JFET common drain characteristics

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Information about JFET common drain characteristics
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Published on February 4, 2014

Author: docircuits

Source: slideshare.net

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Lab Manual at www.docircuits.com - JFET common drain characteristics

Access this lab-manual at: http://www.docircuits.com/lab-manual/15/jfet-common-drain-characteristics JFET Common Drain Characteristics Aim Aim is to connect a JFET in the common-drain configuration and plot its characteristics Related Experiments JFET JFET BASICS COMMON DRAIN CHARACTERISTICS Description The basic circuit for the common-drain configuration or the source follower configuration is shown. As is evident from the figure no resistor is connected in series with the drain terminal. The voltage across resistor RS provides the 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, low output 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 will measure 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-collector characteristics of a BJT.

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