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Microwave Amplifier Design
1
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Microwave Amplifier Diagram
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Gain Definitions
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Cont’d
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After a few manipulations, we have:
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Source Mismatch Factor
5
P
T
AVS
ins G
GPP
M
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Load Mismatch Factor
6
A
T
AVN
LL G
GPPM
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Example#1
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![Page 8: Microwave Amplifier Design - KNTU · Microsoft PowerPoint - Slide6.pptx Author: dr shamsi Created Date: 12/10/2016 11:58:01 AM](https://reader033.vdocuments.net/reader033/viewer/2022060505/5f1e2402f5d142049117bad3/html5/thumbnails/8.jpg)
Cont’d
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![Page 9: Microwave Amplifier Design - KNTU · Microsoft PowerPoint - Slide6.pptx Author: dr shamsi Created Date: 12/10/2016 11:58:01 AM](https://reader033.vdocuments.net/reader033/viewer/2022060505/5f1e2402f5d142049117bad3/html5/thumbnails/9.jpg)
Cont’d
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Stability Consideration
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Cont’d
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Stability Circle in the Smith Chart
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Stable and Unstable Regions in ΓL Plane
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Stable and Unstable Regions in Γs Plane
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Conditions for Unconditional Stability
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Example#2
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For f=500 MHz, we have:
For f=1 GHz, we have:
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Cont’d
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Γs Plane
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Cont’d
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ΓL Plane
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Stability Consideration
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A straightforward but somewhat lengthy manipulations result in the following necessary and sufficient conditions for unconditional stability:
Stern’s stability factor:
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Example#3
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Cont’d
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Example#4
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Cont’d
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Cont’d
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Improving Stability
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Unilateral Transistor: S12=0
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In a unilateral case we have:
![Page 27: Microwave Amplifier Design - KNTU · Microsoft PowerPoint - Slide6.pptx Author: dr shamsi Created Date: 12/10/2016 11:58:01 AM](https://reader033.vdocuments.net/reader033/viewer/2022060505/5f1e2402f5d142049117bad3/html5/thumbnails/27.jpg)
Cont’d
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Maximum Achievable Gain(Unilateral Case: S12=0)
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Bilateral Transistor(S12≠0)
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Solving above equations, Γs and ΓL are obtained:
It is proven maximum gain is obtained when simultaneous conjugate match exists.
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Maximum Achievable Gain (Bilateral Case: S12≠0)
30
It is proven that:
The maximum stable gain is defined as the value of GTmax when K=1. Namely,
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Example
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BJT Bias Network
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BJT Bias Network
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GaAs FET Bias Network
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GaAs FET Bias Network
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GaAs FET Bias Network
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GaAs FET Bias Network
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