Electronic products have penetrated into every aspect of our lives, from smartphones to televisions, from computers to smart homes, without exception, circuit boards are indispensable. However, for most people, the dazzling array of components and circuits on circuit boards is still full of mystery and incomprehension. Especially those two common identifiers, VDD and GND, must have puzzled many people. So, what exactly are VDD and GND? What role do they play in circuit boards?
In the field of electronics, VDD refers to the positive power supply voltage, specifically the supply voltage or the positive pole in a circuit. It is the source of energy in the circuit, similar to our human heart, providing stable energy for the entire circuit system. And GND refers to the ground, which is the negative pole in the circuit. Analogous to the gravity of the Earth, GND can absorb residual charges in the circuit and guide them into the ground.
VDD and GND play a crucial role in the circuit, together forming the power system of the circuit. VDD provides the necessary positive voltage for the circuit, while GND provides a reference level for the circuit. In the design process of circuit boards, it is very important to plan and arrange the routing of VDD and GND reasonably. Good design can reduce voltage drop and noise of the power supply, ensuring stable operation of the circuit.
In addition to their power supply function, VDD and GND also have other important characteristics. Firstly, the voltage difference between VDD and GND is referred to as voltage or potential difference. Voltage is the driving force behind the flow of electrons in a circuit. According to Ohm’s law, voltage is equal to the product of current and resistance. Therefore, by controlling the voltage difference between VDD and GND, we can alter the flow and velocity of electrons in the circuit, achieving various functions of the circuit.
In addition, VDD and GND also serve as reference and transmission for many important signals in the circuit. For example, in digital circuits, VDD and GND are used to determine the input and output levels of logic gates, enabling information transmission and processing. In analog circuits, VDD and GND are used to set reference levels to ensure signal accuracy and stability. It can be said that VDD and GND are the fundamental framework and channels for information flow in the electronic world.
In summary, VDD and GND on the circuit board play a crucial role in the field of electronics. They are not only the source of energy and the path of gravity for circuits, but also the fundamental framework for signal transmission and processing. For the design and manufacturing of circuit boards, scientifically and reasonably planning and utilizing VDD and GND is the key to ensuring stable operation and high performance of the circuit.