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    Kirt Blattenberger,

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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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one element matching - 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.

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krc
Post subject: one element matching Posted: Wed Aug 16, 2006 6:13 pm

Lieutenant

Joined: Fri Apr 21, 2006 10:34 pm
Posts: 3
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


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jabb
Post subject: Posted: Wed Aug 16, 2006 11:09 pm

Captain

Joined: Tue Apr 18, 2006 10:40 pm
Posts: 9
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.



Posted  11/12/2012
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