leafValue data type processing in Cadence Virtuoso

Dear Senan,

Senan said:

As seen from the image below, the calculated function (accuracy in this example) is successfully calculated and plotted, however, the data type "leafValue" will not enable me to do any further data processing on the obtained signal (e.g, taking the average). The error message from the CIW is down.

Kindly I need your help to be able to process this signal

I do not know of a Calculator function "Accuracy_C". Hence, I cannot comment on the nature of its expected inputs nor its expected output. I did see in the Calculator screen shot that you used in your post  the function was used as an argument to the Calculator real() function. If the function Accuracy_C() returns a complex number, you may need to specify the real or imaginary or magnitude of its value in any future calculations you are performing.

Perhaps it is me, but the information you are providing is quite limited, and hence really is not sufficient for me to provide any other comments. Sorry!

Shawn

Shawn,

I'm assuming Accuracy_C was the name of one of the ADE outputs rather than a function, but I completely agree with your assessment that Senan didn't provide enough details - knowing what this Accuracy_C output is (what expression generated it) would be key to answering this.

Andrew

Dear Shawn and Andrew

Thank you very much for your comments on my post.

I have constructed this mathematical expression from the Calculator and saved it as an expression in the ADE Assembler as a function to compute the sensor accuracy error:

((((average(deriv(frequency(VT("/vout"))) ?overall t) * VAR("temp")) + value(frequency(VT("/vout")) 0)) - frequency(VT("/vout"))) / average(deriv(frequency(VT("/vout"))) ?overall t))

and I named it Accuracy_C

My sensor in this example is a temperature-to-frequency converter. Hence my accuracy error in °C are given in the y-axis. As I have mentioned before, this formula is giving me the correct expected graph so I have no doubt about it. Only not able to do further processing on it after the result came, as for example if I want to to apply the ymax or ymin or any other function. Please you can see the image below if that might be helpful

Best Regards

Dear Senan,

Senan said:

s seen from the image below, the calculated function (accuracy in this example) is successfully calculated and plotted, however, the data type "leafValue" will not enable me to do any further data processing on the obtained signal (e.g, taking the average). The error message from the CIW is down.

Kindly I need your help to be able to process this signal

First, thank you for the added information! It is useful to better understand the nature of your issue and question!

I have studied your results and the expression and have a couple of comments...maybe these will be useful to you to consider...

1. It appears to me that the curve you have highlighted in the plot (which you sent to the Calculator) appears to be a single corner and hence not the entire waveform. Have you tried, from the Calculator, sending the expression you have in the stack tp a table in order to see what the Calculator expression represents. If it is a single scalar, you may want to use the ?overall option to function ymax() as detailed in the Virtuoso Visualization and Analysis XL User Guide ICADVM20.1 at URL:

Virtuoso Visualization and Analysis XL User Guide -- Calculator Functions - ymax

where it states:

"When you use this function to evaluate data for measurement
across corners, a new key argument, overall, is added to
this function. If the input is a scalar and the overall
argument is set to t, the ymax function returns the input
scalar value."

2. In lieu of using the Calculator, have you tried using the ymax() or ymin() functions as an Assembler output expression? If so, does it produce the desired result?

Shawn

Dear Shawn,

Thank you very much for your help and kind response,

The second solution worked for me perfectly and computed the results with no error as you can see from the image below, hence I will keep this option in my future work.

Thank you once again and wish you nice time

Regards

Dear Senan,

  The second solution worked for me perfectly and computed the results with no error as you can see from the image below,  

Excellent! Thank you for letting us know too! Good luck with your sensor design.

Shawn

It is my pleasure Sir,