电路分析

深碍√TFBOYSˉ_ 2023-06-16 10:43 59阅读 0赞

设定几个标准：

*  ADC 的参考电压为0.1V即100mV
 *  ADC值的范围为（12bit）：0~4095

## 电流水平一（测量电阻1KΩ）：(1uA~10uA) ##

1uA对应的ADC值为：40  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWVmeXVhbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70]

<table> 
 <thead> 
  <tr> 
   <th>输入电流<br>Ic</th> 
   <th>测量电阻电压<br>Vc=Ic*R4</th> 
   <th>放大器增益<br>Gain=（R2+R3）/R1</th> 
   <th>输出电压<br>Vo=Vc*Gain</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>1uA</td> 
   <td>1mV</td> 
   <td>10</td> 
   <td>10mV</td> 
  </tr> 
  <tr> 
   <td>5uA</td> 
   <td>5mV</td> 
   <td>10</td> 
   <td>50mV</td> 
  </tr> 
  <tr> 
   <td>10uA</td> 
   <td>10mV</td> 
   <td>10</td> 
   <td>100mV</td> 
  </tr> 
 </tbody> 
</table>

## 电流水平二（测量电阻120Ω）：（10uA~100uA） ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWVmeXVhbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 1]

<table> 
 <thead> 
  <tr> 
   <th>输入电流<br>Ic</th> 
   <th>测量电阻电压<br>Vc=Ic*R4</th> 
   <th>放大器增益<br>Gain=（R2+R3）/R1</th> 
   <th>输出电压<br>Vo=Vc*Gain</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>10uA</td> 
   <td>1.2mV</td> 
   <td>10</td> 
   <td>12mV</td> 
  </tr> 
  <tr> 
   <td>50uA</td> 
   <td>6mV</td> 
   <td>10</td> 
   <td>60mV</td> 
  </tr> 
  <tr> 
   <td>100uA</td> 
   <td>12mV</td> 
   <td>10</td> 
   <td>120mV</td> 
  </tr> 
 </tbody> 
</table>

## 电流水平三（测量电阻15Ω）：（100uA~1000uA） ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWVmeXVhbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 2]

<table> 
 <thead> 
  <tr> 
   <th>输入电流<br>Ic</th> 
   <th>测量电阻电压<br>Vc=Ic*R4</th> 
   <th>放大器增益<br>Gain=（R2+R3）/R1</th> 
   <th>输出电压<br>Vo=Vc*Gain</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>100uA</td> 
   <td>1.5mV</td> 
   <td>10</td> 
   <td>15mV</td> 
  </tr> 
  <tr> 
   <td>500uA</td> 
   <td>7.5mV</td> 
   <td>10</td> 
   <td>75mV</td> 
  </tr> 
  <tr> 
   <td>1000uA</td> 
   <td>15mV</td> 
   <td>10</td> 
   <td>150mV</td> 
  </tr> 
 </tbody> 
</table>

## 电流水平四（测量电阻2Ω）：（1mA~10mA） ##

<table> 
 <thead> 
  <tr> 
   <th>输入电流<br>Ic</th> 
   <th>测量电阻电压<br>Vc=Ic*R4</th> 
   <th>放大器增益<br>Gain=（R2+R3）/R1</th> 
   <th>输出电压<br>Vo=Vc*Gain</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>1mA</td> 
   <td>1.5mV</td> 
   <td>10</td> 
   <td>20mV</td> 
  </tr> 
  <tr> 
   <td>5mA</td> 
   <td>7.5mV</td> 
   <td>10</td> 
   <td>100mV</td> 
  </tr> 
  <tr> 
   <td>10mA</td> 
   <td>15mV</td> 
   <td>10</td> 
   <td>200mV</td> 
  </tr> 
 </tbody> 
</table>

## 电流水平五（测量电阻0.25Ω）：（10mA~100mA） ##

<table> 
 <thead> 
  <tr> 
   <th>输入电流<br>Ic</th> 
   <th>测量电阻电压<br>Vc=Ic*R4</th> 
   <th>放大器增益<br>Gain=（R2+R3）/R1</th> 
   <th>输出电压<br>Vo=Vc*Gain</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>10mA</td> 
   <td>1.5mV</td> 
   <td>10</td> 
   <td>15mV</td> 
  </tr> 
  <tr> 
   <td>50mA</td> 
   <td>7.5mV</td> 
   <td>10</td> 
   <td>75mV</td> 
  </tr> 
  <tr> 
   <td>100mA</td> 
   <td>15mV</td> 
   <td>10</td> 
   <td>150mV</td> 
  </tr> 
 </tbody> 
</table>

## 电流水平六（测量电阻0.03Ω）：（100mA~1A） ##

<table> 
 <thead> 
  <tr> 
   <th>输入电流<br>Ic</th> 
   <th>测量电阻电压<br>Vc=Ic*R4</th> 
   <th>放大器增益<br>Gain=（R2+R3）/R1</th> 
   <th>输出电压<br>Vo=Vc*Gain</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>100mA</td> 
   <td>1.5mV</td> 
   <td>10</td> 
   <td>15mV</td> 
  </tr> 
  <tr> 
   <td>500mA</td> 
   <td>7.5mV</td> 
   <td>10</td> 
   <td>75mV</td> 
  </tr> 
  <tr> 
   <td>1A</td> 
   <td>15mV</td> 
   <td>10</td> 
   <td>150mV</td> 
  </tr> 
 </tbody> 
</table>

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