The asynchronous transceiver transceiver example circuit is used to display the results. In the simulation environment, the excitation signal is set to 50 ns, the power supply is set to 5V, and other settings are defaulted. The U3-5 pin of the RTSB network is simulated. The simulation situation is shown in Figure 3. The a curve is the signal waveform before termination. See that there is a serious signal reflection; curve b, c is the signal waveform after the ground termination resistor, the termination resistance value is different; d curve is the signal waveform after the Dyvenan termination, from the figure can be seen that the termination resistance can Basically eliminate reflection, the disadvantage is that the termination resistor to ground causes the high level voltage to drop, and the termination resistor to the power supply causes the power supply to rise low.
Based on the continuous development of microelectronics technology, the use of high-speed devices and the design of high-speed digital systems are increasing. The system data rate, clock rate and circuit density are increasing, and the design requirements for PCB boards are getting higher and higher. It is a signal integrity issue. To ensure good signal integrity of the PCB, it is necessary to integrate various influencing factors, rational layout and wiring, thereby improving product performance.