Printed Circuit Board (PCB), also known as circuit board, PCB board, aluminum plate, high-frequency board, ultrathin circuit board, thin board, printing (copper etching techniques) circuit board is an important electronic components, is the support of electronic components, electronic components line connected to the provider.

1. The Principle of Printed Circuit Boards
Printed Circuit Board (PCB), also known as circuit board, PCB board,
aluminum plate, high-frequency board, ultrathin circuit board, thin
board, printing (copper etching techniques) circuit board is an
important electronic components, is the support of electronic
components, electronic components line connected to the provider. The
traditional circuit boards, the method of printing etching resist, to make
a circuit of the circuit and drawings, so it is called printed circuit board
and printed circuit board. Due to the electronic products will continue
to small and fine, at present most of the circuit board are posted in the
attached etching resistance agent (lamination or coating), after
exposure significantly actress, to etch make circuit board.
1. Structure
Circuit board mainly by pad, hole, mounting holes, wire, components,
connectors, filling, electrical boundary. Common plate layer structure
comprises a single plate (single layer PCB), double plate (double layer

2. PCB and multilayer board. The main functions of each component are
as follows:
Pad: metal hole for welding components pins.
Vias: metal vias and non metal vias, wherein the metal hole for
connection between each layer components pins.
Mounting hole: used for fixing the circuit board.
Conductor: an electrical network of copper film for connecting
component pins.
Connector: for connecting components between circuit boards.
Filling: the application of copper wire to the ground network can
effectively reduce the impedance.
Electrical boundary: used to determine the size of the board, all of the
components on the circuit board can not exceed the boundary.

3. 2. Principle of Circuit Board
The working principle of the circuit board is: the base plate insulating
material is separated from the conductive copper foil surface layer,
makes the current along the pre design good line in various
components in flow to complete such as acting, amplification,
attenuation, modulation, demodulation, coding function.
On the basic of the PCB, parts in the side, wire is concentrated on the
other side. Because the conductor appeared only in one side, so the
PCB is called a single panel. Multilayer board, multilayer wire must be
proper circuit connection and the bridge between the circuit called a
guide hole (via) between the two layers. The basic design process of
circuit board can be divided into the following four steps:

4. (1) Circuit schematic design --- circuit schematic design is mainly used
DXP Protel schematic editor to draw schematic.
(2) Generated web forms-- web report is to show links between the
circuit principle and components in each report, it is bridge and the link
to connect the circuit principle diagram design and circuit board design,
through the circuit principle diagram of the network statements can
quickly find the connections between components, so as to provide
convenience for the back of the PCB design.
(3) Printed circuit board design, printed circuit board design is
normally referred to as PCB design, it is the circuit principle diagram is
transformed into the final form, this part of the design is circuit
principle diagram design have great difficulty, we can with Protel DXP
powerful design function in the completion of this part of the design.
4) Generate table of printed circuit board. After the completion of the
printed circuit board design, the need to generate various reports, such
as generating pin statements, circuit board information report, network
status reports and finally print out printed circuit board.

5. China PCB Board Manufacturer
Mobile Phone PCB