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模拟电子技术基础 PowerPoint PPT Presentation


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模拟电子技术基础. 课件制作:. . 郑恒秋. §7.2 基本运算电路. 一、比例运算电路 √ 二、加减运算电路 √ 三、积分和微分运算电路 √ 四、对数和指数运算电路 五、用对数和指数运算电路实现的 乘除运运算电路. 四、对数和指数运算电路. 利用 PN 结伏安特性的指数规律,将二极管或三极管分别接入集成运放的反馈回路和输入回路,可以实现对数运算和指数运算。 1 、对数运算电路 ⑴采用二极管的对数运算电路. 存在的问题: ①运算关系与 U T 和 I S 有关,运算精度受温 度的影响;

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模拟电子技术基础

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7.2


  • PN

  • 1


  • UTIS



  • UTIS


  • ISICL8048


  • N1


  • ISUTR5UT

  • R5 R51+R2/R5)UT

  • R2UT


  • 2

  • uI



  • ISUTR3UT




7.3

  • 1968B.

  • MotoralaMC1595



uO=kuXuY


  • ri1ri2

  • rO

  • k

  • uXuYuO


  • uXuY



  • 1



  • 2

  • uXuY


  • uY

  • uOUT


  • 3


uX<<2UTuY<<2UT

uXuY<



  • 4


  • 1


  • 34


  • k1=10, k2=0.1V-1, N>1

  • N=2N=1010


  • 2

i1=i2


  • ui1>0VuO<0Vui1<0VuO>0V uOuO

  • uO=kuOuI2k uI2<0V k uI2>0V


  • 3

i1=i2


  • uOuIk


  • uI


  • 3


k1=10, k2=0.1V-1, k=1N<1

N=0.5N=0.1


  • 1uO=-0.1V-1uXuYuI3


  • uO uI1uOuI1uOuOk<1uI3 P:


  • P382 7.17

  • P383 7.21

  • P384 7.22



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