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Routing Principle Of Double Circuit Board

Shenzhen Inno Circuit Co.,Ltd | Updated: Jun 19, 2017

Double-layer circuit board that is double-layer pcb board, double-layer circuit board on both sides of this circuit board wiring, but to use the two sides of the wire, must be between the two sides have the appropriate circuit connection Caixing. The "bridge" between such circuits is called a guide hole. The guide hole is in the pcb, filled with or coated with metal holes, it can be connected with the two sides of the wire. Use PROTEL to draw double-sided pcb board, in TopLayer (top layer) to draw wire connection components, is in the top drawing board; select BottomLayer (bottom), in the bottom of the wire to connect components, is the bottom of the drawing board. Above is to draw double-layer pcb, meaning a pcb board in the top and bottom are painted wire. The double panel solves the difficulty of wiring in a single panel (which can pass through the hole to the other side), that is, Double Layers PCB both sides of the front and back wiring, the components can be welded on the front, can also be welded on the back, it is more suitable for use Single-panel more complex on the circuit.

Double layer circuit board - design and wiring principles

The two-layer board ground wire is designed as a grid-shaped frame, that is, the parallel lines are printed on the side of the printed circuit board, the other side is the vertical ground of the copy board, Double Layers PCB and then connected with the metal via holes Hole resistance to be small).

In order to take into account each IC chip should be installed near the ground, often every 1 ~ 115cm cloth a ground, so dense ground to make the signal loop area smaller, is conducive to reducing radiation. The ground network design method should be in the cloth signal line before, otherwise it is more difficult to achieve.

Principle of signal wiring for double - layer circuit board

Double board in the rational layout of the components to determine, followed by the first design to copy the power cord, and then cloth important line --- sensitive lines, high-frequency lines, cloth after the general line --- low-frequency line. The key lead is preferably a separate power supply, ground circuit, lead and very short, Double Layers PCB so sometimes in the key line edge of a ground line close to the signal line, let it form the smallest working loop.

Four-layer board top, the bottom of the wiring principle with the two-layer signal line, but also the first cloth key crystal, crystal circuit, clock circuit, CPU and other signal lines, must follow the circulation area as small as possible principle.

Double layer circuit board - wiring techniques

The use of automatic router to design pcb is attractive. In most cases, automatic routing of pure digital circuits (especially low-frequency signals and low-density circuits) will not be a problem. However, when attempting to use the automatic routing tool provided by the cabling software to do the wiring of analog, mixed-signal or high-speed circuits, there may be some problems and may cause extremely serious circuit performance problems. [1] There are many things to consider about wiring, Double Layers PCB but the more troublesome problem is grounding. If the ground path is started by the upper layer, the grounding of each device is connected to the ground via the cable on the layer. For each device in the lower layer, a ground circuit is formed by connecting the upper hole on the right side of the circuit board to the upper layer. The immediate red flag that the user sees when checking the routing mode indicates that there are multiple ground loops. In addition, the lower ground circuit is at a level. Can reduce the digital switching δi / δt on the impact of analog circuits. It should be noted, however, that the two sheets have a ground plane in the lower layer of the circuit board. Double Layers PCB This is designed so that engineers can quickly see the wiring when doing troubleshooting, often in the device manufacturer's demonstration and evaluation board. But it is more typical to lay the ground plane on the upper side of the board to reduce the electromagnetic interference (emi).