Re: simulation varactor
- From: Riad KACED <riad.kaced@xxxxxxxxx>
- Date: Sun, 23 Mar 2008 05:29:03 -0700 (PDT)
Hi Maryouma,
I would advice :
1. A simple DC sweep to plot the varactor capacitance vs voltage.
You have to connect a DC voltage source (analogLib/vdc) to your A/K
node (in case of a P/N type diode varactor) or G node (in case of a
MOS varactor).
launch ADE and choose DC and sweep the value of your VDC.
2. If you want to plot the Q factor :
2.1 You can either run an AC simulation and plot the Q-factor as the
ratio of the imaginary part to the real part of Y11 at a given
frequency. You can run mutliple simulations with a set of voltages if
you want to plot the Q-factor vs Voltage at a given frequency.
2.2 Or, Run S-parameter simulation, that's the common way to plot Q
factors.
You need for this to add the input/output ports to your schematic
(analogLib/port). Specify the port numbers in the properties of your
ports: 1 for input, 2 for output.
Specify the port resistance (default is 50 Ohm).
+ Run ADE and choose SP in the Analysis setup.
+ Under the Ports box, select the input and output ports on the
schematic
+ Select Frequency as the Sweep Variable
+ Sweep frequency from min to max with a given step
+ Run the simulation
+ Go to Results -> Direct Plot -> S-Parameter ... and Plot S11 (dB20)
(other if you want) using the S-parameter results window.
Simple as that ;-)
Please give a look to the following readings for more infos.
1. www.designers-guide.org/Modeling/varactors.pdf
2. www.cadence.com/whitepapers/pspapn1.pdf
Any other ideas folks ?
Good luck ;-)
Riad.
.
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- From: maryouma2_84
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