Anatech Electronics (RF Filters) - RF Cafe
LadyBug Technologies LB5944A RF Power Sensor - RF Cafe
 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
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 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...

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

Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes App Notes Calculators Education Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Homepage Thank you for visiting RF Cafe!
Exodus Advanced Communications Best in Class RF Amplifier SSPAs

Breakdown voltages affects in BJT/HBT - 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.

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

-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews
-- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

guest
Post subject: Breakdown voltages affects in BJT/HBT Posted: Wed Feb 08, 2006 8:20 pm
Hello people:

I am a student and I need to clarify a point. This questino relates to integrated cirucit transistor and not discrete transistors.

I am using HBT (basically BJT structure) and I was doing DC sweep. When I had just one HBT device and I ran the sweep from IBB=10u to 80uA with VCE=0 to 2.5 it works fine.

But when I have two same devices in parallel and I did DC sweep for the same ranges I get the warning that the base-emitter and base-collector are in reverse bias breakdown.

This seems counter intiutative (may be just because of my lack of knowledge). I thought that now that I have two devices in parallel, the overall transistor should be able to handle more current or at least the same amount of current as the single device and should have the same voltage limiations as the single device because the two devices are in parallel. Why do you think the device is breakdown? Doesn't parallel mean that the collector and base of the two devices are connected together? Thank you.

Marc



Posted  11/12/2012
Copper Mountain Technologies - RF Cafe
withwave microwave devices - RF Cafe
LOTUS Communications Systems Modular RF Component Building Blocks - RF Cafe
 

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free