like and respect yourself.

विषय पर प्रस्तुति: "like and respect yourself."— प्रस्तुति प्रतिलेख:

1 like and respect yourself.
Thought of the Day The way you give your name to others is a measure of how much you like and respect yourself. गुरुवार, 2 मई 2019 FETs

2 Field Effect Transistors (FETs)
D.C. Kulshreshtha गुरुवार, 2 मई 2019 FETs

3 Types of FETs Two main types :
Junction Field Effect Transistor (JFET). Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) (also called IGFET) गुरुवार, 2 मई 2019 FETs

4 Both are fabricated as discrete components and as components on IC.
MOS transistors can be made very small. Digital logic memory can be implemented exclusively by using MOSFETs (without resistors and diodes). VLSI circuits are made using MOS technology. गुरुवार, 2 मई 2019 FETs

5 Two types of MOSFETs Depletion-type MOSFET (DE MOSFET).
(Similar to JFET). Enhancement-type MOSFET (EN MOSFET). गुरुवार, 2 मई 2019 FETs

6 FETs Two types: These are unipolar transistors. N-type channel.
P-type channel. These are unipolar transistors. गुरुवार, 2 मई 2019 FETs

7 JFET गुरुवार, 2 मई 2019 FETs

8 Analogy between BJT & JFET
गुरुवार, 2 मई 2019 FETs

9 Formation of Channel गुरुवार, 2 मई 2019 FETs

10 Working of JFET गुरुवार, 2 मई 2019 FETs

11 गुरुवार, 2 मई 2019 FETs

12 This is called pinch-off voltage, VP.
At point P, the two depletion regions tend to meet at a point near drain. This is called pinch-off voltage, VP. The channel width can reduce only to a constant minimum value. Increasing vDS beyond VP extends the length of the constricted channel. The channel acts as a current limiter. Saturation Current, IDSS –the Drain-to- Source current with the gate Shorted. गुरुवार, 2 मई 2019 FETs

13 गुरुवार, 2 मई 2019 FETs

14 JFET Characteristics गुरुवार, 2 मई 2019 FETs

15 Drain Characteristics of N-Channel JFET
गुरुवार, 2 मई 2019 FETs

16 As a convention, Vp is negative voltage for N-channel JFET.
The minimum value of gate-to-source voltage required to make the drain current zero is called gate-to-source cut-off voltage, VGS(0). As a convention, Vp is negative voltage for N-channel JFET. When VGS = Vp, the current ID reduces to zero. The curve joining the pinch-off points is a parabola, given by गुरुवार, 2 मई 2019 FETs

17 The saturation voltage VDS(Sat) on the curve is given as
गुरुवार, 2 मई 2019 FETs

18 In the ohmic region, or voltage controlled resistance region, or the triode region, the resistance is controlled by VGS. The JFET is normally operated in the active region, or pinch-off region, or saturation region. In this region, the JFET gives linear amplification. गुरुवार, 2 मई 2019 FETs

19 JFET Transfer Characteristics
गुरुवार, 2 मई 2019 FETs

20 Note that the curve meets the iD-axis at IDSS and VGS-axis at –Vp.
The curve is given by Shockley Equation. गुरुवार, 2 मई 2019 FETs

21 गुरुवार, 2 मई 2019 FETs

22 गुरुवार, 2 मई 2019 FETs

23 गुरुवार, 2 मई 2019 FETs

24 MOSFETs Reading Assignment : From Page 163 to 173

25 FET Parameters Dynamic Drain Resistance (rd) :
Typically, it is about 500 kΩ.

26 Trans-conductance or Mutual Conductance (gm) :
Typically, it ranges from 150 μS to 400 μS.

27 (3) Amplification Factor (μ) :
Typically, it is about 150.

28 Relationship between parameters

29 Review Types of FETs. JFET. Analogy between BJT & JFET.
Formation of Channel. JFET Characteristics. Drain Characteristics of N-Channel JFET. Shockley Equation. गुरुवार, 2 मई 2019 FETs