Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
Innovative Power Products Couplers

Wideband Synthesizer + VCO - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2010 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

NOTICE: The original RF Cafe Forum is available again for reading, and the new RF Cafe Blog is an active board.

-- Amateur Radio

-- Anecdotes, Gripes, & Humor

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Miscellany

-- Swap Shop

-- Systems

-- Test & Measurement

-- Webmaster

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

Top

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

Top

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

Top

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

Top

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

Posted  11/12/2012

KR Electronics (RF Filters) - RF Cafe
Windfreak Technologies Frequency Synthesizers - RF Cafe
Axiom Test Equipment - RF Cafe
Innovative Power Products Passive RF Products - RF Cafe
withwave microwave devices - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free

 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com