I can't find out any design issue in your post.
Your questios are no more than very easy usage of very specific tool.
Do two AC or SP analyses.
(1) AC with dc voltage sweep for varactor alone
(2) AC or SP analysis with dc voltage sweep for phase shifter
You can get capacitance from (1).
You can get phase shift from (2).
Here you can also do (1) in (2) by placing replica varactor for evaluation of capacitance.
Then use "plot_vs()" function.
http://edocs.soco.agilent.com/display/ads2009/plot+vs%28%29Read all documents of Agilent ADS surely.The followings are general notes for you.
- Always describe vendor's name which you use as tool or simulator.
- Don't do multiple posts which are same content.
- Don't request source code or behavioral model without any efforts.
- There are many simulators which have analyses called as PSS, PAC and Pnoise.
- Describe in detail with using correct terminologies.
- Warnigns are different from Errors.
- ADS is not name of simulator.
- There is no tool which name is Cadence.
- Don't use Direct Plot of Cadence ADE blindly without knowing definition.
- All gains in Direct Plot of Cadence ADE are "right", "true" and "practical" voltage gain.
- Don't mix up Simulation with Post Processing. They are completely different phase.
- MATLAB are different from Simulink.
- Learn measurements using actual instruments. Not "EDA Tool Play