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From: The Technical Manager
Subject: Re: RF amplifier
Date: Wed, 06 Nov 2002 16:52:10 +0000
Organization: Microwave Department
References: <4ccv9.1868$Mq.firstname.lastname@example.org> <3DC91134.6CE4F444@niobiumfive.co.uk>
NNTP-Posting-Date: 6 Nov 2002 16:52:10 GMT
X-Mailer: Mozilla 4.78 [en] (X11; U; SunOS 5.7 sun4u)
The Technical Manager wrote:
> carltons wrote:
> > In article , "Richard Webb"
> > wrote:
> > > The book Microwave Engineering by D M Pozar may help - I remember
> > > www.educatorscorner.com being pretty good (its by Agilent).
> Excellent microwave book but the section on amplifiers is a tad on the dated
> side and assumes manual design rather than CAD.
> > Ask around your
> > > college what CAD tools are available to you on your computer network. These
> > > tools will make like a lot easier, but only if you understand the theory
> > > behind RF. Good luck.
> You are best off using a CAD package like HP ADS.
> > >
> > > "David Thomas" wrote in message
> > > news:4ccv9.1868$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.
At 1-2 GHz you might be able to get away without using a network analyzer if the
amplifier isn't going to be characterised using S parameters. Plenty of RF signal
sources and spectrum analyzers operate at 2 GHz
> 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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