采样频率:104M
中频:130M
采样点数:330000
只采底噪,正常,-140dbFS/Hz左右
灌入-20dBm信号,经过巴伦,ADC采样后3次和5次谐波与基频同等幅度,幅度大概为-34dBfs,偶次谐波在-50dBc左右,并且基频两侧每隔10多KHz就有一个杂散,像裙子一样,帮忙分析一下有可能是什么原因,多谢
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-20dbm对应-34dbfs。你的输入是50欧姆阻抗匹配吗?
有没有输入测试信号的频谱图?