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Determine IDQ, VGSQ, VD & VS for the network given below.

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Mumbai University > Electronics and telecommunication engineering > Sem 3 > Analog electronics 1

Marks: 10M

Years: May 15

1 Answer
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Calculation for Rth and VG:

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Calculation for VG:

VG=(VDDXR2)(R1+R2) = (16X270X103)(2.1X106+270X103) = 1.822 V

VG = 1.822 V

The reduce circuit as shown in fig 5.6.

enter image description here

Calculation for IDQ, VS and VGS:

IS=ID+IG

Since IG0

Hence ISID

Applying KVL to gate-source node we get

VGVGSIDRS=0

VGS=VGIDRS

Now, ID=IDSS(1VGS/VP)2

By Substituting,

ID=8m(1(1.8221.5kID)(4))2

After Simplification,

ID=16.9475X10(3)8.733ID+1.125X103I2D

Hence,

ID1=6.223X10(3) and ID2=2.415X10(3)

FET is in pinch off region and ID=0 at pinch-off region.

Hence, IDQ=ID2= 2.415mA

And VGSQ = -1.8V

VS=VGVGS

= 1.822 – (-1.8)

=3.622

Hence,VS= 3.622

Calculation for VDSQ:

Now, Applying KVL to drain-source channel

VDDVDSIDQ(RS+RD)=0

162.415X10(3)(2.4X103+1.5X103)=VDSQ

VDSQ = 7.306V

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