Varactor model in ADS

[redhat]

varactor model

Hello,
I have made a varactor model in ADS like the one in this tutorial:
**broken link removed**
the problem is that when i put this subnetwork into the original design and simulates it ,two errors occur "Undefined parameter used by '.X1.V1'" the other one is "Unresolved references:X1.V1" , i use "parameter sweep" and "transient" analysis where X1 is the varactor name and V1 is the parameter that i change in the varactor which has a value "vcntrl" and vcntrl is the variable that i sweep.

Regards,
redhat

 

[biff44]

ads varactor

Not that familiar with ADS, but make sure you do something to model the storage capaciatance of the bulk diode. You might have a 0.2 pF diode, but under some large signal conditions it could act 20X bigger capacitance than that.

 

[boy]

varactor ads

First open the varztor.dsn. then, go to file menu and select "Design parameter" in the drop down list.

 

[redhat]

varactor diode model

hello boy,
i have done that , V1 is defined as a parameter and its default value is "vcntrl" which is changed from outside the model using parameter sweep, i don't know what is wrong.

 

[boy]

ads varactor diode

hi, redhat
is your set up work ok with HB simulation? i just doubt that transient simulation will not work in some cases. I am used to out an inductor with Q in the transient simulation, it does not work while it work ok in HB simulation.

 

[redhat]

varactor in ads

is your set up work ok with HB simulation?

i don't know, i am not familiar with ADS. what could make such an error?

 

[boy]

ads varactor model

You might try to test it by changing "transient" analysis to "harmonic balance" analysis. you need to put "osc port" in the harmanic balance analysis, dont forget.

 

[sunn]

varactor diode models

Basically its just a simple S-parameter simulation with parameter sweep option, didnt need HB.

for debuging, you can refer my project file created by AD$ 1.5

 

[redhat]

varactor diode ads

thanks for your help, the error was because i haven't initialized the "Vcntrl" variable.

 

[jack_peng]

how to sweep varactor in ads

Thank for your referance!!

 

[nnayak82]

Hey Guys
I downloaded the project provided by Sunn. However, I was not able to simulate it . Please help

 

[uroddy]

Which is the error? Do you have problems opening the circuit or just simulating?

 

[amihomo]

Hi
Here are some introductory tutorials on ADS:

**broken link removed**
**broken link removed**
**broken link removed**
**broken link removed**

regards

 

[leoh1223]

Hi amihomo

Do you have the access to the rest of the course material on the website? please do tell.

Thanks.

Leo

 

[neo1617]

this is the link :
**broken link removed**

 

[leoh1223]

hi neo617,

i meant the link :

**broken link removed**
some of the useful docs on the website are restricted. It will be great if you have the access.

 

[Jim cage]

Does anyone have the password for Mark Wickert's lecture notes? I've been looking for them for years but couldnt view his lecture notes