Yes, Size Does Matter

摘要

Most signal integrity problems stem from reflections of the signal at impedance discontinuities. Luckily, this is also the easiest problem to fix. By following a simple rule of thumb, the reflection problems created by stubs can be avoided. We use termination strategies to manage the reflections that will arise at the ends of the traces. In point-to-point architectures, the most commonly used termination strategy is a source series resistor, with a resistance selected so that its resistance plus the output impedance of the driver equals the characteristic impedance of the transmission line.