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放大达不到 芯片资料 给出的 40dB变化范围。
最主要是 达不到+20dB。
请检查输入和输出的共模看是否超出指标书的范围(如果偏置太大,会损失动态范围). 另外请检查看增益控制管腿上的纹波有多大. 谢谢!
