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Conversion from dbv to dbmicrovolt

 

Hi,

I've entered measurement data  that I obtained from the oscilloscope (time domain)  into the LTSPICE program to create the FFT signal.
I need to convert the FFT signal from dBV to dB microvolt . Could you  advise me on how to resolve this issue?

Regards,
 

Just add 120 to each dBV value. LTspice will do it with Waveform Arithmetic. But you need to get a deeper understanding of the decibel, so you wouldn't need to ask such a simple question.

On 2024-07-19 22:04, Lahmani Abdeslame via groups.io wrote:
Hi,

I've entered measurement data  that I obtained from the oscilloscope (time domain)  into the LTSPICE program to create the FFT signal.
I need to convert the FFT signal from dBV to dB microvolt . Could you  advise me on how to resolve this issue?

Regards,
-- 
OOO - Own Opinions Only
Best Wishes
John Woodgate
Keep trying

Virus-free.www.avg.com
 

One needs to be careful about where to apply the "+120" correction.
 
If you are plotting the FFT within LTspice, then multiply the voltage in the FFT plot by 1,000,000 and it will make the correct adjustment.  For example, if you plotted the FFT spectrum of V(out), right-click on "V(out)" at the top of the FFT  plot and change it to "V(out)*1e6".  Now the plotted decibels represent dBiuV of each component of the V(out) signal.
 
On the other hand, if you have extracted a table of FFT values which are in decibels, then you should add 120 to those numbers. 
 
Andy
 

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