系统共地引发LATCH-UP及应对措施

每一个系统都有自己的VDD、GND，信号都是相对本系统的GND而言。在某些特殊场合，系统间信号传输切换伴随着“共地”的过程，在这样的过程中若两个GND之间的电位不同，就会在两个不同的GND之间发生能量交换。如果两者电位相差很大，这种能量交换所发生的冲击可能会诱发系统中集成电路内部发生LATCH-UP。文中对这种特殊使用场合发生的LATCH-UP现象进行了描述，并通过对这种LATCH-UP现象的实验、分析，提出抑制发生这种LATCH-UP的措施。

Inducing LATCH-UP in Common-ground Course of Systems and Solution

Each system has VDD and GND of its own. Signals are relative to GND of the system. In some special cases, transfer and switch of signal between systems chaperonage a common-ground course. In such a course, energy exchange occurs between GNDs whose potentials are different. If the difference of their potentials is great, the strike produced in energy exchange may make LATCH-UP in Integrated Circuits used in systems. This paper describes LATCH-UP phenomena occurred in such a special use environment. By experiments and analyses to LATCH-UP phenomena, some methods are offered to restrain LATCH-UP occurrence.