Here is a Multisim LabVIEW VI that incorporates 2 methods of calculating Signal to Noise ratio (SNR) based on posts that have been done in previous LabVIEW forums. You can use this in circuits (such as amplfier circuits) while performing a SPICE transient analysis to measure the signal to noise ratio based on 2 methods.
Here are the NI links describing the 2 slighly different methods used for calculating SNR...
Method 1 -> no link available
Method 2 -> Reference: http://forums.ni.com/t5/Dynamic-Signal-Acquisition/SNR-measurement-VI/m-p/224168
There are some assumptions that are built into these calculation methods, so please look through the definitions for more information.
To use, place the contents of the zip folder in the folder "C:\Program Files\National Instruments\Circuit Design Suite 11.0\lvinstruments" (except for the .ms11 examples - you can place those on your desktop or other working directory). Relaunch Multisim and the SNR instrument will be available from the LabVIEW drop down icon on the right (or top) of the screen for use in your own circuit simulations.
I provided 2 simple Multisim v11 examples to try.
This instrument was created with LV 2010; to use previous versions of LabVIEW instruments, check here:
Ensure Compatibility of NI LabVIEW Based Instruments Across Different NI Multisim Versions
SNR_bw (SNRv2) was added to adjust for SNR over a specified bandwidth (both versions included in the zip file)
Regards,
Pat N
