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multiple Y-param results for varactor

Hello , i have built a varactor based on the theory shown bellow, on one hand i need to sweep control voltage on the other hand i need to have Y-param for every value of control, and convert it into capacitance,so we have here multiple SP simulations for each value of CONTROL voltage, is that the correct order of simulating for creating the Capacitance vs Control plot,as shown bellow?

i know that we can use Goldengate to convert Y-param into capacitances (for certain frequency)
Thanks

ShawnLogan over 6 years ago

Dear yefj,

I am not sure if I fully understand your question "so we have here multiple SP simulations for each value of CONTROL voltage, is that the correct order of simulating for creating the Capacitance vs Control plot,as shown bellow?". However, if you are asking how to generate capacitance data as a function of control voltage for various switch settings, this can be done with a series of small-signal AC simulations. It is not necessary to use S or Y parameters. I have outlined a methodology to accomplish this a few times. The most recent description, which includes a sample test bench and computation, is at URL:

https://community.cadence.com/cadence_technology_forums/f/rf-design/38996/capacitance-vs-bias-voltage-curve-for-ferroelectric-varactor

Did you see this forum posting and does it answer any of your questions?

Shawn
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yefJ over 6 years ago in reply to ShawnLogan

i have tried to implement the method you proposed , i have done a DC sweep and ac simulation from 0 to 4G

i got a zero current on the probe as shown in the end

where did i go wrong?

Thanks
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