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: one element matching Posted: Wed Aug 16, 2006 6:13 pm
Joined: Fri Apr 21, 2006 10:34 pm
hi...if i have a parallel RC load (i.e. a BJT input impedance)
where R is almost 50 Ohms is it possible to use just a series inductor to match to a 50 Ohm source? i can see how
just using a shunt inductor this can be accomplised but i'm not sure if using a series inductor will do the match.
if it can be done, can someone briefly explain how? thanks
Post subject: Posted:
Wed Aug 16, 2006 11:09 pm
Joined: Tue Apr 18, 2006 10:40 pm
yes, you can do
it. but it seems like you're mixing up the definitions; if you know or found out that your IMPEDANCE is something
like 50-jXc, then that means that is 50 in series with Xc and so when you do your analysis by hand or CAD you need
to have a series RC model and not parallel RC model.... of course, if you need to think in parallel you can always
convert to admittance. on the other hand, if your admittance was 50-jXc then you're on the right track but this
value would be odd for a transistor because that means that your transistor size is giving, in simple form, an rpi
value of 1/50, which as far as I can know can't be possible.