Parameters of jfet.pptx

its says about the parameters of jfet.

1. Parameters of jfet BY: M.SAKETH KUMAR 22R21A67G3 CSD-C

2. WHAT IS JFET? The junction field effect transistor (JFET) is one of the simplest types of field effect transistor This is voltage controlled device. JFET has three terminals they are: 1)Drain(D) 2)Gate(G) 3)source(S) The JFET is further classified into 1)P channel JFET 2)N channel JFET

3. P Channel & N channel JFET:

4. APPLICATIONS OF JFET: JFET is used as a switch JFET is used as a chopper JFET is used as a buffer JFETs are used in oscillatory circuits

5. PARAMETERS OF JFET: There are 3 parameters of JFET they are: 1) Trans conductance(g m ) 2) Drain resistance( r d ) 3) Amplification factor(µ)

6. 1)TRANS CONDUCTANCE: It is the slope of transfer characteristic curve and is given by g m = △I d / △V GS ( at constant drain voltage) It is denoted by g m It is the ratio of a small change in drain current to the corresponding small change in gate voltage at a constant drain voltage Units: mho

7. 2)DRAIN RESISTANCE: Drain resistance is reciprocal of slope of drain characteristics. It is the ratio of a small change in drain voltage to the corresponding small change in drain current at a constant gate voltage is called drain resistance It is denoted by ( r d ) It is given by r d =△V DS /△I D (At constant v GS ) Units: Ohms

8. 3)AMPLIFICATION FACTOR: It is the ratio of small change in the drain voltage to corresponding small change in gate voltage at a constant drain current is called Amplification factor. It is denoted by (µ) It is given by µ=(-△V DS /△V GS ) (At constant drain current) The negative sign indicates that when V GS is increased V DS must be decreased for I D to remain constant.

9. RELATIONSHIP AMONG PARAMETERS OF JFET:

10. THANK YOU