Need information regarding varactor

[Abhishekabs]

Hi friends
Can any one tell me which varactor diode is useful for frequency 6 GHz & 10GHz
I want to design VCO.
Can any one provide names of company & model no. of such varactor.
Thanks
Abhishekabs

 

[Sadegh.j]

Hey,

To answer your question, I would like to quote from "A Multi-Rate 9.953–12.5-GHz 0.2-m SiGe BiCMOS LC Oscillator Using a Resistor-Tuned Varactor and a Supply Pushing Cancellation Circuit" from A. Maxim published in JSSC:
"Covering a wide 9.953–12.5-GHz frequency range, while ensuring an additional 10% to 15% range to accommodate the process, temperature, and supply variation of the LC oscillator frequency, leads to an oscillator with an ultra-wide tuning range, in which most of the tank capacitance needs to be implemented as varactors [11]–[18]. The lower quality factor of the varactors in comparison with the fixed capacitors leads to a degraded VCO phase noise performance. Furthermore, a large frequency range and a low available control voltage range (limited by the supply voltage and device breakdown voltages) results in a large oscillator gain, which increases both intrinsic device noise and coupled spurious tones up-conversion around the carrier [23],[24]."

And then the paper mentions a different method to implement the varactor. (Well, not a totally new one though). I think the paper is a very nice one to read 10 times. Never gets boring. I learned a lot from it.

It is available on the board.

Cheers

 

[Abhishekabs]

Please post link of paper here.
I am designning VCO on microstrip circuit, there you need to connect varactor diode,RFC etc. for biasing.
I want the information of that Varactor.
I am not using any IC.
Thanks for information
ABhishekabs

 

[radiohead]

You can find them from Skyworks
**broken link removed**

Other can be found through google.[/url]

 

[Soben]

Ma-Acom (now is owned by Tyco electronics) has Varicaps for you.

MA46Series will do fine for you but there are others as well for you to chose.

Here is the link of the diode selection



http://catalog.tycoelectronics.com/TE/bin/TE.Connect?C=18278&M=FEAT&BML=10576,12713&LG=1&I=13