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JFET Common Drain Characteristics

Description

The basic circuit for the common-drain configuration or the source follower configuration is shown. As is evidentfrom the figure no resistor is connected in series with the drain terminal. The voltage across resistor RS providesthe gate-source biasing voltage. This configuration is similar to the common-collector configuration for the BJTs.Like the common-collector configuration, the common-drain configuration also offers high input impedance, lowoutput impedance, nearly unity voltage gain and no input-output phase reversal.

Procedure:

1. Connect the circuit as shown.2. Use RG of 1 kΩ and RS of 470 Ω. The DCSource0 is used for VGS and DCSource1 is used for VDS. The ammeter willmeasure the ID current.

3. Click on Run > DCAnalysis . Sweep VDS from 0 to 10V and VGS from 0 to 2V

4. Click on “Run” to run the simulation and obtain the charactersitics

Conclusion

The characteristics have been plotted and you can find that they are similar to the common-collectorcharacteristics of a BJT.

JFET JFET BASICS

COMMON DRAIN CHARACTERISTICS

AimAim is to connect a JFET in the common-drainconfiguration and plot its characteristics

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