o2
ui
t
uo1
tuo2
t
VCC
RbC1
Rc
C2
Uo1

C3
Uo2
Ui
ReRL

UiRb

rbe
Re
Ib
Uo2
Uo1
Rc
f习题218P107
C1
C2
VCC15V
UiRe
RCRb2
Rb125k
RL
Uo
Rb210kRc3k
解：①
Rb1VCCCb
UBQ

Rb1Rb1Rb2
VCC
3V
Re
UBQUBEQIEQ
12k
②ICQIEQ2mAIBQICQ004mA40A
RL3kβ50
UBEQ06Vrbb’300IEQ2mA
UCEQVCCICQRcIEQRe66V
③
rberbb
Ri

rbe1
126IEQ
188
963Ro

Au

RcRLrbe
Rc3k
778
习题219P107解：a共基电路
b共射电路c共集电路d共射电路e共射－共基电路
f习题220
Rg
uI
VGG
P107
Rd
uO

iDmA
4
3
2VDD
1
iD
Q
uGS3V
2V
15V1V
05101520uDSV
解：①直流负载线方程：uDSVDDiDRd2051iD
UGSQ2VUDSQ83VIDQ23mA
②
gm

iDuGS
17mS
③AugmRd87RoRd51k
VDD20VVGG2VRd51kRg10M
习题221P108
①AugmRDRL225RiRGR1R220MRoRD15k
②不接CS时，微变等效电路为
R2Rd
C1Rg
Ui
R1Rs
VDDC2
RLUoCs
GD
Rg
Ugs
R1R2S
gmUgsRdRL
Rs
VDD30V
Rd15kRs1kRg20MR130kR2200k
RL1Mgm15mS
fGD
Rg
Ugs
R1R2S
gmUgsRdRL
Rs
UiUgsIdRs1gmRsUgs
UogmUgsRdRL
Au

UoUi


gmRdRL1gmRs

9
VDD30V
Rd15kRs1kRg20MR130k
R2200kRL1Mgm15mS
习题222P109
Rg
uI
VGGRsIDuO
UGSQVGGIDQRs
2
IDQ

IDO

UGSQUGSth

1
UGSth2V
IDO2mA
VDD20V
VDD
VGG4V
Rs47k
Rg1M
UGSQ273VIDQ027mA
gm

2UGSth
IDOIDQ0735mS
f微变等效电路
GS
uI
gmUgs
D
UogmUgsRs
RSuo
UGSth2VIDO2mA
VDD20VVGG4VRs47kRg1M
UiUgsUo1gmRsUgs
Au

UoUi
gmRs1gmRs
0776
习题223P109
解：①设UBEQ1UBEQ207，
IBQ1
VCC
UBEQRb
004mA
ICQ11IBQ12mA
Rb1C1
uI
设IBQ2ICQ2，则
UCEQ1VCCIRCQ1c138V
IEQ2
UCQ1UBEQ2Re2
41mA
ICQ2
IBQ2

ICQ22
014mA
ICQ1成立
UCEQ2VCCICQ2Rc2IEQ2Re237V
Rc1Rc2
VCC
VT1
VT2uO
Re2
VCC15VRb1360kRc156kRc22kRe2750β150β230
f②
rbe1

3001
1
26IEQ1

095k
rbe2

30012
26IEQ2
05k
Ri1Rb1rbe1095k
Rb1C1
uI
Ri2rbe212Re22375k
Au1


1Rc1rbe1
Ri2

2385
Au2
rbe2
2Rc212Re2
253
Au

Au1gAu2
rbe2
2Rc212Re2
603
RoRc22k
Rc1Rc2
VCC
VT1
VT2uO
Re2
VCC15VRb1360kRc156kRc22kRe2750β150β230
习题224P109
Rc1
Re2
VCC
VT2
uS
Rb
VT1
uO
Rc2
Ri
VEE
解：①uS0时，uC2uO0
ICQ2VEERc2364mA
IBQ2ICQ22018mA
140220
UBEQ107VUBEQ207V
VCC12VVEE12VRc139kRc233kRe22kRb200k
IEQ2IBQ2ICQ2382mA
UEQ2VCCIEQ2Re2436V
UCQ1UBQ2UEQ2UBEQ2366V
fRc1
Re2
VCC
VT2
uS
Rb
VT1
uO
Rc2
VEE
IRC1VCCUCQ1Rc1214mA
ICQr