我的电路设计基本如上,想给前端的光电二极管两端加上恒定反向电压V,一直是5V,取I,经跨阻放大器进行放大。
上一版直接让VBIAS=5v,结果Vin处有电压大约为1.8V(差不多是Vref的值),结果光电二极管只有3.2V,怎么能让其恒定为5V。(是不是Vbias=6.8V就能保证了?)
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