Custom Search
Over 10000 Pages Indexed
Your Host
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

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

3:1 microwave combiner - 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.


Qorub
Post subject: 3:1 microwave combiner
Unread postPosted: Sun Apr 24, 2005 11:31 am

Hi everyone.
I want to know about 3:1 directional couper (combiner). Can anyone provide me papers, articles or circuits about it?
Thanks for your time and help.
Qorub


Qacer
Post subject: LNA (Low noise amplifier) using an NPN BJT with feeback
Unread postPosted: Sat Apr 23, 2005 2:18 pm
Offline
Captain

Joined: Sat Apr 23, 2005 2:09 pm
Posts: 17
Location: Tampa, FL
Hi all,

This is my first post, so please excuse my newbieness.

I'm reading up on LNA design, and I'm curious about the DC bias feedback setup using a reactive component (e.g. inductor) at the NPN's emitter lead to improve stability.

Can someone direct me to the formal analysis of this with regards to relating it to stability? I'm assuming that it helps maintain the collector current to have a uniform stability across a band of frequencies. I'm just not to sure how to come up with the reactive component value.

I can see the results right away using ADS, but I would like to see some sort of analysis on paper.

Thank you very much!





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