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From: The Technical Manager
Subject: Re: RF amplifier
Date: Wed, 06 Nov 2002 12:55:16 +0000
Organization: Microwave Department
NNTP-Posting-Date: 6 Nov 2002 12:55:17 GMT
X-Mailer: Mozilla 4.78 [en] (X11; U; SunOS 5.7 sun4u)
> In article , "Richard Webb"
> > The book Microwave Engineering by D M Pozar may help - I remember
> > www.educatorscorner.com being pretty good (its by Agilent).
Excellent microwave book but the section on amplifiers is a tad on the dated
side and assumes manual design rather than CAD.
> Ask around your
> > college what CAD tools are available to you on your computer network. These
> > tools will make like a lot easier, but only if you understand the theory
> > behind RF. Good luck.
You are best off using a CAD package like HP ADS.
> > "David Thomas" wrote in message
> > news:4ccv9.1868$Mq.email@example.com...
> > > I am a final year student in the UK and am about to start my project
> > making
> > > an RF amplifier for between 1-2GHz. I can't seem to find much on the web
> > for
> > > amplifierrs in this range. Does anybody know of any websites that may be
> > > useful to me, or have any example circuit diagrams of something similar?
Most good stuff on microwave amplifiers is in journals like IEEE MTT, Microwave
Journal, Microwaves & RF etc. so do a search on Inspec for articles relating to
Good books include the following:
RF Power Amplifiers for Wireless Communications. Steve Cripps.
High Power GaAs FET Amplifiers. J. L.B. Walker.
Modern Communication Circuits. J. Smith.
> > Any
> > > help would be appreciated.
> > > Dave Thomas
> > >
> > >
Have you chosen your transistor yet ?
> I would also make sure that you have a network analyzer and the other
> equipment available to complete a thorough investigation and analysis of
> your rf amp project. Please make sure that your advisor is looking out
> for your welfare in this regard. RF amps aren't gigantic undertakings,
> but they do require some skill-building and finese.
Linear small signal amps are a doddle but power amps create lots of
complications of their own and are a massive subject in their own right.
> One thing that you
> may find the hard way is that ground is not necessarily ground (or is it
> "earth is not necessarily earth" in English rather than American English
> :-)). Although not simple, this project should prove to be informative
> and even fun. None-the-less, good luck.
> Another thought: If you are making a class A amp, maybe you should
> consider including IMD measurements, etc in the final report.
For a power amp then definitely but for a small signal (linear amp) then
distortion is minimum. You will also need to set the right bias point for
linearity, low noise, maximum gain, maximum power output etc. and do both power
and noise figure measurements.
> Other neat
> things spring to mind, but let's not go overboard.
> Steve WB4CZR
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