looking for VCO with the range of 800-1000MHZ or more

[imgemini]

any one plz help

 

[mechie]

DDS instead of RF VCO

Take a look at ...
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Although the DDS chip here only goes upto about 40Meg it should be posiible to use harmonics to reach the 1Gig you require ?

A microcontroller could perform the A_D required for a true VCO function.
At least it's something to think about ???

 

[mechie]

VCO over my head !

If you are still looking ...
https://www.minicircuits.com/oscillat.html

They list VCOs that can reach 2600 MHz (surface mount jobbies)