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For help, Modeling Varactor

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angelina

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I am using Cadence to simulate a LO circuit which include a off-chip varactor from Philip, but I don't know how to creat a model of this varactor in Candence. I only know the formula to calculate the capacitor of this varactor. Thanks for any heip!
C=Cj0÷(1+V/VΦ), Cj0=23.129pF, VΦ=2.4894V
 

c_varactor n1 n2 'cj0/(1.0+v(n1,2)/vphi)'
.param cj0=23.123n vphi=2.4894

btw, this equation for varactor is not accurate.
 

i don't know how to build a model for this off-chip varactor in Cadence according to its formula.
 

angelina said:
i don't know how to build a model for this off-chip varactor in Cadence according to its formula.
Click to expand...

add the above two lines to your netlist
 

flushrat said:
angelina said:
i don't know how to build a model for this off-chip varactor in Cadence according to its formula.
Click to expand...

add the above two lines to your netlist
Click to expand...

Could you explain to me how to add to netlist step by step ?
 

angelina said:
Could you explain to me how to add to netlist step by step ?
Click to expand...

1 In ADE, generate netlist for you testbench circuit
2 Edit your netlist, and add the following:
c_varactor n1 n2 'cj0/(1.0+v(n1,n2)/vphi)'
.param cj0=23.123n vphi=2.4894
n1 n2 are the two terminal nodes of your caractor
replace the equation with a more accuracy one if you have.
3 then run simulation
 
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