Comments (3)
单片机的ADC输入阻抗比较低,如果外部的分压输入阻抗太高的话会影响ADC的采样结果。你的这个电路,加上DSO后,R8和R9+R10等于是并联到一起,并联后的值是6K,6K和R7串在一起分压刚好是1/3。输入阻抗低的问题可以通过增加运放解决,但一般的运放在转换高频信号时速度跟不上。
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单片机的ADC输入阻抗比较低,如果外部的分压输入阻抗太高的话会影响ADC的采样结果。你的这个电路,加上DSO后,R8和R9+R10等于是并联到一起,并联后的值是6K,6K和R7串在一起分压刚好是1/3。输入阻抗低的问题可以通过增加运放解决,但一般的运放在转换高频信号时速度跟不上。
懂了,我是没考虑到mcu的adc内部阻抗。那就是说按照目前的设计,只能用来测量等效电阻较小(<1k)的电路。否则误差就会比较大了是吧。另外,我觉得你这个挺有意思的,就按照你提供的资料,我自己也画 了个小板。不过还没焊接测试,下面附上3d图。测试没问题的话,会在这里提供项目的链接。
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@CreativeLau 这里分享一下工程的链接-Mini-DSO-PCB
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Related Issues (3)
- 限制这个示波器采样频率的瓶颈在哪里? HOT 4
- 一些计算细节的原理疑问? HOT 1
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