JFET Applications
JEFT as Analog Switch:
JFET can be used as an analog switch as shown in figure 1.It is major application of a JFET. The idea is to use 2 points on the load line: cut off and saturation. When the JFET is cut off, it is just like an open switch. When it is saturated, it is just like a closed switch.
![1407_JFET as analog switch1.png](https://www.expertsmind.com/CMSImages/1407_JFET%20as%20analog%20switch1.png)
Figure 1 Fig. 2
When VGS =0, JFET is saturated and operates at upper end of load line. When VGS is equal to or more negative than the VGS(off) , it is cut off and operates at lower end of the load line (open and closed switch).This is shown in the figure 2.
Only these 2 points are used for the operation when used as a switch. The JFET is normally saturated below the knee of the drain curve. For this reason the drain current is much smaller than the IDSS.
FET as a Shunt Switch:
The FET can be used as a shunt switch as shown in the figure 3. When Vcont=0, the JFT is saturated and switch is closed When Vcont is negative FET is just like an open switch. The equivalent circuit is also shown in the figure 3.
![1729_FET as shunt switch.png](https://www.expertsmind.com/../CMSImages/1729_FET as shunt switch.png)
Figure 3
FET as a series switch:
JFET can be used as series switch also as shown in the figure 6. When control is zero; the FET is a closed switch. When Vcon= negative, the FET is an open switch. It is better than shunt switch.
![1552_FET as series switch.png](https://www.expertsmind.com/../CMSImages/1552_FET as series switch.png)
Figure 4
Multiplexing:
One of the significant applications of FET is in analog multiplexer. Analog multiplexer is a circuit that selects one of the output lines as shown in figure 5. When control voltages are more negative all the switches are open and output is zero. When any control voltage becomes zero input is transmitted to the output.
![2364_multiplexing.png](https://www.expertsmind.com/../CMSImages/2364_multiplexing.png)
Figure 5
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