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Wideband Synthesizer + VCO - RF Cafe Forums

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gui076
Post subject: Wideband Synthesizer + VCO Posted: Mon May 05, 2008 10:01 am

Captain

Joined: Mon May 05, 2008 9:56 am
Posts: 15
Location: France
Hello all,

I would like to design a synthesizer which will work from 900 MHz to 2100 MHz. I have seen on the net that VCOs are not very wideband. So my question is how design a synthesizer for a wide frequency purpose ? using several VCOs ? Multipliers ?

Thanks for your help.

Guillaume


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mac
Post subject: Posted: Tue May 06, 2008 6:58 am

Captain


Joined: Fri Nov 02, 2007 3:45 am
Posts: 8
Location: germany
Hi,
look for Synergy VCOs they have some
wideband vcos in stock
DCMO90220-12 might be o.k

or use two overlapping ones - you can
build a synthesizer with the analog devices pll
chips like ADF4107 etc up to 6ghz and that vcos pretty easy-

hope that helps

regards
mac

_________________
regards
mac


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gui076
Post subject: Posted: Tue May 06, 2008 7:55 am

Captain

Joined: Mon May 05, 2008 9:56 am
Posts: 15
Location: France
Hi,

I have the synthesizer from Analog Device but the voltage command Vp will supply only until 5V if i have well understood. The Synergy VCO has to be tune to 24V in order to deliver 2200 MHz.

I'm not an expert in synthesizers

Guillaume


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mac
Post subject: wideband synthesizer, active loop filterPosted: Wed May 07, 2008 7:58 am

Captain


Joined: Fri Nov 02, 2007 3:45 am
Posts: 8
Location: germany
Well,
you can use an active loop filter instead of
a passive one with an opamp boosting your
tuning voltage up to 24Volts - analog devices has got a pll design tool
called adisim you can downlod for free - this will help in
designing the loop filter anyway
and you can choose your
filter topology -
use an op with low noise characteristics

in the end, it depends on your specifications - if phase noise and / or
tuning speed are not your primary goals you can use single chip plls
from other vendors aswell
but remember
synthesizer design is always a compromise between
tuning width/ speed / phase noise etc. the more your specification demands the more complex things will get very soon -

good luck

mac

_________________
regards
mac


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gui076
Post subject: Posted: Mon May 12, 2008 11:09 am

Captain

Joined: Mon May 05, 2008 9:56 am
Posts: 15
Location: France
Hi mac,

Ok for the Op Amp, i have more informations about it and my circuit will be defined for a 12V maximum voltage, so i will try to find some VCOs in this range of voltage.

Regards

Guillaume





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