如图中用电池给power1提供5V电源输出正负5v电压,测量APD的1端口出现噪声。摘掉power电源，用电池给芯片只供一个正5V电源，在APD的一端口和放大器输出的A端口均有2.2V的电压，请问问题出在哪。下面绿色的是PCB的图
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