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文章阅读:Re: RF transceiver已经没有前途了
[版面: 电子工程] [作者:bard] , 2002年05月10日12:37:43
bard
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发信人: bard (HBT), 信区: EE
标  题: Re: RF transceiver已经没有前途了
发信站: The unknown SPACE (Fri May 10 12:37:43 2002) WWW-POST

Why do you only mention CMOS?
Actually it may not be the right direction.
Although after many year's study, the performance of CMOS RF has improved
significantly. And some lab or company have claimed that their CMOS RF has
exhibit comparable performance as those of GaAs. But it has been found out
that their CMOS RF is not cheap at all, which has deviated from  its original
motivations. In order to achieve such performane, their CMOS circuit is quite
complicated, which usually requires much more masks and processing steps.
There were quite a lot arguments about this subject in the IEDM last year.
Novel Si-based devices for RF are good but not cheap at all. The cost of
substrate now is only small portion of the whole cost of RFIC.of course, for
processor or memory, the situation is different.  
When we look at high-end products, at least at present, CMOS RF can not touch
this field at all. They are all GaAs, InP stuffs.

【 在 avante (avante) 的大作中提到: 】
: 应用的系统无非是GSM(CDMA),
: 现在热的是5GHz wireless LAN
: GSM对transceiver来说无疑是最难的
: 因为channel bandwidth is only 200KHz
: 对VCO/frequency synthesizer的phase noise
: 要求很高,对mixer IP3的要求也类似
: 而COMS再厉害还是利害不过SiGe or BiCMOS
: 公司里有很多牛人,不比T.LEE等水平低
: 只是人家没来发表文章而已
:
: 再看Wireless LAN
: 虽然频率高了
: 但是一是channel 少了
: channle bandwidth 宽了
: 二是Q of L is higher at higher frequency,
: so 很多指标比GSM反而更容易达到
:
: 近10年来在GSM上发了那么多论文
: 已经属于过热,尤其是CMOS
: 就算可能CMOS在GPS,or pager,甚至wireless lan可能有作为
: 但是作为研究的价值几乎已经没有了
: 现在该是寻找新课题的时候了
:
: 当然bluetooth 2.4G a paper published
: in ISSCC2002 by David Su, but still
: a quesion: ten years of RF CMOS, but
: how many products?
:
: 欢迎讨论
:


--
※ 来源:.The unknown SPACE bbs.mit.edu.[FROM: 128.84.163.40]

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