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请问DAC输出功率怎么计算，输出电流为2~20mA，输出功率为多少dbm？
以高速DAC34H84为例，输出是电流是交流20mA。输出的匹配阻抗为差分50Ω。对应的交流电压摆幅就是20mA*50Ω=1Vpp.
其Full scale均值功率=10*lg[1000*(1^2)/(8*50)]=+4dBm.
