How did they get this equation
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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How did they get this equation?

Transcribed Image Text:DC bias calculation
common source NMOS FET amplifier
VDD
VDD = 5 V, R, = 10k, R, = 16k,
R1
Rp
Rp = 43k, Rs = 24k. V = 0.78 V, VA = 30 V and B = 0.15 mA/V2
M1
D
R..
IG =0=> V = VDD
=5*(16/(10+16)) = 3.1 V
R, + R,
R2
Rs
In saturation:
Ips =
(Vos-V,) where Vos = VG - Vs.
2
Vss 0 V
IpS
Von -Io R
VDD
-v=110u±50µ€60µor160u
R, + R,
lo = VA/IDS = 30/60µ = 500 k.
%3D
60µ*43k 2.58 V
%3D
VDD- VD
%D
VDD- VD = 160µ*43k = 6.88 V
Check: We have Vps = 2.42-1.44 = 0.98 V and VGs = 3.1-1.44 =
1.66 V. Therefore, VGs- V = 0.88 V, so Vps > VGs - V. The
MOSFET is in saturation, as required.

Transcribed Image Text:Nd s =
5 43+243xo-Os8
vds > Vou
Hence mos FET is in
sa turation.
our assuomp6mis coos et
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