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50 results about "Self resonance frequency" patented technology
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The self-resonant frequency essentially tells you the frequency above which the capacitor starts behaving like an inductor. Why is this so important? Imagine taking your design and replacing all the capacitors with inductors of various values; then, sweep the frequency of the input and watch how it responds.
Differential inductor design for high self-resonance frequency
ActiveUS6972658B1Low effective capacitanceRaise the self-resonant frequencySemiconductor/solid-state device detailsSolid-state devicesCapacitanceEngineering
A differential inductor is formed from branch coils that are staggered with respect to one another rather than concentrically coiled within one another. Each coil is formed from conductive strips. The conductive strips with the largest voltage swings thereon are shielded from one another by conductive strips with lower voltage swings thereon. This shielding allows the effective capacitance of the differential inductor to be lowered, which in turn raises the range of frequencies at which the differential inductor can operate.
Owner:QORVO US INC
Lamination sheet type wave filter and method for producing the same
InactiveCN101404485ARaise the sensory valueLarge inductance inductorMultiple-port networksCapacitanceElectrical conductor
The invention belongs to the technical field of electronic components and relates to a multi-layer chip filter and a preparation method thereof. The filter leads in ceramics and ferrite in the same chip and simultaneously realizes large inductance and large capacitance; wherein, the inductance consists of a hollow inductance (a 'magnetic core' is a ceramic material) and a magnetic core induction (the magnetic chip is ferrite material). The hollow inductance is characterized by small inductance value, large quality factor, high self-resonance frequency, and the like, thus being capable of better broadening the working frequency section of the filter; the magnetic core inductance has the characteristics of large inductance value, low self-resonance frequency, and the like, thus better reducing the in-band insertion loss of a filter with a low cut-off frequency and improving the effect of the transmission signal of the filter. The preparation method of the multi-layer chip filter includes the steps such as material preparing, casting, punching, pore filling, conductor printing, chip overlapping, isostatic pressing, gumming, sintering, etc. The filter has the advantages of small size, large rectangle degree, large out-band rejection as well as broad working frequency. The preparation method has high controllability and can be compatible with the technique of the existing chip components.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Electromagnetic sensing device having multi-point touch function
InactiveUS20110205191A1Input/output processes for data processingGraphicsElectromagnetic electron wave
An electromagnetic sensing device having a multi-point touch function comprises electromagnetic pens (101) for inputting graphics and an electromagnetic sensing board for detecting trace information of the inputted graphics. Each of the electromagnetic pens (101) has a resonance circuit provided therein, and the electromagnetic sensing board has an electromagnetic wave transmitter (102), an electromagnetic wave receiver (105), a controller (109) and an electric wave frequency switching unit (103) provided therein. The electric wave frequency switching unit (103) of the electromagnetic sensing board receives an instruction from the controller (109) to control the electromagnetic wave transmitter (102) to transmit electromagnetic waves at different frequencies, and the electromagnetic pens (101) generate electromagnetic resonance waves at respective resonance frequencies. The electromagnetic wave receiver (105) receives the electromagnetic resonance waves at the respective resonance frequencies so that the trace information of the electromagnetic pens (101) having the respective resonance frequencies is detected. With this electromagnetic sensing device, it is possible to achieve a wireless and passive electromagnetic sensing device having the multi-point touch function.
Owner:HANVON CORP
Method of preparing multi-component high-frequency thin ferromagnetic film material with component gradient
The invention relates to a method for preparing a high-frequency ferromagnetic film material with component gradient under the room temperature condition. The invention adopts the proposal that in a vacuum thin film gradient sputtering device, a ferromagnetic material is adopted as a main material target and arranged below a sputtered base plate; simple substances, oxides, nitrides, borides, carbides or phosphides are taken as adulterants to be arranged at the position outwards deviated from the center of the base plate, during the sputtering, the components of the main material target form an even film on the base plate, and the components of an adulterant target form a film provided with the components of the adulterants and distributed in gradient form along a certain direction. The invention adopts the design that the main material target is rightly opposite and the adulterant target is eccentric, the graded distribution of the components of the adulterants is realized, and the purpose that the uniaxial anisotropy is obtained is attained. The saturation magnetization (Ms) of the prepared film material is 8 to 25 kG, the equivalent field (Hk) of the uniaxial anisotropy, etc. is 50 to 400 Oe or higher, and the self-resonant frequency is close to 3G Hz or higher.
Owner:FUJIAN NORMAL UNIV
Common-mode choke coil
ActiveUS20100045418A1Reduced self-resonance frequencyImprove immunityTransformers/inductances coils/windings/connectionsUnwanted magnetic/electric effect reduction/preventionElectrical resistance and conductanceEngineering
A common-mode choke coil has induction immunity characteristics that are improved by a coil structure preventing a transmitter IC and a receiver IC from malfunctioning during an induction immunity test and which controls a decrease in ESD resistance and a decrease in self-resonance frequency. The common-mode choke coil includes a core, external electrodes, a pair of coils, and a top plate. The core includes a core section and a pair of flange sections. The pair of coils are wound around the core section of the core, and the ends of the coils are connected to the external electrodes, respectively. An underside and a side surface of the top plate are plated with a metal film, and bonded to the top surfaces of the flange sections preferably by an adhesive agent. The metal film is segmented into two separate portions so as to define two separate metal sections with a gap therebetween so that the metal sections are electrically disconnected.
Owner:MURATA MFG CO LTD
Semiconductor Device and Fabricating Method Thereof
InactiveUS20100140739A1Reduce parasitic capacitanceRaise the self-resonant frequencySolid-state devicesSemiconductor/solid-state device manufacturingDielectricParasitic capacitance
Disclosed is a semiconductor device which includes a substrate having an air layer or void therein, an interlayer dielectric film above the substrate, and a metal wiring having a spiral structure on the interlayer dielectric film corresponding to or over the air layer. The semiconductor device exhibits reduced parasitic capacitance between the metal wiring (used as an inductor) and the substrate, thereby improving a self-resonance frequency as well as an applicable frequency band of the inductor.
Owner:DONGBU HITEK CO LTD
Electric toy car powered by rail-type wireless power supply system
InactiveCN103259346ARealize wireless power supplySmall sizeElectromagnetic wave systemCircuit arrangementsEngineeringSelf resonance frequency
The invention discloses an electric toy car powered by a rail-type wireless power supply system. The electric toy car powered by the rail-type wireless power supply system comprises a transmitter and a receiver which have the same self-resonance frequency, an electric toy car rail is arranged above the area in which a transmitting coil of the transmitter is located, the receiver and a commutating and voltage-stabilizing module are mounted on a chassis of the electric toy car, a receiver is connected to an input end of the commutating and voltage-stabilizing module, and an output end of the commutating and voltage-stabilizing module is connected to an electric motor of the electric toy car. A power source supplies power to the transmitter, the operation of the receiver and the operation of the transmitter are of resonant coupling under the resonant frequency, and energy which is received by the receiver is converted into a voltage-stabilized direct current through the commutating and voltage-stabilizing module and is supplied to the electric motor. The toy car moves on the rail, and the speed of the electric toy car can be adjusted through changes of the power and frequency. By means of the rail-type wireless power supply system, the electric toy car gets rid of the constraint of batteries, the size of the motor is reduced, the weight of a car body is reduced, the conversion efficiency of electric energy is high, pollution to the environment caused by the usage of the storage batteries is reduced, and a good effect in energy conservation and environment protection is achieved.
Owner:SOUTHEAST UNIV
Inductor/transformer and manufacturing method thereof
ActiveUS20090115560A1Reducing substrate lossSemiconductor/solid-state device testing/measurementSemiconductor/solid-state device detailsLine widthTransformer
A manufacturing method for the inductor / transformer is disclosed. A simulator is used to simulate the inductance, the quality factor, and the self-resonance frequency of said inductor / transformer to generate at least one group of the area size, the number of the conductive layer, the line width, the number of turns, and / or the line space of the conductive layers and the first conductive layer; the inductor / transformer is manufactured according to the factors. Thereafter, the Monte-Carlo simulation is used to initiate the process variability analysis of the factors of the conductive layer and the first conductive layer, and the geometric size of the inductor / transformer can be modulated according to the results of the process variability analysis during the manufacturing process, such that the inductor / transformer can be manufactured by the process of the generic logic circuit.
Owner:AIROHA TECHNOLOGY CORPORATION
Common-mode choke coil
ActiveUS7855627B2Improve immunityReduce resistanceTransformers/inductances coils/windings/connectionsUnwanted magnetic/electric effect reduction/preventionElectrical resistance and conductanceEngineering
A common-mode choke coil has induction immunity characteristics that are improved by a coil structure preventing a transmitter IC and a receiver IC from malfunctioning during an induction immunity test and which controls a decrease in ESD resistance and a decrease in self-resonance frequency. The common-mode choke coil includes a core, external electrodes, a pair of coils, and a top plate. The core includes a core section and a pair of flange sections. The pair of coils are wound around the core section of the core, and the ends of the coils are connected to the external electrodes, respectively. An underside and a side surface of the top plate are plated with a metal film, and bonded to the top surfaces of the flange sections preferably by an adhesive agent. The metal film is segmented into two separate portions so as to define two separate metal sections with a gap therebetween so that the metal sections are electrically disconnected.
Owner:MURATA MFG CO LTD
Method of constructing a differential inductor
ActiveUS8276259B1Low effective capacitanceLittle and voltage swingLine/current collector detailsElectrical transducersNear neighborEngineering
Owner:QORVO US INC
Antenna coil device
ActiveUS7034756B2Loop antennas with ferromagnetic coreAntenna supports/mountingsCapacitanceSelf resonance frequency
Owner:SUMIDA CORP
Power supply device and its designing method, generator thereof
InactiveCN1457128ABatteries circuit arrangementsApparatus with intermediate ac conversionTransformerMiniaturization
Although increasing the switching frequency is effective to downsize a power supplying apparatus, the switching loss of a switching element increases if the switching frequency is increased. In a power supplying apparatus including a transformer having a very high boosting ratio, and a plurality of switching elements for supplying AC power to the primary side of the transformer, the frequency of the AC power is set to 0.25 to 2 times the self-resonance frequency of the transformer.
Owner:CANON KK
Inductor and formation method thereof, and integrated passive device and formation method thereof
InactiveCN103400828AReduced series resistanceAvoid defects that do not flow uniformly to individual wiresSemiconductor/solid-state device detailsSolid-state devicesResonancePeak value
The invention discloses an inductor and a formation method thereof, and an integrated passive device and a formation method thereof. The formation method of the inductor comprises the steps of providing a semiconductor substrate; forming a first medium layer on the semiconductor substrate; forming a metal layer on the first medium layer; forming a mask layer on the metal layer, and forming a first opening and a second opening in the mask layer, wherein the size of the first opening is greater than the size of the second opening; etching the metal layer along the first opening and the second opening until the first medium layer below the first opening is exposed, and leaving the metal layer at predetermined thickness at the bottom of the second opening; removing the mask layer. According to the invention, a quality factor of the inductor in each frequency of an alternating current circuit is improved, the peak value of the quality factor of the inductor is larger, an auto-resonance frequency is larger, and the performance of the integrated passive device comprising the formed inductor is better.
Owner:SHANGHAI HUAHONG GRACE SEMICON MFG CORP
Paint capable of shielding chromatic circle inductor and process for coating chromatic circle inductor
ActiveCN105609301ASmall change in inductance valueShield interferenceMagnetic paintsEncapsulation/impregnationDiluentEngineering
The invention provides paint capable of shielding a chromatic circle inductor and a process for coating the chromatic circle inductor. The paint capable of shielding the chromatic circle inductor is characterized by comprising the following materials in percentage by mass: 25-50% of chromatic circle inductor paint, 20-55% of soft magnetic ferrite magnetic powder, 10-30% of liquid curing agent and 10-30% of diluent; the manufacturing method for the paint capable of shielding the chromatic circle inductor and the process for coating the chromatic circle inductor comprise the steps of coating for two times by using the paint capable of shielding chromatic circle inductor, and then coating for two times by using the paint capable of shielding chromatic circle inductor. The paint capable of shielding the chromatic circle inductor and the process for coating the chromatic circle inductor have the advantages that interference on other parts caused by leakage flux generated in operating of the chromatic circle inductor can be effectively shielded; the cost of the coating can be greatly reduced; the inductance value can be increased; the self-resonance frequency is increased; and the paint is mainly suitable for packaging of the chromatic circle inductor.
Owner:深圳市同利科斯电子有限公司
Laminated sheet type ceramic delay line
InactiveCN102394335AWith miniaturizationWith long delay capabilityDelay linesWorking environmentElectronic component
The invention relates to a laminated sheet type ceramic delay line, which belongs to the technical field of electronic components. The delay line comprises a plurality of metal wire delay cell laminated bodies and a plurality of metal ground electrode laminated bodies, wherein the plurality of the metal wire delay cell laminated bodies and the plurality of the metal ground electrode laminated bodies are laminated together in a staggered mode; a plurality of the metal wire delay cells are connected in series in turn and are connected to the surface of a device through metallized through holes;and the surface of the device is provided with a signal input end, a plurality of signal output ends, a ground electrode port and a port mark. With the adoption of a low temperature co-fired ceramic (LTCC) technology, a plurality of the metal delay line cells which are connected in series in turn are integrated in a lamination mode, so that the volume and the weight of the delay line are effectively reduced, and the delay line has the characteristics of good insulation property, great merit factors, high self-resonance frequency, wide working bandwidth and the like; and simultaneously, metal delay cells are embedded in a dielectric ceramic body to improve the reliability of the delay line so that the delay line can adapt to various different working environments.
Owner:成都成电电子信息技术工程有限公司
Soft magnetic alloy material and preparation method thereof
ActiveCN109967734ATransportation and packagingMetal-working apparatusSelf resonance frequencyPre treatment
The invention discloses a soft magnetic alloy material and a preparation method thereof. The preparation method comprises the following steps of S1, preparing soft magnetic alloy FeSiCr powder with the particle diameter ranging from 8 microns to 15 microns; S2, preparing soft magnetic alloy FeSiCr powder with the particle diameter ranging from 1 micron to 3 microns; S3, forming metal films on thesurfaces of soft magnetic alloy FeSiCr powder particles in the step S1 through a vapor deposition method; S4, conducting heat treatment on the powder treated in the step S3 to prepare pre-treated softmagnetic alloy powder; S5, mixing the pre-treated soft magnetic alloy powder with the soft magnetic alloy FeSiCr powder in the step S2 in proportion to prepare mixed soft magnetic alloy powder; and S6, adding the mixed soft magnetic alloy powder into a metaphosphate or phosphate solution, then adding in nano-silica and / or nano-magnesia, and conducting immersing and drying. The prepared soft magnetic alloy material has a high self-resonance frequency and a Q value, and can be applied in a high frequency scene with 1 MHz or more.
Owner:DONGGUAN HUALUO ELECTRONICS CO LTD
Driving device for vibration type regulator
InactiveCN1419333ASmooth vibrationPromote absorptionDC motor speed/torque controlAC motor controlDriving currentDriver circuit
The present invention actualizes a drive suited to accummulation, capable of attaining effective drive near the resonance frequency of an oscillating actuator. This drive for oscillating type actuator employs a FLL (Frequency Locked Loop) which detects electromotive force generated at a driving winding by mechanical oscillation during down period of the driving current of an oscillating type actuator, controls oscillating frequency in accordance with the relative time ratio of positive and negative polarities, and draws driving frequency into a section nearer to the self-resonance frequency of the oscillating type actuator.
Owner:TEIKOKU TSUSHIN IND CO LTD +1
Apparatus and method for transmitting power wirelessly
ActiveUS20200076245A1Efficiently determinedHeat generated is often so severeBatteries circuit arrangementsElectric/magnetic detectionTelecommunicationsWireless transmission
The present invention provides wireless power transmitting method and apparatus. The wireless power transmitting method according to an embodiment of the present invention may measure a resonance frequency while changing an operating frequency of a resonance circuit, compare the measured resonance frequency with a reference frequency, and wirelessly transmit power when the measured resonance frequency is lower than the reference frequency. The reference frequency may be determined based on two or more among a self resonance frequency of the resonance circuit, a first resonance frequency measured for a receiving device, a second resonance frequency measured for a reference object and a third resonance frequency measured for the receiving device and the reference object.
Owner:HITACHI LG DATA STORAGE KOREA
Radio-frequency coil arrays and methods of arranging the same
ActiveUS20140300359A1Electric/magnetic detectionMeasurements using magnetic resonanceCoil arrayEngineering
In accordance with various embodiments, a radio frequency (RF) coil array for use in a magnetic resonance imaging (MRI) system includes at least first and second RF coils. Each of the RF coils have a main body loop configured to at least one of transmit or receive RF energy at an operating imaging frequency in connection with acquiring MRI image data for an MRI system. The RF coil array also includes first and second cables configured to electrically couple the first and second RF coils, respectively, to a system interface. The RF coil array also includes a common ground connection between the first and second cables. The common ground connection is selectively positioned at a grounding point along lengths of the first and second cables to form a ground loop having a select self-resonance frequency (SRF) that differs from the imaging frequency of the MRI system.
Owner:GENERAL ELECTRIC CO
Inductor component
InactiveCN108242315AImprove DC Superposition CharacteristicsImprove overlay propertiesTransformers/inductances coils/windings/connectionsTransformers/inductances magnetic coresHigh resistanceEngineering
The invention provides an inductor component with high inductance and a good DC superposition characteristic. The inductor component can realize high resistance in the high frequency side that is higher than the self-resonance frequency. The inductor component includes a drum core (33) including a winding core portion (32) extending along a longitudinal direction and a pair of flange portions (34,35) disposed on end portions of the winding core portion, a plate core (37) arranged between the pair of flange portions, a wire (38) wound around the winding core portion and a pair of terminal electrodes (39, 40) that are electrically connected to the end portions of the wire. The drum core and the plate core are made of a magnetic material. An average distance (G) between the plate core and the pair of flange portions is no less than about 20 [mu]m and no more than about 50 [mu]m. The wire includes aligned banked winding portions (B1-B4) arranged along the longitudinal direction and more than half of a total number of turns of the wire belong to the aligned banked winding portions (B1-B4).
Owner:MURATA MFG CO LTD
Module for parallel lighting and balancer coil for discharge lamp
InactiveUS20060055338A1Made tallerReduce the coupling coefficientElectric discharge tubesElectric light circuit arrangementElectrical conductorEffect light
A small balancer coil for cold-cathode florescent lamps having sufficient shunt / balance effects, comprises a discharge lamp, a conductor located close to the discharge lamp, and two coils whose magnetic fluxes face each other. The magnetic fluxes generated in the coils face and cancel each other. Lamp currents of the discharge lamps are balanced by making the sum of the reactances of the mutual inductance of the balancer coil larger than the negative resistance of the discharge lamp. Section winding is applied to each coil of the balancer coil so as to maintain shunt and balance effects even in a small / flat balancer coil by making self-resonance frequency of each of the coils higher.
Owner:HONG FEI CHEN +2
Metal button device for mobile terminal, and mobile terminal with same
ActiveCN106848611ASimple, versatile and reliable handheld detection designSimple State Detection DesignAntenna supports/mountingsElectronic switchingResonanceComputer module
Owner:QINGDAO HISENSE MOBILE COMM TECH CO LTD
3-D transformer for high-frequency applications
InactiveUS20060176136A1Improve conductivityIncrease stiffnessAdditive manufacturing apparatusTransformers/inductances coils/windings/connectionsElectrical resistance and conductanceTransformer
A stressed metal technology may fabricate high-Q, three-dimensional microelectronic inductors and transformers. The fabrication method may allow the production of inductors and transformers on high-resistivity silicon substrate and with metal deposition of Au and Cr that is fully compatible with semiconductor fabrication technologies. The produced inductors and transformers exhibit Q factors>60 at frequencies of 3 to 7 GHz. High efficiency, high-Q transformers with coupling factors 0.6<k<0.9 may be created with very high self-resonance frequencies
Owner:PURDUE RES FOUND INC
Antenna coil device
ActiveUS20050052337A1Loop antennas with ferromagnetic coreAntenna supports/mountingsCapacitanceEngineering
In an antenna coil device 11, a coil portion 12 having a lead wire 2 wound around a magnetic core 1 is mounted on a case 3 made of plastic resin, and on one side of the case 3, terminal boards 4 and 5 that electrically connect one end and the other end of the lead wire 2 of the coil portion 12 to an external device are placed in a protruding manner. A through hole 4D is provided in an inserting end portion 4C of the terminal board 4, a through hole 5H is provided in a central flat portion 5G of the terminal board 5, and the two through holes 4D and 5H are placed opposite each other. This reduces stray capacitance caused between the two terminal boards 4 and 5 connected to both ends of the coil portion 12, and allows a self resonance frequency band where an impedance is equal to or above a predetermined value to be shifted to a high frequency side.
Owner:SUMIDA CORP
Low-temperature sintering soft magnetic ferrite material and preparation method thereof
InactiveCN110372363ASimple ingredientsLower firing temperatureInorganic material magnetismMagnetic beadCopper oxide
The invention discloses a low-temperature sintering soft magnetic ferrite material and a preparation method thereof, and belongs to the technical field of electronic information functional materials and devices. Iron-nickel-zinc-copper oxide is used as a main component composition, CBS glass is used as a sintering aid, and the low-temperature sintering soft magnetic ferrite material is prepared bya solid-phase reaction method and prepared by ball milling, drying, pre-sintering, secondary ball milling, drying and pulverization and sieving and the other processes. The low-temperature sinteringsoft magnetic ferrite material has the characteristics of low sintering temperature, high self-resonance frequency, high quality factor and high impedance and can be used for manufacturing peak magnetic beads and chip inductors, and the problem that a magnetic body and a silver electrode cannot co-sinter well is solved.
Owner:SHANDONG GREEN TEC MOTOR DRIVEN TECH
Gyrotron and electronic device using same
InactiveCN1447094ASmall characteristic deviationLower the altitudeMechanical apparatusSpeed measurement using gyroscopic effectsResonanceSelf resonance frequency
A columnar vibrator (2) that performs open-ended bending vibration is mounted on one main surface of the mounting substrate (12), and a drive detection circuit is mounted across the abdomen centerline (n2) of the bending vibration caused by the resonance of the mounting substrate (12). Use part (13). In addition, the self-resonant frequency of the flexural vibration of the mounting substrate (12) is lower than that of the vibrator (2), and the self-resonant frequency of the flexural vibration after the vibrator (2) and the drive detection circuit parts (13) are mounted is lower than that of the vibrator (2). The self-resonance frequency of the bending vibration of the monomer is high, and is inconsistent with the bending vibration frequency of the vibrator (2). The present invention provides a vibrating top and an electronic device using the vibrating gyroscope with little change in characteristics between the time of characteristic adjustment before cover mounting and the completion time after cover mounting, although it has a thin mounting substrate and can be reduced in height.
Owner:MURATA MFG CO LTD
PFC inductor and variable-frequency air conditioner
InactiveCN104485201ASimple structureLow costTransformers/inductances coils/windings/connectionsTransformers/inductances magnetic coresSelf resonance frequencyElectrical impedance
The invention provides a PFC inductor and a variable-frequency air conditioner. The PFC inductor comprises a base, a magnetic core, a separator and a coil, wherein the edge of the magnetic core is fixedly connected with the base; the coil is wound around the magnetic core; the separator is arranged in the diameter of the magnetic core in a direction perpendicular to the base, and is fixedly connected with the magnetic core; fixing parts are arranged on the two sides of the separator, and the two end portions of the coil penetrate through the two fixing parts correspondingly one to one and then are fixed on the base. Due to the adopted structure, the impedance of the PFC inductor is higher than the impedance of two common PFC inductors in the prior art by more than 20%; meanwhile, the self-resonance frequency on the circuit is increased to about 320KHz from the original 270KHz, thereby inhibiting clutter signals generated by the circuit, and therefore, the filtering application effect is improved.
Owner:SHENZHEN YAMAXI ELECTRONICS
Module for parallel lighting and balancer coil for discharge lamp
InactiveUS7479740B2Sufficient shunt/balance effectSufficient effectElectric discharge tubesElectric light circuit arrangementElectrical conductorEffect light
Owner:HONG FEI CHEN +2
Integrated radio-frequency circuit
An RF circuit (310) may be formed over a triple well (316, 318, 320) that creates two reverse biased junctions. By adjusting the bias across the junctions, the capacitance across the junctions can be reduced, reducing the capacitive coupling from the RF circuits (310) to the substrate (316), improving the self-resonance frequency of inductors and reducing the coupling of unwanted signals and noise from the underlying substrate to the active circuits and passive components such as the capacitors and inductors. As a result, radio frequency devices, such as radios, cellular telephones and transceivers such as Bluetooth transceivers, logic devices and Flash and SRAM memory devices may all be formed in the same integrated circuit die using CMOS fabrication processes.
Owner:ALTERA CORP
Radio-frequency circuit realizing stable operation
InactiveUS20070129028A1Prevent parasitic oscillationImprove reliabilityResonant long antennasHigh frequency amplifiersImpedance matchingSelf resonance frequency
A television signal transmitter has an up-converter provided with a pre-amplifier and an impedance matching circuit subsequent to the pre-amplifier. The self-resonance frequency of an inductor included in the impedance matching circuit, which is connected in series to a signal line, is set to a parasitic oscillation frequency (5 GHz) of the pre-amplifier. The self-resonance frequency of an inductor of a filter provided prior to the pre-amplifier, which is connected in series to the signal line, is set to the parasitic oscillation frequency (5 GHz) of the pre-amplifier.
Owner:ALPS ALPINE CO LTD
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