Basic knowledge of impedance circuit board

Basic knowledge of impedance circuit board

What are the characteristics of impedance circuit board

In general, in order to ensure the safety of electricity and the smooth use of electrical appliances, the circuits we use at home are basically impedance circuit boards. Not only that, in public places, the circuits used are also impedance circuit boards. When doing electronic design, you will encounter many problems when encountering high-speed circuits. There will also be many new terms, such as overshoot, undershoot, delay, impedance, and reflection. So today I will tell you about the basics of impedance circuit boards and what are the characteristics of impedance circuit boards.

Basic knowledge of impedance circuit board:

With the rapid increase of signal transmission speed and the wide application of high-frequency circuits, higher requirements have been put on printed circuit boards. The circuit performance provided by the printed circuit board must be able to make the signal not reflect during the transmission process, keep the signal intact, reduce the transmission loss, and play the role of matching impedance, so as to obtain a complete, reliable, accurate, interference-free, low-noise Transmission signal.

In PCB design of high-speed digital circuits, whether we design products using DDR2 or DDR3 memory, whether it is PCIE differential or SATA transmission, high-speed PCB design technology is used, and the PCB we designed uses impedance control technology Later, there was basically no situation where the PCB problem could not run. To understand the design knowledge of high-speed signals, we must start with some basic electronic knowledge.

The free electrons in a conductor move under the action of an electric field to form a current. The direction of the current is just a convention established in physics, and the direction of the current is physically the direction of the directional movement of positive charges or the opposite direction of the directional movement of negative charges. The speed of the current is not the speed of the electrons, but the speed of the electric field.

What are the characteristics of the impedance circuit board:

The characteristic of the impedance circuit board is shunting. For example, the current flowing into your home is fixed. In each circuit, different currents are allocated according to the required common rate. The circuit voltage in parallel to the main power supply is constant. It is 220V. We know that the rated power of electrical appliances on the market in China is 220V, which is one reason why households use impedance circuit boards. The series circuit is just the opposite. It guarantees the same current throughout the circuit, but the voltage will be distributed as needed.

About what the basic knowledge of impedance circuit boards are, and what are the characteristics of impedance circuit boards, I will share so much for you today. The circuit in the home is actually a hybrid circuit, that is, there is an impedance circuit board and an impedance circuit board. There is a master switch on this circuit. When the switch is disconnected, the entire circuit will be without current. The home circuit adds a parallel circuit on the basis of the impedance circuit board to ensure that each circuit is relatively independent when the circuit is unblocked. This is the circuit in the home circuit.