Thank you for visiting RF Cafe! Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums RF Cafe Homepage Thank you for visiting RF Cafe!

Buffer -- to 50Ohm PCB Constraint - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


Xconnect
Post subject: Buffer -- to 50Ohm PCB constraint Posted: Tue Jan 13, 2009 12:29 am

Lieutenant

Joined: Thu Jan 08, 2009 10:27 pm
Posts: 2
I have a buffer output (1MHz output at max) that needs to connect to a 50Ohm line (that runs the length of the PCB board)to be measured for frequency. There is about 6inches between the connector edge of this buffer output to the point where it meets up(becomes 50 ohms) on the PCB stripline.

At these low frequencies is it still worthwhile to establish the 50 ohm impedance closer to the connector or perhaps just using a low value series R close to the connector will suffice to mitigate reflections to the frequency counter?


Top

nubbage
Post subject: Posted: Thu Jan 15, 2009 6:56 am

General


Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
IMHO at such a low frequency anything goes, but to give peace of mind, you could insert a small T pad giving 6dB attenuation in a 50 ohm circuit, near the buffer output. I have often made these up from carbon film surface mount chip resistors; they give enough isolation against mismatches to avoid problems

_________________
At bottom, life is all about
Sucking in and blowing out.








Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Webmaster:
Kirt Blattenberger,
 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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

height-line