Analog To Digital Converter.

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ó ҹѲ 37053741 
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úѭ

          ѭҳػóŤԤ 2 Դ ѭҳ͹͡ ѭҳԨԵ ѭҳ͹͡ ػó Ǻ
          Ѩغѹ ͹ Ǻػóҧ ҡ Ǻ Ǵ Ǻ ͧ ѭҳԨԵԴ͡Ѻ ͹  ԧ ѭҳ͹͡Ǻ ѧ֧ ͧ¹ѭҳ͹͡ ѭҳԨԵ ֧ѭҳ ͹ Ǻк
          ѭҳ͹͡͹ ٧ ѭҳ͹͡Ǻҡ ͧҡҾǴ ѭҳúǹҡ  Ǻ͡ öǺ ҡѺǺẺԨԵŹ ҡ ͧҡǧǺẺ ͹ͧ͡Ѻ͹٧
          ҧ ѭҳԨԵšö´ͧѭҳ͹͡ҧó Ǻ дǡ

Counting Converter
          Counting Converter Ը·شͧŧѭҳ͹͡ ѭҳԨԵ š Ѻ ҡѺººѺͧ ѡɳҹѧٻ

          ҡǧ  Counter ػóѺ˹ D/A Reset Ѻѭҳ Reset ͧѺ
          D/A ѺѺ˹ҡѺ ŧѭҳ ͹͡ҧѡ ˹ ػóºº(Comparator)
          Comparator ػóººҧѡ ͧԹص ҡѺ ҡͧѭҳѹҧѡ 0 ŵ͡(ͨԡ 0) ѹҧѡ 0 ŵ͡(ͨԡ 1)
          ҧѡ͡ ͨԡ "" Ѻ ѭҳԡ ͨԡ͡ Ѿ͡ѭҳԡʴѧѾͧ ѭҳԡѺѺ ѾԨԵŷͧ ҡ ººҧѡ 0 (ͨԡ 0) ͨԡ "" Ѻѭҳԡ ͨԡ 0 ѺѺա ҴԨԵŨҡѺͧ
          ҡ͸Ժҧҿͧ V0 ѧ

          ͧԸ ѺͧѺ 0 Ѻ ҷص delay ֧ ֧¹ѺѺŧ ҧԧдѺҡдѺ ͧѺ 0 ¹Թص ҧԧѺѾ Ѿ

Successive Approximation
          ѡͧ "binary search" ͺ ѾººѺҧͧǧ Һ ҡ Ѻǧŧ ººѾѺҧͧǧ Ѿͧ Ţͺ 3 ҡǧͧͺ 0-7 á (0+7)/2  = 4  ºº ͺͧǧ 2 ͡ (0+4)/2 = 2 ºº ͺͧǧҡ 2 4 3 ͡ (2+4)/2 = 3 ºº ͺͧ
          ҡѡҨ¹ flow chart ѧ

 

          ͧԸ ͺ n ͺ ͹ (Ѻ n bit converter ҧԧ 2n дѺ дѺ Vin ) Ẻ "Counting Algorithm"
          Vin ¹ѹѹ ѧ binary search ͺԴҴ ҧ ¹ Vin ҡ 5 Volt 2 Volt

 
ǧͧ Vin 1-7 n=3 ( 23=8)
          á 4 ºº Vin (ҡ 5 ŵ) ǧ lower 1xx
          2   2 ºº Vin (ҡ 5 ŵ) ǧ upper 10x
          3   3 ºº Vin (ҡ 5 ŵ) ѾԴҴ 100

Dual-Slope ADC
          ѡͧǧ Integrater ҹѺ Comparater ѧٻ

          Input Voltage 2 ҧѡ͹ͧ͡ŧ繴ԨԵ (-Vin) ҧѡ˹ (Vref) Ե SW1 ˹͡ѭҳ
          ҡǧ͹Ե SW2 ˹ШͧШ C ֧Դ SW2 ͡
          Ե SW1 Ѻ -Vin ҡǧ Intergrater ٨ѧ

 
 
 
 
 

slope ҡѺ 
t          tm
t ҡٹ֧     tm      SW1 Ѻ Vref
 
 slope  
  ǧҧѡ  tm  ҧѡ 0 ҡ tn
 ѧʴҿ

 
          ҡѡͧ  
          ͧҡ Vref tn ѭҳ͹͡鹡Ѻ tn Ǻ¹ѭҳԨԵ 鹡Ѻ tn
          ŧѭҳԨԵŨѺ tn Ѻҵص ˹ Ѻ Vref  ͹ºҧ
          ͧŧѭҳ Vin Slope ͧǧ integrater
          ҵ ѡɳͧººͧ ش ҧͧҧѡ V ŵ ԹصͧŧǴ Vref ҧͧҧѡԴҡºº ѹ tm ҹҡ ҧѡԴҡºº ֧ͧҧѡ Vref Ѿ ѧٻ
 
          ҡǧѧҿѧٻ

Flash Converter

          ѡͧ Flash Converter çѹ Voltage ºº Vin ѹ logic  ҡٻ Voltage ºº 8 bit
          ҧѡ ҡҹҹ ҧѡ ºº Vin ҡͨԡ͡ ҡͨԡ 1 ѹͨԡ 0
          Ը Flash Converter ش ػó Hardware ҡ
 

ػ

          ŧѭҳ͹͡ ѭҳԨԵ ªҡǺػóԵ ѡɳŧѭҳԸ Ըš Ǵҹ ػóÎҧѹ  Ҵ Ҥҧѹ 鹡Ѻͧͧͧ͡Ѻҹ ҳ

Ѻͧ ´ͧšҧ ѧٻ

 

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