Homepage - RF Cafe
Webmaster: Kirt Blattenberger | KB3UON | Sitemap | ©1996-2014     Visit RF Cafe on
      Menu below is just a small sample of what is here!          Visit RF Cafe on Facebook Visit RF Cafe on Twitter Visit RF Cafe on LinkedIn
Custom Search
More than 10,000 searchable pages indexed.
•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

IMS resistors with partial wraparound - 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.


Peter
Post subject: IMS resistors with partial wraparound
Unread postPosted: Wed Jun 29, 2005 4:12 pm

I am reading about IMS resistors, that are said to be more suited for microwave performances than standard SMT resistors.

Does anybody know if it is stricly a question of wraparound?

For example I saw simulations with manufacturer's model on ADS comparing kemet resistors and IMS. For 0805 package between 1 and 2 GHz there was a significant slope 1dB on the attenuation. For the IMS resitors however this slope was minimal.

I am suprised that just this wraparound question would cause such a difference.

Anybody experienced the same? Any comments?


Top


Guest
Post subject:
Unread postPosted: Tue Jul 05, 2005 1:08 pm

Wraparound certainly is a big part of it. A lot depends on the value of the resistor and the intended use. For large value resistors, the wraparound can add a signficant parallel capacitance term. For low value resistors, the wraparound can add a significant series inductive term. The method of attachment can also be a significant factor.

For example, about 20 years ago I designed a transimpedance amplifier that used a descrete resistor to set the transimpedance gain (for a fiber optic receiver application). I use a non-wraparound resistor (from IMS and others) because the sub-pF capacitance from the wraparound termination would dramatically affect the bandwidth (due to the multiplication from the amp).


Posted  11/12/2012
A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
Your RF Cafe Progenitor & Webmaster
Click here to read about RF CafeKirt Blattenberger... single-handedly redefining what an
                                 engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem! (Seize the Day!)

5CCG (5th MOB): My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website