The inverted portion of the channel region ends at a pinch-off point before reaching the drain.
沟道区域中的反型部分在到达漏极之前的夹断点终止。
On the grounds of the pinch-off voltage, the cut-off point of variable resistance area and saturation area can be fixed, so the field effect tube can reliably work in the saturation area.
根据夹断电压能确定可变电阻区与饱和区的分界点，使场效应管可靠地工作在饱和区的原理。
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