小弟有几个问题，大家帮忙解答一下吧。

爱钱的鸽子

a.What is the total lose between cellphone’s PA to basestation’s receiver?
b.When take measurement with network analyzer, what does it mean if there is certain point falling out of smith chart?
c.On Smith chart, can I use the same chart for 50ohm system as well as 75ohm?
d.When an amplifier starts to oscillate, what do you call this amplifier?
e.Input power is 10dBm, output power is 20dBm, how much power is added in watts and dBm?
f.Why does LNA use inductive emitter degeneration?

nevergame

干吗用英语呢，看的好累。。。。。标题都是汉语[em07]

水随天去

a,空间衰落,自由空间衰落公式是:32.4+20*logd(km)+20*logf(MHz)。当然，移动通信中由于地形地貌的复杂，会加入一些校正因子，这个看具体的情况
b,落在园外，说明是负阻了，可能会振荡
c,当然可以，你读的时候使用归一化读数，然后再用各自的特性阻抗转换过去
d,这看你想做的是什么了:P
e,注入的功率就是10dBm了,0.01W
f,不懂
水平不高，有错误的地方就见谅了[br]<p align=right><font color=red>+3 RD币</font></p>