BJT transistors FET ( Field Effect Transistor) 1. Unipolar device i. e. operation depends on only one type of charge carriers (h or e) 2. Voltage controlled.

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Presentation transcript:

BJT transistors

FET ( Field Effect Transistor) 1. Unipolar device i. e. operation depends on only one type of charge carriers (h or e) 2. Voltage controlled Device (gate voltage controls drain current) 3. Very high input impedance (   ) 4. Source and drain are interchangeable in most Low-frequency applications 5. Low Voltage Low Current Operation is possible (Low-power consumption) 6. Less Noisy as Compared to BJT 7. No minority carrier storage (Turn off is faster) 8. Self limiting device 9. Very small in size, occupies very small space in ICs 10. Low voltage low current operation is possible in MOSFETS 11. Zero temperature drift of out put is possiblek Few important advantages of FET over conventional Transistors

Types of Field Effect Transistors (The Classification) JFET MOSFET (IGFET) n-Channel JFET p-Channel JFET n-Channel EMOSFET p-Channel EMOSFET Enhancement MOSFET Depletion MOSFET n-Channel DMOSFET p-Channel DMOSFET FET

Figure: n-Channel JFET. The Junction Field Effect Transistor (JFET)

Gate Drain Source SYMBOLS n-channel JFET Gate Drain Source n-channel JFET Offset-gate symbol Gate Drain Source p-channel JFET

Figure: n-Channel JFET and Biasing Circuit. Biasing the JFET

Figure: The nonconductive depletion region becomes broader with increased reverse bias. (Note: The two gate regions of each FET are connected to each other.) Operation of JFET at Various Gate Bias Potentials

PP + - DC Voltage Source N N Operation of a JFET Gate Drain Source

Figure: Circuit for drain characteristics of the n-channel JFET and its Drain characteristics. Non-saturation (Ohmic) Region: The drain current is given by Where, I DSS is the short circuit drain current, V P is the pinch off voltage Output or Drain (V D -I D ) Characteristics of n-JFET Saturation (or Pinchoff) Region:

Figure: n-Channel FET for v GS = 0. Simple Operation and Break down of n-Channel JFET

JFET Transfer Curve This graph shows the value of I D for a given value of V GS