This document discusses field effect transistors (FETs), including JFETs and MOSFETs. It provides figures illustrating the structure and characteristics of an n-channel JFET, including its biasing circuit. The document also shows typical drain characteristics and transfer curves of a JFET.

2. FET ( Field Effect Transistor)
1. (h or e)
2. ()
3. (≈109
-1012
Ω)
4.
5. ()
6. BJT
7. ()
8.
9. ,
10. MOSFETs
FET

3. ()
 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

4. Figure: n-Channel JFET.
(JFET)

5. n-channel JFET n-channel JFET
Offset-gate symbol
p-channel JFET

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

7. Figure
(: FET )
JFET

8. P P +
-
+
-
+
-
N
N
JFET

9. Figure: n-Channel FET for vGS = 0.
JFET

10. Figure: If vDG exceeds the breakdown voltage VB, drain current increases rapidly.
Break Down Region
JFET

11. Figure: Typical drain characteristics of an n-channel JFET.
VD-ID CMOS FET
Locus of pts where ( )PGSDS VVV −=

12. Figure: Transfer (or Mutual) Characteristics of n-Channel JFET
2
1








−=
P
GS
DSSDS V
V
II
IDSS
VGS (off)=VP
() JFET

13. JFET
of ID VGS

14. Biasing Circuits used for JFET
