PCB board layout techniques-PCB Assembly -2
A 50Ω transmission line will consume more power; greater resistance certainly can reduce power consumption, but would hate large transmission delay time. Since the negative capacitance will cause the increase of transmission delay time and pcb assembly the characteristic impedance decreases. However, the line characteristic impedance is very low intrinsic capacitance per unit length is relatively large, so the transmission delay time and characteristic impedance less affected by the load capacitance. With the appropriate transmission line termination is an important feature is that branches should be short-term delay of the line had little effect. When Z0 is 50Ω time. Short length of the branch must be limited to less than 2.5cm. To avoid significant ringing.
(4) For the two-panel (or six boards to go four lines). China PCB Assembly Circuit board on both sides of the line is to be perpendicular to each other to prevent mutual crosstalk induced primary production.
(5) If on the PCBA Assembly with high current devices such as relays, lights, speakers, and their ground is best to go separately to reduce to line noise, the ground of these high current devices should be connected to the plug on the board and back to the bus go up a separate, independent ground and they should also take place with the whole system is connected.
(6) If the board has a small signal amplifier, the pre-amplify PCB Assembly the weak signal lines away from strong signal, and the alignment should be as short as possible, if possible, but also shield them land lines.