1, how to choose PCB board?
Choice PCB plank must be mixed in contented design requirement can measure produce equilibrium point is gained among gender and cost. Design requirement is included electric with the orgnaization this two parts. Designing board of special high-speed PCB normally (the frequency that is more than GHz) when it is more important that this material is inscribed questioningly.
How do 2. needs distributinging line kind come true?
The wiring with poor right cent has wanted to notice at 2 o'clock, the length that is two lines should grow euqally as far as possible, the another span that is two lines (this span is decided by the impedance that need branch) should keep changeless all the time, want to keep parallel namely. Parallel means has two kinds, go in for two lines same layer taking a line (Side-by-side) , walk along two in fluctuation photograph adjacent for two lines (Over-under) . General with former Side-by-side(side by side, side-by-side) the means of implementation is more.
3. outputs the clock line of end to having only, how to realize the wiring that need branch?
Wanting wiring of the cent that use difference is signal source and sink certainly also be the signal that need branch ability is significant. The clock signal that carries to having an output only so cannot use the wiring that need branch.
Does 4. sink differ minute of line to be opposite between can you deny add block of a distribution?
Sink difference divides a line to be opposite block can increase a distribution between normally, its are worth the value that should be equal to the impedance that need branch. Such signal quality will be better.
How does 5. resolve the contradiction between the manual wiring of high speed signal and automatic wiring?
The automatic wiring of stronger now wiring software implement for the most part set restrains a condition to control the means that wind a string to had reached opening number. The ability of the engine that wind a string of each EDA company and the set project that restrain a condition differ sometimes very far. For example, whether sufficient tie condition controls route of move with the body on the ground (the means with winding Serpentine) , whether the span taking a line that controls poor cent to be opposite. Whether can the means taking a line that this meeting influence comes out to automatic wiring accord with the architect's idea. Additional, the hand is moved those who adjust wiring is difficult easy also have absolutely concern with the ability of the engine that wind a string. For example, take the elbow ability of the line, cross the elbow ability of aperture, walk along a line to be waited a moment to the elbow ability of apply copper even. So, the choice circles the wiring with line engine strong capability implement, just be settlement way.
6. should have many number in PCB board together / modular function piece when, groovy practice is to want to will be counted / modular ground is apart, does the reason where?
Will count / because digital circuit is when switch of potential of on any account,the account with modular separate ground is can mix in power source landed unripe noise, the size of noise is concerned with the speed of signal and voltaic size. If be not broken up on ground level and the noise that produces by place of digital area circuit is bigger and the circuit of imitate area is close to very much again, criterion although digital-to-analogue signal not across, simulative signal still can be disturbed by ground noise. That is to say digital-to-analogue ground is not used when the digital circuit region that intersected means can be apart from generation big noise in imitate circuit area only is more remote.
The develop that how 7. adjusts a line attacks the integrality that will the framework come to raise signal?
Direction of signal of this kind of network is more complex, because be opposite one-way, two-way signal, signal of different n sort, influence of develop Chinese hackberrya is different, very Chinese hackberrya of which kinds of develop is opposite it's hard to say signal quality is advantageous. And when before making, be being emulated, use why to plant develop Chinese hackberrya is very tall to engineer requirement, the requirement is right circuit principle, signal type, even wiring difficulty want to understand.
Why should 8. spread copper?
General store copper has reason of a few respects. 1, EMC. The land that accumulates to bedding face or power source spread copper, screen action reachs since the meeting, specially, if safety action reachs since PGND. 2, PCB craft asks. Eletroplate to assure commonly the effect, or lamination is not out of shape, less to wiring PCB ply spreads copper. 3, signal integrality asks, give signal of high frequency number a whole circumfluence way, reduce the wiring of dc network. Still have of course medicinal powder hot, installation of special parts of an apparatus asks to spread copper to wait a reason a moment.
Does 9. what is meant by the wiring that need branch?
Difference distributes signal, some also call differential signal, with two just the same, the signal with opposite polarity transmits one a movement in martial arts to occupy, rely on difference of two signal n to have a court decision. Agree to make sure two signal are complete, want to keep collateral when wiring, span of wide, line holds the line changeless.
When 10. is doing Pcb board, to reduce interference, whether should be ground wire formed shut and form?
When doing PCB board, will tell commonly should reduce loop area, so that reduce interference, cloth ground wire when, also do not answer cloth is become close form, however cloth Cheng Shuzhi record is better, return the acreage that have even if should increase the ground as far as possible.
