脉冲的电压，宽度，预设直流偏压和偏置时间可以由用户设定。
Pulse voltage, pulse width, preset DC bias, and bias time can be defined by user.
黑线表示没有偏压，红线表示有一个反向偏置电压。
Black lines are without external bias and red lines are with and external reverse bias voltage.
用此一性质可将偏置电压调制为零省去偏置系统，利于系统集成，为实现无偏压双稳系统指明了方向。
Thus, the bias voltage could be modulated to be 0. This saved the bias setup is benefited to system integration and pointed out way of realizing biasless bistable device.
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