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| Wideband Synthesizer + VCO - RF Cafe Forums | ||||||
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Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
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Below are all of the forum threads, including all the responses to the original posts. 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 | ||||||
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