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Date: 17-5-2017
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Date: 22-10-2020
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Date: 18-10-2020
1156
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DEPLETION AND PINCHOFF
A JFET works because the voltage at the gate causes an electrical field that interferes, more or less, with the flow of charge carriers along the channel. As the drain voltage ED increases, so does the drain current ID, up to a certain level-off value. This is true as long as the gate voltage EG is constant and is not too large. As EG increases (negatively in an n channel or positively in a p channel), a depletion region develops within the channel.
Charge carriers cannot flow in the depletion region, so when there is such a region, they must pass through a narrowed channel. The larger EG becomes, the wider the depletion region gets, and the more constricted the channel becomes. If EG is high enough, the depletion region completely obstructs the flow of charge carriers, and the channel cannot conduct current at all. This condition is known as pinchoff. It is like pressing down on a garden hose until the water can’t flow.
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حمية العقل.. نظام صحي لإطالة شباب دماغك
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إيرباص تكشف عن نموذج تجريبي من نصف طائرة ونصف هليكوبتر
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شعبة مدارس الكفيل النسوية تطلق فعّاليات مخيم (بنات العقيدة) العشرين
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قسم التربية والتعليم يعقد اجتماعاً تحضيرياً لملاكاته استعداداً لانطلاق برنامجه التأهيلي
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متحف الكفيل يعقد أولى اجتماعاته التحضيرية لمؤتمره الدوليّ الخامس
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وفد قسم الشؤون الفكرية وسفير العراق في فرنسا يبحثان سبل تعزيز التعاون المشترك
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