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JFE150: 关于JFE150低噪声放大电路实际噪声测量比理论仿真大的问题

Part Number: JFE150
Other Parts Discussed in Thread: OPA210

图1是JFE150低噪声放大电路的结构,噪声仿真如图2所示,仿真结果显示,电路噪声在100Hz处为273nV@√Hz,1KHz处为261@√Hz,换算单位成dB,也就是-131.3dB@100Hz-131.6dB@1KHz。但是实际电路噪声测试的结果如图3所示,我用的测量噪声仪器是安捷伦35670A。实际测试电路噪声在100Hz处为-122.6dB,在1KHz处为-131dB。不明白为什么100Hz处的噪声偏差这么大?希望有人可以帮助我。