Disadvantages of Junction Field Effect Transistors (JFETs)
- It has high drain resistance
- Moderate input impedance
- It is slower in operation
Explain avalanche breakdown with respect to PN junctions.
Avalanche breakdown is a phenomenon which occurs in lightly doped junctions which occur when a high reverse voltage is applied across the junction which tend to cause an increase in electric field across the junction. This generated electric field exerts a force on the electrons at junction and frees them from the covalent bonds. These free electrons will gain acceleration and it will start moving across the junction with high velocity. This results in collosion with neighbouring atoms. These collisions in high velocity tend to generate more free electrons. These free electrons will start drifting and electrons -hole pairs recombination occurs across the junction which results in a rapid increase in current uncontrollably. <a href="https://kol.jumia.com/api/click/link/f0647e0d-9d90-4183-b025-e2cf08db8f34/42461daf-6d6a-4cf2-b0ca-7e066511e571"><img src="https://kol.jumia.com/banners/OK6RTn7jyXBJ8ORsrvFNC6o0L8wUYB5zNJOYzNEI.jpg" alt="PHONES CATEGORY"
good post
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