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: Loadpull in ADS Posted: Sat Dec 31, 2005 12:54 am
Does any one have experience
with the many loadpull templates in ADS. I just want to know what exactly is s11_rho and s11_center and how do you
modify its default setting for your own simulation?? The default is s11_rho = .75 and s11_center = 0.0 + j*0.0.
Also, in the same templates the S1P_Eqn component has the value for its parameter S[1,1]=LoadTuner. What's
this 'LoadTuner'? I mean when you type this in what is ADS reading/doing?? Thanks
Post subject: Posted: Mon Jan 02, 2006 1:47 am
Here is a pic of a Loadpull simulation of simple
PA. Below shows the power contours. I am very new to this I don't have a whole lot of experience so please tell me
if these contours remotely look right? The reason for my suspicion is that in ALL of the references I have seen in
textbooks and other places all of the power contours are, unlike mine, to the left of the smith chart...mine are
to the right and open the like "(" instead of opening the other way like in references ")". The reference system
impedance is 50 as usual. Also, I am expecting the optimal load ipmedance to be actually higher than 50 Ohms since
my output power requirement is very low (10 dBm). This question sounds really dumb but what can i do? that's the
best way for me to ask to clarify my confusion. Anyone knows a reference/tutorial that talks about loadpull/power
contours in simple terms....not too high level. Thanks guys!!
Post subject: Posted: Mon Jan 02, 2006 11:27 am
You are coorect in your assumption about the load pull
being to the left. Power amplifiers are normally comprised of fairly large devices and as result the impedance
looking into the output is relatively low, hence the contors show to the left of the smith chart. Now, some
devices are internally matched, therefore , what you may be looking at is a matched device. Cant say for sure
since I donot what device isbeing plotted. Steve Cripps has written many books on power amplifier design, also,
you may wat to google PA, or Load PUll to find other relative references.