Tuning range calculation of VCO in percentage?

[s.b.biradar]

Hi,

Can somebody explain how to calculate tuning range of VCO in percentage....

Thanks...

 

[erikl]

Re: Tuning range calculation of VCO

See this C@dence VCO workshop: View attachment VCO_workshop_instruction.pdf.

 

[s.b.biradar]

Re: Tuning range calculation of VCO

Thanks a lot..
But if a VCO is tuned from 2.25GHz to 2.63 with oscillation freq of 2.37GHz...
Variation in capacitance of MOS varactor from 0.32 to 0.97 then what will be the percentage tuning range........

 

[erikl]

Re: Tuning range calculation of VCO

... if a VCO is tuned from 2.25GHz to 2.63 with oscillation freq of 2.37GHz ... then what will be the percentage tuning range........

+11% / -5%

 

[s.b.biradar]

Re: Tuning range calculation of VCO

thanks....
but how you have calculated any formula.........

 

[erikl]

Re: Tuning range calculation of VCO

.... how you have calculated any formula.........

(upper-typical)/typical = (2.63 - 2.37)/2.37 =  0.1097 ≈ +11%
(lower-typical)/typical = (2.25 - 2.37)/2.37 = -0.0506 ≈ - 5%

 

[s.b.biradar]

Re: Tuning range calculation of VCO

thank you..

 

[venkateshjuturu]

Re: Tuning range calculation of VCO

Thanks a lot..
But if a VCO is tuned from 2.25GHz to 2.63 with oscillation freq of 2.37GHz...
Variation in capacitance of MOS varactor from 0.32 to 0.97 then what will be the percentage tuning range........

hai,
may i know how u got tuning from 2.25Ghz to 2.63
and variation in capacitance
i mean how to cal capacitance vs voltage using Tanner spice

thanks in advance