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Design >> RF Design >> high frequency lna design(just a beginner)
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Message started by ravigupta on Jun 16^th, 2003, 11:06am

Title: high frequency lna design(just a beginner)
Post by ravigupta on Jun 16^th, 2003, 11:06am

hello everyone .
I'm a graduate student at Univ. of Texas at Austin.
I'm a novice to rf design ,and am currently working on the lna design.
I'm yet to get the spectre rf installed,
Can anyone tell where can I get the correct mos models ..
yaa theres mosis ..where i can use ami .5um ...,would that be fine?
and ..there is no channel length modulation parameter(lambda) specified in those models ..,so how can one derive that from the given parameters ..?

Title: Re: high frequency lna design(just a beginner)
Post by fhidalgo on Jun 30^th, 2003, 7:33am

The design of an LNA is bounded by specifications that need to be implemented. As such, an LNA for a GSM
radio might be different from that needed for an UWB
radio. The IC technology chosen will depend heavily on
the circumstances being considered.

Apparently you are working on a high-frequency LNA
implementation. High frequency describes a wide range
of applications. Furthermore, while you might consider,
for example, 1.8GHz high frequency, other might consider high frequency 10 GHz or more. In either case
the technology chosen, the LNA topolgy chosen, the specifications dictating the design and more will be different.

There are some common elements that govern the desing of LNAs such as low NF, good IP3, BW, etc. Your
application should determine how low a NF you want to
achieve, what your IP3 should be, and how broadband
your design must be.

I believe a 0.5u CMOS technology is not appropriate for
the design of a "high-frequency" LNA design, unless the
requirements are quite relaxed. MOSIS is a good source
for IC technologies and related models. TSMC also
offers IC technology and models: 0.18u CMOS for example.

Good luck.

Fernando