7.1 7.2 7.3 7.4

7

( Integrated circuitIC ) 7.1.17.1

7.1.2

1 2 3 4 5

7.1.3

(Differential Amplifier)7.2

7.2.1 UO=UC1UC2

1.

T1T2Rs1=Rs2Rb1=Rb2Rc1=Rc2

UI1=UI2 = 0UC1=UC2UO=0(1)

UI1=UI2 UIC =UI1 =UI2 UO=(UC1UC1)(UC2UC2) = 0(2)

UC1UC2UOC=0(Common-mode Gain)UOCUIC UC1+7.1

+Rs1+VCCUI1Rs2Rb1Rc1Rc2Rb2UC2UI2UO++___T1T2-

Auc=0Auc

UIB1B27.2UI=UI1 UI2++VCC+UO_Rb1Rc1UIUI1Rs1Rs2Rc2Rb2B1B2UI2++_+_T1T27.2

(3)

UIUIUIUI1=UI/2UI2=UI/2

/2/2

T1T2UI1UI2,UI(Difference-mode Signal)UIdUId=UI1UI2UI1UI2

UIUI1>0UC1

UC1=-UC2UO=(UC1+UC1)(UC2+UC2)=2UC1=2UC2

UI>0UO

2.

UOdUIdAud

7.3

Au1=Au2

(1).3. (3).,,.(2).

1. Re

7.2.2

TIC1IC2UBE2()IEQ+IEReIRe=2IEQ+2IE (IE1+IE2)URe=(IE1+IE2)ReUEUBE1IB1IC1IB2IC2

Re URe=(2IEQ+2IE)Re=(IEQ+IE)2Re 2Re7.5 2Re2Re

7.6UIC:

UICUIC

RLRL

ReReRe

, Re:

IE2+IE2Re2IEQReIE1+IE2IE1+IE1Re

2.T1T2 Rc1=Rc2=RcRs1=Rs2=Rs(1)

UI1=UI2=0IE1=IE2=IE 7.4 VEE=IBRs+2IER+UBE

IBRs

UBE+_ >> 1 IC1=IC2=ICIE UCE1 = UCE2 = UCE = VCC+VEE-ICRc-2IERc

(2)Reh7.7

RL RL/2 RL/2

RL/2

(3)Rid = 2(Rs + rbe)Rid

Rod = 2Rc

Rod

ReVEE

7.2.3

,ReiCiBuCE

iCrce>>RCE

7.8Re

(Constant Current Source)7.9

7.10D1D2UD=0.7VT1T2T3=50UBE=0.7V[7.2]

7.10

UC1 = UC2 = VCC-ICRc = 12-0.5710 = 6.3(V)RsREUC3UE1 = UE2 = - 0.7(V)UE3 = UB3 -UBE3 = -5.46-0.7 = - 6.16(V)UCE1 =UCE2 =UC1-UE1 = 6.3+0.7 = 7(V)

UCE3 =UC3 -UE3 = -0.7 + 6.16 = 5.46(V)

Ro = Rc = 20(k) Rid = 2[Rs + rbe + (1+)RE] = 2(2 + 2.6 + 510.1) = 19.4(k)

7.2.4

UI1UI2UId UId =UI1-UI2 UIC

UO =UOd+UOc = AUdUId + AUcUIC

UO:UOdUOcUO =UOd+UOc = AUdUId + AUcUIC

Auc0UOUOcAuc=0UO=UOd

(Common-mode Rejection Ratio KCMR):

KCMR

1.(Offset Voltage)(Offset Current) 7.2.5

7.11 7.12

UO=0 UI0 IB1IB2I'B1=IB1-IIO/2 =(IB1+IB2)/2 =IB2+IIO/2=I'B2UO=0U'I=0I'B1=I'B2IIO=IB1-IB2

IIOUO=0UIOUO=0

2.

7.13(a)RwIC1IC2UoRwIC1IC2Uo0Rw

7.13(b)RwRcUoRwRc1UC1Uo0

7.13c RwUB2T2UIOUo0

7.2.6 UId =UI1-UI2

Rid = 2(Rs+rbe) Rod = 2RcAuc=01.

2.7.14

123KCMR

(Rs1+rbe1)

3.7.16 UId =UI1-UI2

7.17

Auc=0

Rid = 2( Rs + rbe ) Ro = 2Rc

4.

Rid = 2 ( Rs + rbe )

Ro=Rc

7.3

7.3.1(Current Mirror Source)7.19T1T2 UB1=UB2IB1=IB2=IBIC1=IC2=IOIR

>>2VCC>>UBE

IRIOIRIO

IORUBE()R

7.3.2(Small Value Current Source)RIO

PN UBE>>UT

IS1=IS2

IR = IE1+IB2IE1IOIE2

IRIORRe2

7.3.3

T1IE1R1IE2R2IE3R3IE4R4

7.3.4 (Active Load)RcRe()

7.22T2T3rce3T1

7.23T3T4T1T2

UI=0IC1=IC2=IO/2T3T4IC1=IC4RLIL=IC4-IC2=0

UIiC1=IC1+IC1iC2=IC2+IC2IC1=-IC2IC4=IC1RL

IL=IC4-IC2 =IC1-(-IC1) =2IC1

7.4

7.4.1

F007(5G24F741)F007A7417-26

AOd

AOd(dB)=20lgAOdAOd107(dB) 7.4.2

UIO UBEUIO1mV

UIOUIOUIO0.5V/

IIB IIB

IIOIIO=IB1-IB2

dIIO/dTIIO(PA/)ridrid

KCMR KCMR160dB

UICmaxF00410VF00713V

UIdmaxroUOmaxUOmaxIOmaxIOmax

7.4.3

7-35

7.4.4