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MMIC Design and Technology
Passive Elements
Instructor Dr. Ali Medi
Lecture 3 Passive Elements
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Capacitors
ransm ss on nes
Inductors Couplers
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NiCr
Bulk aAs
700 /sq
Figures from Text
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A
d=
FF
r
1512
=
mm0
..
.
What is C in pF/mm2
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Thin Dielectric layer to produce high values of capacitance
1200pF/mm
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ImRe += j
http://mcalc.sourceforge.net/
Retan
=
GaAs = 13
=tanr
0.0016 @ 10GHz
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c =
cc 0=
rIn GaAs
90 cmcsec
.13
m
At 10GHz f = 0.83 cm
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g=cm/f
u e v er r er e
Thin means H < 0.1
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1=
= Conductivity gold = 4.5 x 107 S/m
Hx
7104
=
Lecture 3 Passive Elements
m
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Current flows on inner surfaces
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From Text
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Ma re uire Electroma netic Solution
Some design equations available
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Consider 0.1 mm thick GaAs
Find W for 50 line
. mm
What is Zo of a line that has W=0.03mm and H=0.1mm
65
50 0.03mm
What is return loss of this structure on 0.1mm thick GaAs
Assume that the line on the right has infinite length.
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Pin 1
2
Pref
/4Pref = 0
Z Z
=
ZL
+ Z0
2 = - 1
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Lecture 3 Passive Elements