高频电子线路课后习题答案(第五版)张肃文(5)

4 7解：gb e

gm Cb e

IE1

0.754 mS

26β0 126 50 1β0

50 0.754 10 3 37.7 mS rb e

gm37.7 10 3 24 pF 6

2πfT2 3.14 250 10

a 1 rbb gb e 1 70 0.754 10 3 1b ωCb erbb 2 3.14 107 24 10 12 70 0.1yie

gb e j Cb e a jb 0.754 10 3

a2 b2

0.895 j1.41 mS

j2 3.14 107 24 10 12 1 j0.1

12 0.12

j2 3.14 107 3 10 12 1 j0.1 yre 0.0187 j0.187 mS 2222

a b1 0.1

gm a jb 37.7 10 3 1 j0.1 yfe 37.327 j3.733 mS a2 b212 0.12

g j Cb c a jb j C 1 rga jb

yoe gce j Cb c rbb gmb c b c bb m

a2 b2a2 b2

1 j0.1

j2 3.14 107 3 10 12 1 70 37.7 10 3 2 0.049 j0.68 mS 2 1 0.1

Av

4 8解：令 A

vo

Av 令 A vo

mm

g j Cb c a jb b c

4 Q2Δf4 Q2Δf

2

0.7

f04

1 2

m

得2Δf0.7

1 m f0

4 2 1 Q

2

0.1

f04

1 10 10 12 1

1m2m

m

得2Δf0.1

2 m f0

4 10 1 Q

故Kr0.1

2Δf0.1

2Δf0.7

2 m

4 1

1 m 4 2 1