Opamp noise figure help

Hi All:
this article:
https://electronicdesign.com/test-m...m=email&elq2=4deaef228943423ca723f7546fa3039e

calcs Vpp noise over a freq range from the specification OPA noise figure. How is this done?
The OPA376 has a low voltage noise on the order of 7.5 nV/√Hz at 1 kHz—0.8 μV p-p from 0.1 Hz to 10 Hz.

thx
Ancel

Hi Ancel,

Is this any help: http: //www.ti.com/lit/an/snva515c/snva515c.pdf

Chuck

I ran into this which may be of interest: https://www.analogtechnologies.com/noise_measurement_amplifier.html

Mosaic said:

Hi All:
this article:
https://electronicdesign.com/test-m...m=email&elq2=4deaef228943423ca723f7546fa3039e

calcs Vpp noise over a freq range from the specification OPA noise figure. How is this done?
The OPA376 has a low voltage noise on the order of 7.5 nV/√Hz at 1 kHz—0.8 μV p-p from 0.1 Hz to 10 Hz.

thx
Ancel

Click to expand...

You need the full noise spectrum to actually calculate the total equivalent noise. It's usually in the typical curves on the data sheet. The specs above are just single data points from the curve. It's been a while, but I remember that what you do is take the frequency range of interest and then break it into segments and calculate the noise for each range then sum them up.

spec said:

Is this any help: http: //www.ti.com/lit/an/snva515c/snva515c.pdf

Click to expand...

THE classic from the 70's, still the best.

ak

AnalogKid said:

THE classic from the 70's, still the best.

ak

Click to expand...

Too true AK. It was the first text about noise that I understood.