> From:         Steve Kosmerchock[SMTP:steve_piclist@YAHOO.COM]
> Sent:         Thursday, February 26, 2004 11:18 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: 1GHz fixed output PLL

> Bob, Ken,

> I guess I was wrong. I have always been exposed to the term PCB  or PCA
(Printed Circuit Assembly). I worked with an old > engineer a few years
back that used PWB to refer to wire wrapped boards, see you do learn
something new everyday!!
>
> Steve


> Bob Ammerman <rammerman@VERIZON.NET> 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

I have also seen EWB for Etched Wiring Boards. Strictly speaking, printed
boards
are constructed by silk screening conductive paint onto an insulating
substrate.
This is how the first "printed" boards were made during WWII for the
proximity
fuse. Resolution is poor, but they are cheap and don't involve toxic waste
disposal. Especially good if a cheap board is needed for one time use.

On the topic of building 1GHz circuits on a PCB/PWB/EWB/PCA, look at
the article in Circuit Cellar #149, Dec 2002, on page 24: "Vector-SoC". It
describes a winning entry in on of the magazines design contests.
The device is a 1GHz Vector Network Analyzer, built around the
Analog Devices AD8302.

      John Power

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