PCB buried resistor and capacitor technology is a process of embedding resistors and capacitors inside the PCB board. Normally, resistors and capacitors on PCBs are directly soldered onto the board surface through surface mount technology, while buried resistors and capacitors are embedded into the internal layers of the PCB board using buried resistor and capacitor technology. This type of printed circuit board includes a first dielectric layer, a buried resistor, a circuit layer, and a second dielectric layer in sequence from bottom to top.
Among them, the part of the buried resistor without a circuit layer is covered with a polymer isolation layer, and the surface of the polymer isolation layer is roughened, with a surface roughness Rz greater than 0.01 μ m. The thickness of the polymer isolation layer at the corner is at least 0.1 μ m.
The printed circuit board of this utility model is covered with a polymer isolation layer on the surface of the buried resistor, thereby protecting the buried resistor from being attacked and corroded by chemical solutions during subsequent wet processes such as browning and ultra roughening, improving the manufacturing process capability of the buried resistor board, and further promoting the application of buried resistors in the inner layer.
Several advantages of buried resistance and buried capacitance technology:
Space saving: As resistors and capacitors are directly embedded into the internal layers of the board, it can save space on the PCB board, making the entire circuit board more compact.
Reducing circuit noise: Embedding resistors and capacitors into the internal layers of the board can reduce electromagnetic interference and noise in the circuit, improve its stability and anti-interference ability.
Improving signal integrity: The buried resistor buried capacitor process can reduce the transmission delay and reflection loss of circuit signals, and improve the integrity and reliability of signal transmission.
Reducing the thickness of PCB board: As resistors and capacitors are embedded in the internal layers of the board, the thickness of the PCB board can be reduced, making the entire circuit board thinner and lighter.