Laborator 4 2020/2021rf-opto.etti.tuiasi.ro/docs/files/DCMR Lab 4 Online.pdf · 2020. 11. 23. ·...
Transcript of Laborator 4 2020/2021rf-opto.etti.tuiasi.ro/docs/files/DCMR Lab 4 Online.pdf · 2020. 11. 23. ·...
![Page 1: Laborator 4 2020/2021rf-opto.etti.tuiasi.ro/docs/files/DCMR Lab 4 Online.pdf · 2020. 11. 23. · Laborator 4 2020/2021 [S] ... Se schimba frecventele de lucru in schema 4 – in](https://reader036.fdocument.pub/reader036/viewer/2022071604/613f890df0f55d448e4cdb93/html5/thumbnails/1.jpg)
Laborator 4 2020/2021
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[S]
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Doua porturi in care adaptarea influenteaza transferul de putere
Pav S Pin Pav L PL
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Caracterizare cu parametri S Normalizati la Z0 (implicit 50Ω) Cataloage: parametri S pentru anumite
polarizari
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[S]
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Obtinem conditiile ce trebuie indeplinite de ΓL pentru a obtine stabilitatea
1in1
1 22
211211
L
L
S
SSS
1out 11 11
211222
S
S
S
SSS
Obtinem conditiile ce trebuie indeplinite de ΓS pentru a obtine stabilitatea
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Ecuatia unui cerc, care reprezinta locul geometric al punctelor ΓL pentru limita de stabilitate
Cercul se numeste cerc de stabilitate la iesire (ΓL)
22
22
2112
22
22
**1122
S
SS
S
SSL
22
22
**1122
S
SSCL 22
22
2112
S
SSRL
LLL RC
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Similar
Ecuatia unui cerc, care reprezinta locul geometric al punctelor ΓS pentru limita de stabilitate
Cercul se numeste cerc de stabilitate la intrare (ΓS)
1out
11 11
211222
S
S
S
SSS
22
11
**2211
S
SSCS 22
11
2112
S
SSRS
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Deseori este necesara o alta abordare decat "forta bruta" si se prefera obtinerea unui castig mai mic decat cel maxim posibil pentru: conditii de zgomot avantajoase (L3)
conditii de stabilitate mai bune
obtinerea unui VSWR mai mic
controlul performantelor la mai multe frecvente
banda de functionare a amplificatorului
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Adaptarea pentru castig maxim la doua frecvente genereaza o comportare dezechilibrata
[dB]
log(f) f1 f2
MAG MSG
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Adaptare pentru castig maxim la frecventa maxima Dezadaptare controlata la frecventa minima eventual la mai multe frecvente din banda
[dB]
log(f) f1 f2
MAG MSG
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Daca ipoteza tranzistorului unilateral este justificata:
2
22
2
2
11
22
211
1
1
1
L
L
S
STU
SSSG
2
11
2
1
1
S
SS
SG
2
22
2
1
1
L
LL
SG
2
210 SG
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Daca ipoteza tranzistorului unilateral este justificata: castigul adaugat prin adaptare mai buna la intrare nu
depinde de adaptarea la iesire
castigul adaugat prin adaptare mai buna la iesire nu depinde de adaptarea la intrare
Adaptarile la intrare/iesire pot fi tratate independent Se pot impune cerinte diferite intrare/iesire
se tine cont de compunerea castigurilor generate
LST GGGG 0 dBGdBGdBGdBG LST 0
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2
11
2
1
1
S
SS
SG
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5.1SG
0.1SG
5.0SG
Cercuri
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2
11
2
1
1
S
SS
SG
*11
max SSSS
GG
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2
11
2
1
1log10
S
SS
SdBG
*11
max SSSS
GG
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Ecuatia unui cerc in planul complex in care reprezint ΓS
Interpretare: Orice punct ΓS care reprezentat in planul complex se gaseste pe cercul desenat pentru gcerc = Gcerc/GSmax va conduce la obtinerea castigului GS = Gcerc Orice punct in exteriorul acestui cerc va genera un castig GS < Gcerc
Orice punct in interiorul acestui cerc va genera un castig GS > Gcerc Discutie similara la iesire CCCIN, CCCOUT
2
11
2
11
2
11
*11
11
11
11 Sg
Sg
Sg
Sg
S
S
S
SS
SSS RC
2
11
*11
11 Sg
SgC
S
SS
2
11
2
11
11
11
Sg
SgR
S
SS
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Cercurile se reprezinta pentru valorile cerute in dB Este utila calcularea GSmax si GLmax anterior
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Factorul de zgomot F caracterizeaza degradarea raportului semnal/zgomot intre intrarea si iesirea unei componente
oo
ii
NS
NSF
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Cercuri
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Γopt = 0.45 174°
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Amplificator de zgomot redus La intrare e necesar un compromis intre
zgomot (cerc de zgomot constant la intrare)
castig (cerc de castig constant la intrare)
stabilitate (cerc de stabilitate la intrare)
La iesire zgomotul nu intervine (nu exista influenta). Compromis intre:
castig (cerc de castig constant la iesire)
stabilitate (cerc de stabilitate la iesire)
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Daca se sacrifica 1.2dB castig la intrare pentru conditii convenabile F,Q (Gs = 1 dB)
Se prefera obtinerea unui zgomot mai mic
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CCCOUT: -0.4dB, -0.2dB, 0dB, +0.2dB Lipsa conditiilor privitoare la zgomot ofera posibilitatea
obtinerii unui castig mai mare (spre maxim)
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De obicei un tranzistor potrivit pentru implementarea unui LNA la o anumita frecventa va avea cercurile de castig la intrare si cercurile de zgomot in aceeasi zona pentru ΓS
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Daca ipoteza tranzistorului unilateral este justificata:
2
22
2
2
11
22
211
1
1
1
L
L
S
STU
SSSG
2
11
2
1
1
S
SS
SG
2
22
2
1
1
L
LL
SG
2
210 SG
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0.2 0.5 1.0
+0.2
45°
315°
+0.5
+1.0 +2.0
-0.2
-0.5
-1.0
-2.0
2.0 0°
90°
135°
|Γ|=1
180°
225°
270°
V0
Z0 ZL
ΓL Zin,Γ0
1010 jXjRZ LLL
5.156678.0L
500Z
j·X1
2.02.0 jxjrz LLL
1xxjrz LLin
11 XXjRXjZZ LLLin
Lin rr 0/ 011 ZLjxj
0/ 011 ZCjxj
011 / ZLjxj
011 / ZCjxj
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0.2 0.5 1.0
+0.2
+0.5
+1.0
+2.0
-0.2
-0.5
-1.0 -2.0
2.0
0°
90°
135°
225°
270°
V0
Z0
YL
ΓL Γ0
5.23678.0L
SYZ 02.0,50 00
315°
180°
|Γ|=1
45° j·B1
SjSBjGY LLL 004.0004.0
2.02.0 jbjgy LLL
1bbjgy LLin
11 BBjGBjYY LLLin
Lin gg 0011 ZCjbj
0/ 101 LZjbj
101 / LZjbj
011 ZCjbj
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Zona interzisa cu schema curenta
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Zona interzisa cu schema curenta
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Zona interzisa cu schema curenta
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Zona interzisa cu schema curenta
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Zona interzisa cu schema curenta
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Pentru orice ΓL exista cel putin 2 retele in L de adaptare posibile (L+C)
Pentru anumite zone de start de pe diagrama Smith exista 4 posibilitati (+2 retele C+C/L+L)
Se alege reteaua care necesita componente de valori realizabile
Prin adaugarea elementelor rezistive se pot suplimenta retelele posibile cu pierdere de putere (nerecomandat)
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Partea a II-a
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Se scrie de mana de 100 de ori pe o foaie de hartie:
Promit solemn sa citesc SI textul si sa nu sar din poza in poza
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Se preia din interfata de examen de pe rf-opto tema personala
frecventa de lucru - f0 [GHz]
factor de zgomot - NF [dB] (maxim, orice valoare mai mica e mai buna si de dorit cat mai mica posibil)
castig de putere – G [dB] (minim, orice valoare mai mare e mai buna si se accepta)
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se schimba frecventa de lucru in schema 1 – fo si se realizeaza simularea
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se verifica valorile din tabel (din care unele obtinute din ecuatii!)
se verifica ca tranzistorul poate indeplini tema (altfel se alege un alt tranzistor)
NFmin < NF
MAG > G
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se verifica valorile din tabel (din care unele obtinute din ecuatii!)
Pentru obtinerea castigului impus se aleg valorile suplimentare necesare (suplimentar la G0)
dBGdBGdBGdBG dorLdorSdorit _0_
maxmax __ GLdBGGSdBGNFdBG dorLdorSdorit
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in schema 1 se schimba valorile dorite pentru cercuri (in loc de {1,2,3} se pun valori in jur de GSdor, GLdor, NF) – toate valorile in dB
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se reprezinta familii de cercuri si se verifica ca sunt in pozitii potrivite
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se schimba frecventa de lucru in schema 2 – fo si se realizeaza simularea
Analizand rezultatele din schema 1 se alege cate un singur cerc tinta:
stabilitate (intrare/iesire)
castig (intrare GSdor/iesire GLdor)
zgomot (intrare NFdor)
Afisarea cerurilor nu e necesara
cercurile vor fi utilizate efectiv in schema 3
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Chiar daca nu sunt afisate, schema 2 calculeaza cercurile (pentru tranzistor)
3 intrare (stabilitate/castig/zgomot)
2 iesire (stabilitate/castig)
E recomandabil sa se utilizeze rezerva
Gdor > G
NFdor < NF
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se schimba frecventa de lucru in schema 3 – fo si se realizeaza simularea
Se utilizeaza cercurile calculate in schema 2 ca “tinta”/indicator
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Se regleaza (tune) elementele din retelele de adaptare pentru atingerea punctelor dorite
Calculat in schema 3 Calculate in
schema 2
INTRARE – L1, C1
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Se regleaza (tune) elementele din retelele de adaptare pentru atingerea punctelor dorite
Calculat in schema 3 Calculate in
schema 2
IESIRE – L2, C2
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Daca nu se reuseste deplasarea punctului in pozitia dorita – cel mai probabil pozitia dorita e in zona interzisa pentru schema utilizata
se schimba schema utilizata (LC/CL, serie/paralel etc)
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Se introduc componentele gasite in schema 3 ca retele de adaptare la intrare/iesire pentru tranzistor in schema 4 (valori si schema!)
Se schimba frecventele de lucru in schema 4 – in jurul lui fo (fo in centrul intervalului)
Determinate in schema 3
Determinate in schema 3
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Se regleaza elementele din retelele de adaptare pentru o caracteristica mai convenabila
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componentele de la intrare influenteaza si castigul si zgomotul se regleaza mai intai, separat, urmarindu-se
indeplinirea conditiilor de zgomot cu acceptarea deteriorarii caracteristicii de castig (in anumite limite)
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componentele de la iesire influenteaza numai castigul
se regleaza separat urmarindu-se corectarea caracteristicii de castig (eventual deteriorata in urma optimizarii zgomotului)
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Se obtine comportamentul schemei finale cu verificarea indeplinirii temei: Castig (de putere) – mai mare ca cel din tema, cu rezerva
(0.5, 1, 2 dB) dar nu se sacrifica zgomotul pentru a-l creste excesiv
Caracteristica trece banda centrata pe fo e de dorit (macar una din retelele de adaptare trebuie sa fie de tip FTS)
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Se obtine comportamentul schemei finale cu verificarea indeplinirii temei:
Factor de zgomot – cat mai mic posibil, cu cat e mai mic cu atat e mai bine
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Laboratorul de microunde si optoelectronica http://rf-opto.etti.tuiasi.ro [email protected]