ʱ : ڶ 通信电路(第二?课后习题答案-沉伟慈编着 - 百度文库ϿʼĶ
2???C1????gie?gie?2?C1???C1?C2??????gie?gie 2?C2??C2????????gie?gie?C1?C2??
&yU&g&&&&&FFUUFUfei?fC1&T??C2???&&&&UiUiUiUiΪҪ
У
g?1?yfe???goe?geo&&FF?C?C21??goe??1?&?FC2???0.73mS&T?1??gie???2?12?C1????Qo?0LC?2??gie?
??Ŀ|yfe|=20.6mS֪˵·
45 ͼʾ·ƵΪf0=50MHz佻Ч·L
⣺Ч· 8.2p8.2p2.2p1k20p4pL3.3p15p(a)
17
C?115?2.2?4?3??12.6p11115?2.2?? 8.28.2201L??0.8uH224?fC46ͼʾ·
1ƵЧ·˵ͣ 2Ƶʡ
⣺ͼa
57u3.3p˵·Ϊʽ·ƵΪ
15k//5.1k2.2p15p8.2p5101C??3.3?4.85p111??8.22.215
1f??9.58MHz2?LC ͼb
(a)50u68~125P1000p470u32k//20k1000p(b)1?60p111??10001000681Cmax??100p111˵·??100010001251f3??2.91:2.25MHz2?LCCmin?18
гƵʣ50uHɱγɵĴгƵf1470uH1000pFݵIJгƵf2,1000pFɱݺ50uHдγɵг·гƵf3ֻf3 f1 f2˵·ʽ·Ҫ潻Ч·пɿģ˴˵·Ϊʽ·
47 ͼʾ·УLCг·гƵʷֱf1?1/(2?L1C1)
f2?1/(2?L2C2) Էֱ·Ƶf0f1 f2֮Ĺϵ˵·͡
⣺1ͼaȻֻܹɵʽ·ʽ·ɷ˵·ܷ伫֧·ΪԣԲг·ֻƵʵгƵʲűΪԣͼaУf0f1 f2
2ͼbȻֻܹɵʽ·ʽ·ɷ˵·ܷ伫֧·Ϊԣһ֧·ΪԡԲг·ֻƵʵгƵʲűΪԣƵʸгƵʲűΪԡͼbУf2f0f1
49ͼ4.9(a)(b)ֱΪ10MHz25MHzľԻЧ·˵ڵ·еã㷴ϵ
⣺ͼaĽЧ·
8/30pF?150pUbeIXbe?UcbI(Xbe?Xce)20p1300?1300?1150?11500 5??0.3116ͼbĽЧ·
300p5.6k//10k1500p(a)
19
43pUbeIXbeF??UcbI(Xbe?Xce)1270?1270?1433.9k270p
L43??0.14313
410ԻͬʱҪһʵþ·
(b)1NPNܣ
2гΪԪ
3ce֮ΪLC· 4ܷ伫ӵء ⣺·ͼʾ
UccRb1C1Rb2ReCeC2(a)
412Խгȷؽͼʾ·Уɲͻ;·
UeeUccReRb1RbCbC1C1CbRb2LC3C2ReC2L(a)(b) ⣺aͼɹɵĵ·
20