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: RF CIRCUIT DESIGN BY ADS
Posted: Sat Feb 13, 2010 12:47 am
Joined: Sat Feb 13, 2010 12:16 am
Excuse me, I'm studding MSC,I looking for procedure design The RF amplifier work in 34GHz, i know i should make matching for cct. in s-parameter but idont know how i do bias cct without effect the matching cct.
Post subject: Re: RF CIRCUIT DESIGN BY ADS
Posted: Sun Feb 14, 2010 8:25 pm
Joined: Wed Feb 22, 2006 3:51 pm
At 34 GHz, there may be unavoidable interaction between the impedance matching circuit and the bias circuit - especially if you're trying to get a broad-band amplifier.
That said, a quarter-wave line (acting as a transformer) from the bias source to the active device may help - but pretty much all passive devices will be composites. By which I mean, there will be unavoidable capacitance to your resistors, unavoidable resistance all over the place in your transmission lines and resonators. Your best bet is just to make allowances.