pcb信号完整性分析（PCB Signal Integrity Analysis）.docVIP

pcb信号完整性分析（PCB Signal Integrity Analysis） This article from the north side of the mountain with Doc document may at the WAP end of the browsing experience poor. Suggest you select TXT, or download the source file to the machine view. PCB signal integrity analysis PCB signal integrity Assembly of electronic equipment design must consider the problem of design and implementation of signal integrity, in the analog circuit, due to the use of the single frequency or narrow band signal, circuit function is most concerned about the SNR, usually do not need to discuss the signal waveform and waveform distortion. However, fundamental changes have taken place in the realization of circuit function in digital circuit: the signal is a periodic pulse, work is sudden, logical relations become the core, need to strictly ensure the time interval and the timing relationship. Therefore, it is proposed to ensure the requirements of the design of signal integrity. General can consider signal integrity should include the following meanings: waveform distortion signal should be controlled in a certain range, the timing diagram of the signal flow can meet the requirements of production and process logic, the transmission signal in the condition of steady burst. The signal integrity comes mainly from two reasons, the first is due to outside interference, especially the interference conduction channel includes the reflection effect of transmission channel impedance mismatch caused by the destruction of the original waveform; secondly, the digital signal will occur naturally in the spread spectrum dispersion effect, the original waveform changed. When the clock frequency is high, such as clock time to reach 10MHz above or below 1ns pulse edge, we will find that the signal is transmitted to the desired place is not easy, there are many factors that affect the signal integrity problems, including jitter, delay and ground bounce, reflection, crosstalk, a switching noise and power loss distribut