Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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please reply---output match in PA - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: please reply---output match in PA Posted: Sun
Jan 08, 2006 2:22 am
i know i've been asking a few questions and
i really appreciate all the answer....i'm a student learning and i've
one more question to ask.
i did loadpull analysis and i found
out that I need a load of X+jY. so what i did i just transformed a 50
ohm load to X+jY using the matching utility in ADS and it seemed to
work. now when i put it in the circuit it doesn't match all that well.
when i am running s-param simulation i terminate in 50 ohms since i'm
transforming 50 ohms to X+jY, right? if not please explain how a match
can be verified for optimal load match? Just wanted to make sure. the
thing that is confusing me is that the output is taken from the collector
and there is a certain output impedance....if you were doing the usual
conjugate match then it is clear to me but here it's not conjugate match
but instead the transistor needs to see a certain load (X+jY) and i
do that by transforming 50 ohms to this X+jY value...because of this
i don't understand what the output reflection coefficient is calculating
or reprsenting?? the thing is if i try to tune the components of output
match in ADS then this would eventually lead to "conjugate match" and
not a match to X+jY because as I said the output is connected to collector
and after a matching network is terminated in 50 Ohms.
way i did output match was to take the X+jY impedance and then do the
usual standard method of matching 50 ohms to X+jY...this is how you
do it, right? please reply, your help will be very much required