Hi, I have a question about flicker noise calculation.

Yunsik Chung

Intellectual 1150 points

Other Parts Discussed in Thread: OPA827

Hi, I have a question about flicker noise in precision lab.

In the lecture, he normalized enf like above equation.

What do you mean exactly the meaning of normalizing like above?

is this some kind of process to calculate the value of slope?

How come normalizing makes above graph function to [e.n.normal * {1/root(f)}] ?

Always appreciate your support.

Thanks,

Yun

over 5 years ago

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Yunsik,

don't know where you have this text from. But the correct term is "normalized to a bandwidth of 1Hz" and not "normalized to 1Hz".

Kai

0 Tim Claycomb over 5 years ago in reply to kai klaas69

TI__Genius 15410 points

Hi Kai and Yunsik,

What this equation does is calculates the voltage noise along the 1/f curve at 1Hz. For example, if we look at the exercises and solutions for noise video 3 we see that the OPA827 is used. Step "C" in the exercises calculates the voltage noise of the OPA827 at 1Hz to be 19nV. If we look the noise curve in the OPA827 datasheet we see that at 1Hz the voltage noise is ~19nV.

Thank you,

Tim Claycomb