Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: LNA topologies? Posted: Tue Aug 02, 2005 1:51 am
Tue Aug 02, 2005 1:44 am
Hi, there are various ways to design LNA, for a low
voltage low power requirement, which topology is better? Can any one give me some useful information on that
particular topology? Thanks very much
Post subject: Posted: Tue Aug 02, 2005 7:57
Joined: Mon Jun 27, 2005 2:02 pm
There are several parameters in LNA design, which have trade-offs between each other. For example:
High linearity vs. low current consumption, high gain vs stability etc. When you design your LNA, you are working
according to given specs. and this dictates the device you will choose. Per a given device, you start to design
the surrounding circuit that will determine the parameters you need. In the design process there are trade-offs
between gain and NF and stability by means of circles on the Smith Chart. You will have to do a compromise between
all these parameters, this compromise will determine your matching/bias circuit components values.