some information

RFIC_Design

不过只看书永远只有感性的认识,一定要自己亲自去设计,哪怕只是重复journal paper上别人的设计,有些回给出具体的size.最好旁边有经验的人指点
It is impossible to give you the answer in short sentenses. Basicly you need to read some papers related these issues. There are lot of design trade-off in LNA,mixer and VCO such as noise figure, dynamic range and power consumption varying with different process. That's why industry have to hire people on RFIC, they can not transfer the design from one process to another process directly.
it is confidential, you have to sign a contract before you get access to it.

.s2p file is two port s-parameter data from low frequency to high frequency, including s11,s12, s21 and s22, which may be generated by network analyzer or any EM simulator like SONNET and Momentum. You can find the explaination for the 2-port s-parameter in any microwave textbook. Given a two port device which you don't know the real circuit model, you use network analyzer to measure 2-port s-parameter, and then you can use the result in HP ads to do both frequency response and transient analysis simulation in your circuits.
SpectreRF是ｃａｄｅｎｃｅ的，可以画图，另外可以与ｃａｎｄｅｎｃｅ后端工具进行集成。
It is commonly use Cadence Spectra RF for RF design. And also Cadence IC 5.0.
我的经验是先用ADS做仿真,ADS功能强大,使用方便,众多template拿来就用,还要小声说一句,我设计PA的时候ADS给出的结果比cadence reasonable. cadence就用来做layout吧,还是很方便的的.最早的时候用magic,免费软件, aweful!
我觉得先用ADS是不错的选择，designguide里面有很多例子可供参考，包括器件的工作点、I-V特性，电路的相关特性等，可以帮助理解。真正设计是离不开cadence，不论原理图还是layout。
ADS与candence结盟后，现在新版cadence中带有RFDE，就是ads中的设计平台，嵌入到了cadence中，因此rf和microwave方面的仿真能力增强了。