Help me to solve this error “NS_nuderiv is not a valid function”.

- May 23, 2024 at 4:17 pm
  
  AVISHEK DAS
  Subscriber
  
  Hi, I want to find out the frequency response of the photodetector through impulse response from the step response and then perform a Fast Fourier transform (FFT). Here, I use the "vpd_3dB_bandwidth.isf" file from the "Vertical photodetector" example.
  There is an error comes: "Error: D:/Ansys/NFET/nanosheet script/vpd_3dB_bandwidth.lsf line 16: NS_nuderiv is not a valid function or variable name"
  Can you please help me to solve that problem?
- May 23, 2024 at 5:41 pm
  
  Amrita Pati
  Ansys Employee
  
  Hi Avishek,
  Thanks for sharing the article details. I had a look at the vpd_3dB_bandwidth.lsf script file. Line 16 has the name "vpd_nuderiv;" This is a function which is already present in the same directory and we are calling it from vpd_3dB_bandwidth.lsf script. But the function name in Line 16 in your screenshot has a different name, as a result you see this error. I will recommend changing the name to the original name.
  Regards,
  Amrita