Talk:Voltage-controlled oscillator
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What is being talked about in the para I deleted is not a VCO as such but a VCXO ( voltage controlled crystal oscillator.) Because ther will be a great deal of material to put on the VCO article on pure VCOs (when I get round to it),I am of the opinion that VCXOs should have a separate page.
Please reconsider your reversion of my edit.212.74.96.201 04:12, 1 August 2005 (UTC)
[edit] Schematic Accuracy
I would like to recommend that the schematic presented here be reviewed or explained by the creator. This schematic does not represent a VCO; in fact, I'm not even convinced that the circuit portrayed herein will even oscillate. My recommendation is that this schematic be deleted or replaced with something that can be proven to work. Further, there is no mention as to what the source of the schematic is. If anyone is interested, I'll gladly explain what the shortage is in the design.--Cam Finnigan (talk) 03:06, 27 November 2007 (UTC)
- Please explain. It kind-of looks like Colpitts schematics I have in various references. --Wtshymanski (talk) 01:07, 28 November 2007 (UTC)
- It looks like a silly circuit where the choke L4 (with illegible text) short-circuits the varicap control voltage. Cuddlyable3 23:43, 1 December 2007 (UTC)
- Yep. Take it out till we can find a good schematic. --Wtshymanski 17:55, 2 December 2007 (UTC)
- It looks like a silly circuit where the choke L4 (with illegible text) short-circuits the varicap control voltage. Cuddlyable3 23:43, 1 December 2007 (UTC)
- The biggest problem with this portrayal is the fact that the tuning voltage is shorted directly to ground, as already pointed out. Breaking the connection between D2 and C2 would solve that, and then it should both be an oscillator and a VCO. As for other more conventional designs, I could point out several really good references, one of which is http://www.cel.com/pdf/appnotes/an1034.pdf. This is very similar to VCOs that I implement, but at higher frequencies than the one that was shown on Wikipedia. Another excellent reference is at http://www.ansoft.com/empower/Advanced_VCO_Design_using_Ansoft_Designer.pdf. There is also a good article on Skyworks, but I cannot locate it presently. All of these are in the range of 1 to 2 GHz and make use of bipolars. We still don't know the source of the original image, so it may not be fair to simply hack that up. I could make an image, but not in the next short while. Cam Finnigan (talk) 15:37, 15 December 2007 (UTC)
- I should mention that I located a link from the Phase Locked Loop article to a page on U of Guelph that shows a VCO very similar to the one previously presented here. However, it too is broken. In fact, it has no DC return path for the oscillator. Can anyone tell me if there are any standards for schematics on Wikipedia? Cam Finnigan (talk) 04:25, 29 December 2007 (UTC)
