The MOSFET

The acronym MOSFET (pronounced “MOSS-fet”) stands for metal-oxidesemiconductor field-effect transistor. A simplified cross-sectional drawing of an n-channel MOSFET and its schematic symbol are shown in Fig. 1a and b. The p-channel device is shown at Fig. 1 c and d.
When the MOSFET was first developed, it was called an insulated-gate FET or IGFET. This is perhaps more descriptive of the device than the currently accepted name. The gate electrode is actually insulated, by a thin

Fig. 1. Pictorial diagram of an n-channel MOSFET (a), schematic symbol for an n-channel MOSFET (b), pictorial diagram of a p-channel MOSFET (c), and schematic symbol for a p-channel MOSFET (d).

layer of dielectric, from the channel. As a result of this, the input resistance (and hence the impedance) is extremely high. The MOSFET draws essentially no current from the input signal source. This is an asset in weak-signal amplifiers.

مواضيع ذات صلة

الحجم النووي Nuclean Size

ربوتات النانو (Nanorobots)

تلسكوبات الأشعة تحت الحمراء والسينية

المقاومة الداخلية المرتفعة لبطارية ليثيوم-ايون

أهمية تقنية النانو (Importance of nanotechnology)

متسعات المرشح على التوالي Filter Capacitors in series

أشباه الموصلات

ظاهرة الحفز الضوئي

مكشاف أشباه الموصلات Semiconductor detector

ميكروسكوبات السليكون

تأثيرات الدفيئة وثقب طبقة الأوزون

مخطط الطاقة لوصلة ال PN