全模拟电路实现的电子秤设计电路图（包含AD完整工程）
本次课程要求利用传感器设计制作一款高精度传感器，要求传感器有大小两个量程，量程之间可自动或手动切换，小量程的量程为0-200g，误差范围控制在1%以内；大量程的量程为0-2000g，误差范围控制在1%以内。全过程只采用用模拟量实现测量，不使用单片机等控制芯片设计电路。
本系统主要电路部分均采用模拟电路完成，前端信号采集采用悬臂梁式电阻应变片式压力传感器完成。传感器采集的信号送入信号放大电路，信号放大电路采用仪用放大器 INA128 芯片完成，INA128 需要精准的零电压作为参考电压，因此采用 OP07 芯片输出零值电压给 INA128 作为精准的参考电压。传感器采集的信号经 INA128 放大后，送入信号处理电路完成信号的模数转换及数码管信号译码，本部分采用 ICL7107 芯片完成。ICL7107 芯片完成信号的模数转换后，将译出的数据送入显示电路完成用户终端的显示，本部分采用三位半数码管完成。
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