1-4 The 2N5486 JFET has the following maximum ratings: gmO = 8000 mu s and VGS(e
ID: 2989010 • Letter: 1
Question
1-4
The 2N5486 JFET has the following maximum ratings: gmO = 8000 mu s and VGS(eff) = -6 Volts. Using these values, determine the values of gm at Vgs = -2 Volts and Vgs = -4 Volts. For a JFET amplifier you need to determine the maximum and minimum values of the amplifier voltage gain Ay . Assume that we are using 2N 5459 that has values of gmo = 6000 ps at VG$( f) = -8 Volts and gwo = 2000 ps at = -2 Volts. The values of Rd and Rl are 8.2 KO and 100 KO respectively. A JFET has parameters of Vgs(Explanation / Answer
1) gm = gm0 (1-(vgs/vp))
when vgs = -2;
gm = 8*10^-3 * (1-2/6)
= 5.33*10^-3
when vgs =-4V
gm = 8*10^-3 * (1-4/6)
= 2.67*10^-3
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