*CHNG 1:T/H V CC B KSignals and AmplifiersGing vin: TS. Nguyn Phng HuyB mn K thut in tKhoa in tTrng H K thut cng nghip*

Ni dung chnhTn hiuPh tn ca tn hiuTn hiu s v tng tKhuch i tn hiuM hnh mch khuch ip ng tn ca mch khuch iPhn hi trong b khuch i

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Tn hiu- Tn hiu (signal) dng ch mt i lng vt l mang tin tc. V mt ton hc, ta c th m t tn hiu nh l mt hm theo bin thi gian, khng gian hay cc bin c lp khc VD: x(t ) = 20t2 s( x, y) = 3x + 5xy + y2

X l tn hiu (signal processing): Cc cng vic hay cc php ton c thc hin trn tn hiu nhm t mt mc ch no Khi nim**

Tn hiuTn hiu tng t v s**

Tn hiuTn hiu in p bt kM t tn hiu**

Hai cch khc nhau khi th hin ngun tn hiu(a) Dng Thevenin (b) Dng Norton Tn hiuM t tn hiu**

Ph tn Tn hiuGii thiuJean Baptiste Joseph Fourier (1768-1830)**

Ph tn Tn hiuGii thiuTn hiu in p hnh sin vi bin Va v tn s f = Hz, v T l chu k n v l giyBt c tn hiu tun hon no cng c th c biu din di dng tng ca cc hm sin, cos ca cc tn s khc nhau **

g(t) = sin(2pi f t) + (1/3)sin(2pi (3f) t)= +Ph tn Tn hiuV d**

V dTn hiu xung vung i xng c bin V v ph ca nPh tn Tn hiu**

V dPh tn Tn hiuTn hiu v Ph tn ca dng sng bt k**

V dPh tn Tn hiu**

Tn hiu s v tng t- H thng tng t- H thng s- Cng ngh sx(t)y(t)x(t)y(t)x(nTs)y(nTs)x(nTs)y(nTs)Gii thiu**

Tn hiu s v tng tADCLy mu tn hiu tng t lin tc trong hnh (a) Kt qu l tn hiu ri rc hnh (b)**

Tn hiu s v tng tADCLng t ha**

Tn hiu s v tng tADCM ha - S bin i ca tn hiu s nh phn theo thi gian1 00012 00103 00114 01007 011114 111015 111111,4V**

Khuch i tn hiuKhi nimBin i nhng tn hiu c cho l tng i yu, tc l trong khong microvolt hay milivolt (mV) v vi nng lng nh thnh tn hiu c bin ln hnK hiuK hiu mch in b khuch i (a) b khuch i vi mt tip im chung (t) gia cng vo v cng ra**

Khuch i tn hiuH s khuch i- H s K in p:- H s K dng:- H s K cng sut:Tnh theo Decibel**

Khuch i tn hiuTuyn tnh v mo phi tuynNu t l khuch i l khng i i vi cc u vo trong mt s di th b K c gi l tuyn tnh trn di Bt k thay i no trong dng sng u c coi nh s mo dng v tt nhin l khng mong mun**

Khuch i tn hiuCp ngun cho b khuch iHiu sut K:**

Khuch i tn hiuBi tp**

**Khuch i tn hiuTrng thi bo ha ca b khuch i

Khuch i tn hiuBi tp**

**Khuch i tn hiuc tnh truyn t phi tuyn v s phn cc

**Khuch i tn hiuQuy c k hiuCc i lng tc thi k hiu bng mt ch in thng vi ch s di dng vit hoaCc i lng mt chiu s c k hiu bng k hiu ch in hoa vi ch s di dng vit hoaCc i lng tn hiu bin thin theo thi gian s c k hiu bng mt k hiu ch in thng vi ch s di dng vit thng

**M hnh mch in b khuch iB K in pKL: B K in p phi c tr khng vo ln, tr khng ra nh!

**M hnh mch in b khuch iCc B K khcKhuch i dng inKhuch i in pKhuch i chuyn i in pKhuch i chuyn i dng in

**M hnh mch in b khuch iB khuch i ghp tng p ng nhng c im k thut ca b khuch i cho trc ny sinh yu cu phi thit k mt b khuch i gm hai hay nhiu tng. Mi tng c thit k p ng mt mc ch c bit

**p ng tn s b khuch iXc nh p ng tn sp ng ca b khuch i p ng bin hay lnp ng phaThc t:

**p ng tn s b khuch iDi thng ca b khuch iH s khuch i ca b khuch i trong di tn s ny thng l c nh, vi mt s c th trong phm vi vi decibel(thng l 3dB), c gi l bng thng ca b khuch i.

**p ng tn s b khuch iH thng STC (hng s thi gian duy nht)Hai v d v h STC : (a) h thng thp (b) h thng cao

**p ng tn s b khuch iH thng STC (hng s thi gian duy nht)(a) p ng ln v (b) p ng pha ca h thng STC dng thng thp(a) p ng ln v (b) p ng pha ca h thng STC dng thng cao

**p ng tn s b khuch iH thng STC (hng s thi gian duy nht)Phn loi cc b khuch i da trn p ng tn s

**Phn hi trong b khuch iGii thiuKhng c mch in t no hot ng tt m khng c mt vi dng phn hi.Phn hi mGim h s khuch i Gim mo phi tuyn Gim nh hng ca nhiuiu khin c tr khng vo v raM rng bng thng ca b khuch i tng c bn ca phn hi m l gim h s khuch i t c cc mc tiu trn Phn hi dng s to ra dao ng trong b khuch i

**Phn hi trong b khuch iGii thiuS khi tng qut ca b khuch i c phn hi

*Mch chia thnh vng kn v vng hH s khuch i vng kn

H s phn hi H s khuch i nhnh phn hi: ATng phn hi (1+ A)Phn hi trong b khuch i

*Phn hi trong b khuch iPhn loivoltage-mixing voltage-sampling (seriesshunt)current-mixing current-sampling (shuntseries) voltage-mixing current-sampling (seriesseries) current-mixing voltage-sampling (shuntshunt)

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