Mic Components

7/26/2019 Mic Components

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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

=


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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