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Title: 6 Author: Sun Weiqiang Last modified by: Weiqiang Sun Created Date: 11/29/2005 7:19:56 AM Document presentation format – PowerPoint PPT presentation

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Title: ????


1
??????(?15?)
  • ??
  • ????
  • ?16?
  • ???
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  • ?17?
  • ??/????
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  • ?18?
  • ??
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  • 1?24???

2
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  • ???

???????????6?,??????????????????http//front.sj
tu.edu.cn/sunwq/dc06/
3
????
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4
??????(Schmitt Trigger)
VIN2.5VVTH
??????G1??????,????
??????G2??????,????
????????????
??G1????????
5
??????(Schmitt Trigger)
VINVTH
????????????
??G1????????, ????????????
????????????
6
??????(Schmitt Trigger)
VINVTH
????????????
??G1????????, ????????????
????????????
?G1?G2?????,vI?????VTH Vo?0,??
vIR2VTH/(R1R2)
VT
???????????
7
??????(Schmitt Trigger)
VINVTH
????????????
??G1????????, ????????????
????????????
?G1?G2?????,vI?????VTH Vo?1,??
VT-
???????????
8
??????
  • ???????????????
  • ????VT?????,??????
  • ???????????????
  • ????VT-?????,??????

???????!
VTR2VTH/(R1R2)
VT- VT-VDDR1/R2
9
?????????????
VTR2VTH/(R1R2)
VT- VT-VDDR1/R2
VT
VT-
10
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  • TTL????????????
  • ????????

????
11
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12
(No Transcript)
13
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  • 555???????

14
??????
  • ?????????
  • ??????(????????)
  • ?????????????????????
  • ???RC???????????

15
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????????RC??
16
????
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17
?????
?????6tpd
18
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19
????
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20
555???????
?????SR???
21
555???????
  • ????
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?????VI
?VIgtVI-?,??1 ?VIltVI-?,??0
VI- ?????
???????? ????????
  • ????

b??? ????? c??
b???? ?? ?e
b???? ?? ?e??
22
555???????
?VCO???????2/3Vcc
RS??? RS??? ?? ??
RD vI1 vI2 S R vo TD??
0 x x x x ? ??
1 gt2/3Vcc gt1/3Vcc 1 0 ? ??
1 lt2/3Vcc gt1/3Vcc 1 1 ?? ??
1 lt2/3Vcc lt1/3Vcc 0 0 ? ??
1 gt2/3Vcc lt1/3Vcc 0 1 ? ??
?VCO???????1/3Vcc
23
?555???????????
2/3Vcc
1/3Vcc
24
?555???????????
tw
2/3Vcc
tw???RC???
??????vo0
25
?555??????????
26
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  • Digital Fundamentals
  • ?8?34?35
  • ??????(??)
  • ?6?6.29 (?6????????)
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