利用向量比较原理，得到了确定非线性电路平衡点全局渐近稳定的充分必要条件。

The sufficient and necessary conditions for the global asymptotic stability of the equilibrium point of the nonlinear circuits are obtained by vector comparison method.

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为了能使系统获得安全稳定运行的条件，又增加了系统电路保护自锁单元。

In order to obtain the stable operation condition, there is also increased protection self-locking unit.

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本文给出用运算放大器实现负电阻的实验电路及其分析，主要讨论电路的稳定条件。

In this paper, the electric circuit of linear negative resistance was designed with operational amplifier, and its characters. Special stability condition, were analysed.

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