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TINA-TI: THS4551用信号分析仪分析幅频曲线

Part Number: TINA-TI
Other Parts Discussed in Thread: THS4551

我下载了sboc462,我用信号分析仪分析了ths4551的幅频虚线,图中写的截止频率是500KHz,为什么分析仪得出的结果在500kHz处-8.43dB,不是应在在-3dB处为500kHz吗?实际在-3dB处为288.09kHz,这是什么问题?该如何解决?