问关于Razavi的射频微电子书中的问题！
12-10
书中有一段半天理解不了：
Now soppose the receiver of Fig 5.12 exhibits a total gain of 40db form A to G.If the two IF filters provided no channel selection ,the IP3 of the IF amplifier would need to be more than 40dB higher than that of the LNA,e.g.,in the vicinity of +30 dBm.
IF filter provided no channel selection 是什么意思？Why the IP3 of the IF amplifier would need to be more than 40dB higher than that of the LNA ，if
that。
Thank you！
Now soppose the receiver of Fig 5.12 exhibits a total gain of 40db form A to G.If the two IF filters provided no channel selection ,the IP3 of the IF amplifier would need to be more than 40dB higher than that of the LNA,e.g.,in the vicinity of +30 dBm.
IF filter provided no channel selection 是什么意思？Why the IP3 of the IF amplifier would need to be more than 40dB higher than that of the LNA ，if
that。
Thank you！
因为信号被放大了40dB
同时中频滤波器并不能对临信道或次临信道的强干扰进行抑制。
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