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unloaded differential circuit - RF Cafe Forums

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 Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


boon
Post subject: unloaded differential circuit Posted: Thu Oct 05, 2006 6:46 am

Captain

Joined: Tue Feb 21, 2006 5:19 pm
Posts: 17
hi,

let's say i have differential power amplifier. if i unload one side of it at both the input and output (meaning don't terminate one side with 50 Ohm at intput/output), wouldn't ideally the magnitude of output power remain the same (and hence the gain).

the way i'm thinking is that the phase will be affected. also, i read that having differential (balanced/push-pull) configuration is better because the input/output impedance is increased, the common lead inductance through source/emitter connection is reduced and that 2nd harmonic is canceled. why is it desired to have the inptut/output impedance increased? another thing, does every balanced/push-pull configuration cancels out 2nd harmonic. i'm thinking not. please share your feedback/ideas. thanks



Posted  11/12/2012
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