TF EIMLab17 Writeup

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The JFET (Junction Field Effect Transistor n-channel)

JFET MPF102 Pinouts.png

File:JFET MPF102 DataSheet.pdf

1.) Complete the table below for the JFET.

Only [math]R_D[/math] is not know. If we want currents up to 5 mA using a 10 Volt power supply then [math]R_D[/math] should be 2 k[math]\Omega[/math]

Parameter Value
[math] I_{DSS}[/math] 2 - 20 mA
[math]V_{GS(off)}[/math] -8 Volts
[math]P_{max}[/math] 350 mW
[math]R_G[/math] 3.3 M[math]\Omega[/math]
[math]R_D[/math] 1k \Omega
[math]y_{fs}[/math] 1600-7500 [math]\mu[/math]mhos
[math]y_{is}[/math] 800 [math]\mu[/math]mhos
[math]y_{os}[/math] 200 [math]\mu[/math]mhos

2.)Construct the JFET circuit below.

TF EIM Lab17Circuit.png

3.)Plot measurements of [math]I_D[/math] -vs- [math]V_{DS}[/math] by varying [math]V_{dd}[/math] for [math]\left | V_{GS}\right |[/math] = 0, 0.5, 1.0, 1.5 V. (40 pnts)

4.)Plot[math] I_D[/math] -vs- [math]V_{GS}[/math] (30 pnts)

5.)Calculate [math]y_{fs}[/math] for your JFET (20 pnts)


  1. Does [math]y_{fs}[/math] depend on[math] I_D[/math]? (10 pnts)