做的是光电二极管的放大和滤波电路。用lm2663将5V转为-5V，已单独接地，但还有几十mV的15kHz及高频谐波干扰信号，如何去除呢？运放电源端接的是10uF钽电容和0.1uF陶瓷电容，另，运放和LM2663需在同一块板上。。。
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