about varactor simulation

[balakrishna.k @nit calicu]

can any one help me to simulate varactor in cadence
i am designig a vco for 880M to 960Mhz ..
how to choose varactor charactrstics
and how to see the c-v characterstics .....
please help me....

 

[Mobil]

On Oct 14, 5:00 pm, "balakrishna.k @nit calicut" <kbksha...@gmail.com>
wrote:

can any one help me to simulate varactor in cadence
i am designig a vco for 880M to 960Mhz ..
how to choose varactor charactrstics
and how to see the c-v characterstics .....
please help me....

Put a port on the gate of your varactor and run sp simulation, then
using this equation for capacitance calculation:
(imag(yp(1 1 ?result "sp")) / real(yp(1 1 ?result "sp"))).
If you sweep the voltage, you will get the curve you want.

 

[Mobil]

On Oct 15, 6:31 pm, Mobil <mobil...@gmail.com> wrote:

On Oct 14, 5:00 pm, "balakrishna.k @nit calicut" <kbksha...@gmail.com
wrote:

can any one help me to simulate varactor in cadence
i am designig a vco for 880M to 960Mhz ..
how to choose varactor charactrstics
and how to see the c-v characterstics .....
please help me....

Put a port on the gate of your varactor and run sp simulation, then
using this equation for capacitance calculation:
(imag(yp(1 1 ?result "sp")) / real(yp(1 1 ?result "sp"))).
If you sweep the voltage, you will get the curve you want.

Sorry, above is the calculation for Q.
For the cap value, the equation is (imag(yp(1 1 ?result "sp")) / (2 *
pi * xval(yp(1 1 ?result "sp"))))