a stripline having a second dielectric constant and routed around the ferrite core. In some embodiments, an electrical length of the stripline is matched to an electrical length of the coaxial cable. The electrical length of the coaxial cable may be defined by the first dielectric constant and the electrical length of the stripline may be defined by the second dielectric constant.
Owner:EMPOWER RF SYST
Modularized solid state nanosecond pulse generator based on PCB Blumlein transmission line and transmission line transformer
ActiveCN106941346AReduce the impedance ratioSmall sizePulse generation by energy-accumulating elementEngineeringImpedance matching
The invention discloses a modularized solid state nanosecond pulse generator structure based on a PCB Blumlein transmission line and a transmission line transformer. The generator is combined with the characteristics that the Blumlein transmission line is liable to form a high-frequency nanosecond narrow pulse and the transmission line transformer is good in high-frequency characteristics. The generator employs a modularized structure design, and each module generates a primary pulse through Blumlein and the primary pulse is amplified and outputted to a load. A plurality of modules are in cascading connection for output, thereby increasing the voltage amplification factor, and increasing the output power. Meanwhile, because the modularized design is employed, the impedance transformation ratio of the transmission line transformer is also reduced, and the generator is more suitable for a small-impedance load. A microstrip line is used in the design for the design of a transmission line, and the impedance matching design can be carried out according to the size of a load. Meanwhile, the size of the generator is greatly reduced, and the compact design is achieved. Meanwhile, the generator employs an MOS tube as a switch, thereby facilitating the control of the generator, and achieving the convenient adjustment of the amplitude value and frequency.
Owner:CHONGQING UNIV
Transmission line transformer antenna
ActiveUS9490519B2Multiple-port networksAntennas earthing switches associationTransmission line transformerEngineering
The present invention is drawn a transmission line transformer that uses specifically displaced beads of impedance increasing material on the coaxial transmission lines. The beads of impedance increasing material greatly reduce induced back currents on the outer surfaces of the coaxial transmission lines, which reduces losses and improves performance. The specific displacement of the beads enables the coaxial transmission lines to be compactly disposed within a heat sink.
Owner:LILLY JAMES D +1
Broadband triple-circuit synthetic radiofrequency microwave power amplifier
PendingCN106788274AAchieve synthesisRealize the loadAmplifier modifications to raise efficiencyAmplifier with semiconductor-devices/discharge-tubesPush pullRadio frequency
Owner:GUANGDONG KUANPU TECH CO LTD
Slot array PCB (printed circuit board) antenna
ActiveCN104124517AAntenna arraysRadiating elements structural formsTransmission line transformerCoaxial transmission line
The invention discloses a slot array PCB antenna. The slot array PCB antenna comprises a first reflector and a second reflector which are designed integrally; a first radiating element layer and a first director are sequentially arranged above the first reflector, and a second radiating element layer and a second director are sequentially arranged above the second reflector; the connection portion between the first reflector and the second reflector is connected with a stub frequency selective network through a transmission line transformer, and the first radiating element layer and the second radiating element layer are respectively provided with a first feeder access point and a second feeder access point which are connected through a coaxial transmission line, the reflectors, the radiating element layers and the directors are all of a double-sided copper clad PCB structure, and a metalized through hole array is distributed in the double-sided copper clad board. The slot array PCB antenna has the advantages of good directivity and high gain of a yagi antenna as well as small size, light weight, low cost, high performance, integration and installation easiness and the like of a common planar antenna.
Owner:SUZHOU HUASHI WIRELESS TECH
Mobile nanosecond pulse ablation instrument
PendingCN111529059AAblation achievedEasy to operatePulse generation by energy-accumulating elementSurgical instruments for heatingMedicineTransmission line transformer
The invention discloses a mobile nanosecond pulse ablation instrument. The instrument comprises a cabinet body provided with universal wheels at the bottom, and is characterized in that a pulse generation system for generating nanosecond pulses is arranged inside the cabinet body, and a pulse output system for delivering the nanosecond pulses to a load is arranged outside the cabinet body; the pulse output system comprises a rocker arm fixed on the cabinet body and an electrode needle junction box fixed with the tail end of the rocker arm, and an electrode needle is arranged on the electrode needle junction box; a transmission line transformer is arranged in the rocker arm; one end of the transmission line transformer is electrically connected with the output end of the pulse transmissionsystem, and the other end is electrically connected with the electrode needle junction box. The ablation instrument can be directly used in the nanosecond pulse electric field ablation process, and has the advantages of convenient use, compact structure and good application prospect.
Owner:ZHEJIANG UNIV
P-band high-power amplifier device
ActiveCN104348426AIncrease transmit powerImprove reliabilityPower amplifiersAudio power amplifierCommunications system
The invention discloses a P-band high power amplifier device, and relates to a power amplifier device of a P-band signal channel portion in the communication field. The P-band high-power amplifier comprises a propelling-stage power amplifier, a last-stage power amplifier, a switch controller, a power supply, a cooling unit, a monitoring interface and a circulator. In the P-band high power amplifier device, a modularization technology, an integration technology, a thermal design technology and a transmission line transformer technology are adopted to finish high-power synthesis, and the size is relatively small. The P-band high power amplifier has the functions of low-power protection, thermal protection and reflecting protection; the P-band high power amplifier device further has a rapid switching function and a very large switch-off depth, and is particularly suitable to be taken as a power amplifier device in a P-band half-duplex communication system.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
Bipolar bias avalanche photo diode (APD) single photon detection system
ActiveCN102998007ALower requirementIncrease working frequencyInstrumentsPhoton detectionTransmission line transformer
The invention discloses a bipolar bias APD single photon detection system. The system comprises an APD circuit, a positive and negative bipolar bias generation circuit, a bipolar gate pulse generation circuit, a first transmission line transformer circuit, a second transmission line transformer circuit, a high-speed comparator circuit used for identifying avalanches. The system aims to use the bipolar gate pulses to be matched with bipolar direct current bias to excite an APD and detect positive and negative avalanche signals, positive and negative gate pulses are equivalent to unipolar bias of absolute amplitude sum of two gate pulses added on the APD, excitation of single photon avalanches of the APD under low direct current bias voltage and high gate pulse amplitude is facilitated, and accordingly, effects of dark counting and after pulses are reduced and the detection efficiency and the work efficiency of a single photon detector are improved .
Owner:广东华快光子科技有限公司
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