Road board designs mobile phone report skill: Improve the method of frequency function
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source:BAGANZ CNC Machining
Introduction: 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 span that is two lines another bit should keep changeless all the time, want to keep parallel namely. Parallel means has two kinds, one kind goes in for two lines same layer taking a line, one kind walks along two in fluctuation photograph adjacent for two lines. The way that realizes with former Side-by-side commonly is more. Road board design improves mobile phone report frequency function should: Discretion considers rock-bottom program. Good rock-bottom program should differentiate the circuit of different type in different area. Use the signal that need branch as far as possible. The frequency parts of an apparatus that contains the input that need branch can restrain noise. Difference is to cannot add ground wire commonly among cent signal. Because differ the applied principle of minute of signal the most important is to use difference to distribute the profit that mutual coupling place brings between signal, if flux is eliminated, the ability that fight a confusion of voices. If the inter adds ground wire, can destroy coupling effect. 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 span that is two lines another bit (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, one kind goes in for two lines same layer taking a line (Side-by-side) , one kind walks along two in fluctuation photograph adjacent for two lines (Over-under) . The way that realizes with former Side-by-side commonly is more. Keep apart ground connection electric current, in order to avoid the noise that digital electric current adds imitate circuitry. Basically, the model / it is right that several ground break up segregation. Those who want an attention is signal walks along a line to had been not crossed as far as possible have intersected place, still have the way of circumfluence electric current that does not allow power source and signal change is too big. Digital-to-analogue signal takes a line cannot alternate requirement is because of speed its return a bit fast number signal voltaic method is met as far as possible the fountainhead along the signal of ground regurgitate number near the lower part that takes a line, if digital-to-analogue signal walks along line across, the noise that returns voltaic place generation can appear inside imitate circuit area. Imitate circuit uses astral shape ground contact. The voltaic wastage of frequency power amplifier is general very big, this may consult to the ground connection of themselves or other ground connection has undesirable effect. Ground plane will not become with area on circuit board. The line takes in signal around implementation ground connection is enclothed, go to the billabong of redundant high frequency energy in line in order to pass capacitance coupling the earth. Road board design improves mobile phone report frequency function not should: In board on use mixture circuit. Although the radio frequency area of the mobile phone is considered as simulative commonly, but the cacophony that from radio frequency area the noise in frequency circuit meets coupling be gotten to can listen by demodulation. Wiring of imitate frequency signal is too long. Mark of too lasting imitate frequency line may be disturbed by the noise of number and radio frequency circuit. Overlook the value of ground connection loop. The system with bad ground connection can appear serious and lack fidelity, noise, string together sound and radio frequency to fight faze ability low problem. Interrupt the natural loop of digital electric current. The annulus road area that this one method produces is the smallest, can reduce aerial influence and inductance effect. Ignored the position that all should set bypass capacitance the power source pin that is close to its to want bypass in the likelihood. CNC Milling