Annotate currents without adding the outputs to the ADE

Dear Amar,

Perhaps I am not understanding your question, but if you are looking to annotate the DC current in a component from a DC operating point analysis, yes. The currents for a resistor, active device (MOS, BJT, etc.. ) are saved as part of the DC operating point analysis and can be displayed on the schematic after the analysis using the "Annotate DC operating point" feature.

Is this what you had in mind with your question?

The command and resultant display of some current information from a DC operating point analysis are provided in Figure 1 and 2 respectively.

Shawn

My prior reply was posted when I logged in and was not completed - sorry! The figures are below.

Shawn

Figure 1

Figure 2

Hi Shawn,

Thanks for replying. Its similar to what you have explained. The "Annotate DC operating point" shows the device current(Id, I etc). I want the terminal current to be displayed in the schematic. I can do that using "Annotate DC current", but for this every terminal need to be added to the ADE output section. If I don't add the terminal it shows as "n/a" as the terminal current.

So is there any way to see the node/terminal currents without adding them to the ADE output section.

Regards,

Amar

Dear Amar,

AmarDas said:

So is there any way to see the node/terminal currents without adding them to the ADE output section.

As detailed in the Cadence On-line support RAK "Using Spectre SAVE Effectively" at URL:

https://support.cadence.com/apex/articleattachmentportal?id=a1O0V00000910oxUAA&pageName=ArticleContent&attachId=0690V000004dkHEQAY&sq=null&caseSessionKey=null

did you consider adding the following file as an include file in your ADE Simulation Files GUI?

Example filename: saves.scs

File "saves.scs" content:

simulator lang=spectre 

save *:currents depth=1 

Include the above save.scs file from the ADE GUI under the Setup > Model Libraries section. 

This will avoid you adding the terminal currents as specific outputs as ADE outputs. Does this help?

Shawn

Hi Shawn,

I am also surprised that, this didn't work for me as well. I have gone through the RAK and tried some other combinations as well.

Regards,

Amar

Dear Amar,

Is the added save statement providing the terminal currents for other blocks or subcircuit in your schematic?

Shawn

Hi Shawn,

I just noticed it shows the terminal current for Instances(block symbols) and passive devices. But not for the active devices.

Is there any switch that needs to be turned on ?

Regards,

Amar

Dear Amar,

AmarDas said:

I just noticed it shows the terminal current for Instances(block symbols) and passive devices. But not for the active devices.

Is there any switch that needs to be turned on ?

I was afraid of that! The CDF for your model must support the notation in order for it to be displayed (i.e., annotated).] I think the following every recent troubleshooting article is the most current detailing the issue you are seeing and two workarounds. I noticed that the first workaround is what you were trying to avoid as it does produce the correct terminal current in your example...but for you is not a preferred solution based on your comments in this series of posts.

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000nV5EEAU&pageName=ArticleContent

Shawn

Hi Shawn,

This helped a lot.

I saw, I had wrong terminal mapping in the CDF. I ran the tran analysis to check the terminal mapping in the result browser. After updating the same in the CDF, the issue seems to be gone and I can annotate the currents.

I really appreciate you for guiding me through out this.

Regards,

Amar

Dear Amar,

AmarDas said:

After updating the same in the CDF, the issue seems to be gone and I can annotate the currents.

Wonderful - great news! Thank you, very much, for letting us know!! Good luck in your additional simulation efforts!

Shawn