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发表于 2009-3-21 02:48:04
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原帖由 bing131 于 2009-2-10 10:41 发表
实际上,那个李辑熙是做pcb分立元件rf的,对RFIC尤其是CMOS的RFIC他根本相当于是外行。他的理论是不错的,功率匹配对于RF来说非常重要,但是他没有搞清楚的是,分立元件的RF电路,阻抗一般都是50欧或者75欧的实数,阻 ...
1. If mixer is the load of LNA, you must account the loading of Mixer together for the opimization of NF/Gain instead of seperately.
2. There is not Cgs alone between Stage and stage in RFIC, don't forget Rg, which is always in the RF model.
3. Even CMOS RFIC, 50 ohm termination are also very common. 功率匹配 is important, but mostly of cases not required at all. |
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