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 Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
Innovative Power Products Couplers

Power FET question - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2010 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. 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.

NOTICE: The original RF Cafe Forum is available again for reading, and the new RF Cafe Blog is an active board.

-- Amateur Radio

-- Anecdotes, Gripes, & Humor

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Miscellany

-- Swap Shop

-- Systems

-- Test & Measurement

-- Webmaster

krc

Post subject: Power FET question Posted: Fri Apr 21, 2006 10:42 pm

Lieutenant

Joined: Fri Apr 21, 2006 10:34 pm

Posts: 3

hi...i am student and this is simple question: i have a power fet that need to be biased at 12 A of current for its Id biasing.however the current source outputs 25 A of current. since i don't have resistor that can handle this level of current what can i do so that only 12 A of current goes in the drain of the current? thanx

kc

Top

IR

Post subject: Posted: Mon Apr 24, 2006 4:07 pm

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm

Posts: 373

Location: Germany

Hello,

The current passing through the FET's drain is set by the minimal load that you will connect to your circuit. There are many current limiting circuits relatively easy to implement, and you need to use one in your design. Look in Google there are many applications for such circuits.

Here is just a single example from a quick search in Google:

http://www.radio-electronics.com/info/c ... imiter.php

Good luck!

_________________

Best regards,

- IR

Top

Jeanalmira

Post subject: Posted: Tue Jun 13, 2006 10:21 pm

General

Joined: Tue Mar 15, 2005 11:43 pm

Posts: 65

Location: Singapore

Hi krc :

I agree with IR.

Antoher way to control the drain current, you also may want to limit/set your gate biasing voltage, so that it will give you the desired drain current at respective drain voltage. For doing this, you can try to apply voltage divider in the gate bias line.

I hope it helps.

Cheers,

Jean

Posted  11/12/2012

Innovative Power Products Couplers

RF Cascade Workbook 2018 by RF Cafe
everythingRF RF & Microwave Parts Database - RF Cafe
Axiom Test Equipment - RF Cafe

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

These Are Available for Free

 

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