If you can find a copy of PUFF, you should be able to
design the PCB using lumped elements - this would help
your design. You should use only Duroid or similar
board material for the PCB - plain phenolic won't cut
it!!!

Lee

--- Steve Kosmerchock <steve_piclist@YAHOO.COM> wrote:
> PWB means "Printed Wiring Board" (wire wrapped). I
> think you are going to have some serious problems
> doing a 1GHz system on a PWB. The amount of spurs
> and misc noise generated on the PWB will destroy the
> spectral purity of your system. You need impedance
> matching circuits and filtering, a PWB will make
> this extremely difficult.
>
> Best regards,
> Steve
>
> Shahid Sheikh <Shahid.Sheikh@ZEESHANELECTRONICS.COM>
> wrote:
> PWB? You mean a PCB? Yes, its very doable on a PCB.
> Needs some careful
> design and good artwork on the PCB. Achieving very
> high spectral purity
> and high accuracy over a wide temperature range
> (temperature mostly
> effects your reference input only though) can be
> difficult but for most
> applications (e.g. Bluetooth) very simple designs
> can be made to work on
> FR4 with good results. Though long gone are the days
> when you had to
> design every part of the PLL discretely. There are
> many PLL ICs now
> available that will do pretty much everything for
> you.
>
> There is a lot of information available on the web
> on PLLs and
> application notes on manufacturer websites. National
> semiconductors has
> Webench online design environment that may be
> helpful as well
> (http://www.national.com/appinfo/wireless). National
> has some PLL+VCO in
> one chip like the LMX2512
> (http://www.national.com/pf/LM/LMX2512.html)
> but that kinda takes the fun out of designing a PLL
> yourself. Plus I
> don't know if you'll find one for the exact
> frequency you are looking
> for. Maybe you can make that exact frequency by
> designing a compensated
> oscillator as the reference and shift the reference
> input to the PLL
> just a tad bit to get the output frequency you need.
>
> Also if you are completely new to PLL design and RF
> work, an eval board
> for one of these PLL chips may give you a jump
> start.
>
> Shahid
>
> -----Original Message-----
> From: Damien Cahill
> [mailto:damiencahill@AUSTARNET.COM.AU]
> Posted At: Wednesday, February 25, 2004 10:21 AM
> Subject: [EE]: 1GHz fixed output PLL
>
>
> Greetings List,
>
> I am currently designing a 1GHz fixed frequency
> output phase locked
> loop. I am mid way through the design and was just
> speaking with a
> colleague on the feasibility of such an application.
> He seemed to think
> that this would an extreme undertaking and would be
> almost impossible to
> implement with discrete surface mount components on
> a PWB. I'm new to
> the field and this has me worried. Can anyone
> reassure me or does the
> collective brilliance of the PIClist side with the
> daunting opinion of
> my friend. Thanks in advance.
>
> Regards,
> Damien Cahill
>
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