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Circuit of high frequency PCB designs 66 common problems

Circuit of high frequency PCB designs 66 common problems

[introduction] develop quickly as electronic technology, and the wide application of wireless communication technology in each domain, high frequency, high speed, high density already made one of remarkable development trends of contemporary electron product stage by stage. Signal is transmitted high frequency change and high speed digitlization, force PCB to move toward small hole and bury / blind Kong Hua, lead is changed subtly, medium layer is even thin model change, high density of high frequency high speed is multilayer…

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The output curve of field effect transistor (example is unscrambled)

The output curve of field effect transistor (example is unscrambled)

[introduction] how does the output curve of field effect transistor understand? Field effect canal outputs characteristic curve cent to be 3 areas: Alterable resistance area, constant current area and puncture area. When VDS is lesser, job of field effect canal is in alterable resistance area, ID makes linear change along with VGS approximately. When VDS is bigger, the job is in constant current area, ID keeps stable, do not follow the change of VGS and change. Be more than some…

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Teach you a few minutes to learn to detect 23 extremely stand or fall of canal, Mos canal, resistor, capacitance, potentiometer

Teach you a few minutes to learn to detect 23 extremely stand or fall of canal, Mos canal, resistor, capacitance, potentiometer

[introduction] in routine process, hard to avoid can encounter circuit board, appear various breakdown, but how do you know to maintain? A board is taken on at hand, is the feeling at a loss what to do? Next, small make up take you to learn how to detect on circuit board all sorts of commonly used yuan of parts of an apparatus, church you are fast of begin electron product debug with maintenance.   In routine process, hard to avoid…

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Lucky core microelectronics and OPPO sign VOOC to shine fill patent to permit an agreement

Lucky core microelectronics and OPPO sign VOOC to shine fill patent to permit an agreement

[introduction] on November 6, 2018, shenzhen OPPO and microelectronics of Fuzhou luck core announce to sign VOOC formally to shine fill patent to permit an agreement, both sides is shining fill technical domain to spread out win-win collaboration, quicken VOOC to show the diversification progress that fills zoology.   On November 6, 2018, limited company of OPPO Guangdong mobile (the following abbreviation: OPPO) with Inc. of microelectronics of Fuzhou luck core (the following abbreviation: Lucky core microelectronics) announce to sign…

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Speed sensor prevents the application that holds dead system in the arms to go up in ABS

Speed sensor prevents the application that holds dead system in the arms to go up in ABS

[introduction] the development as car electron technology, the safety performance technology of the car gets the attention of people, braking system all serves as main safety it is to get attention fully more, ABS (Anti-lockedBrakingSystem) prevent adopt dead brake system, it is one kind is had prevent the slippery, automobile safety that defends a lock to wait for an advantage to death to control a system.   It has the function of apply the brake of common brake system already,…

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Class of new-style accept rice is fiber-optic stress sensor: Use at element and cellular level machine to explore

Class of new-style accept rice is fiber-optic stress sensor: Use at element and cellular level machine to explore

[introduction] the foundation of most biology course is distinctive Namisheng material resources learns incident, conduce to drive reaction and directive and chemical way. These small active force clew may be very delicate and dog hard, but they are the complex share that the environment is answered and maintains life. As the ceaseless development that exceeds instrument of stress of acute accept rice, outside body observe inside body even, measure and operate processes of these active force forehead are one lasts…

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Ai Rui electron has the honor to win Chinese area ” HR Asia 2018 year employer of Asian optimal industry ” special honour

Ai Rui electron has the honor to win Chinese area ” HR Asia 2018 year employer of Asian optimal industry ” special honour

[introduction] Ai Rui electron of company of global technology solution announces to have the honor to win “2018 of area of HR Asia China now year award of TM” of employer of Asian optimal industry. Ai Rui electron ever had the honor to win this special honour for many times, include in the center this year earlier before in Hong Kong and Malaysia area and also was the same as at Singapore and Malaysia area 2017 obtain promulgate this award….

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High power is only a manostat of type Silent Switcher 2 is contented CISPR 25 Class 5 EMI limits a demand

High power is only a manostat of type Silent Switcher 2 is contented CISPR 25 Class 5 EMI limits a demand

[introduction] increase as the twice of amount of system of the electron in the car, the risk that electromagnetism interference produces inside the car also lifted considerably. Accordingly, the electronic product in new-style car often must accord with CISPR 25 Class 5 EMI to test a level, this level is right conduct model blast off with radiation EMI did rigid limitation. As a result of the property of its itself, switch power source is full of EMI, diffuse in the…

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Power source of detailed analyse switch inputs end in all model and anti-noise circuit of wrong standard inductance

Power source of detailed analyse switch inputs end in all model and anti-noise circuit of wrong standard inductance

[introduction] the alleged signal that need a standard is two size the signal with equal, opposite way. Plan institute is shown is in all model and circuit of wrong standard inductor, this also is the EMI filter in loop of input of report of town of communication of switch power source, the L1 in circuit, L2 is wrong standard inductor, l3 and L4 are in all modular inductor, c1 is X capacitance, c2 and C3 are Y capacitance. This circuit…

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Resistor still has the branch of precision, does tall accurate resistor have what special requirement?

Resistor still has the branch of precision, does tall accurate resistor have what special requirement?

[introduction] actually, to not be to do metric what do not need branch is so clear, can substantially thinks tall nicety, tall accurate, small error is a meaning. Not quite tall to precision resistor, we need not be divided, say how much some resistor precision is generally. For instance the resistor of 0.1% precision, it is an integrated error, it is to say actually, fall in normal temperature (for instance 10 ℃ – 35 ℃ ) , 1 year in,…

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