# Flicker Noise Noise Folding Question

Status
Not open for further replies.

#### teem

##### Junior Member level 1
Dear Friends:

Flicker noise is infinite at DC. If I pass flicker noise through an on/off switch with switching frequency w, what the output spectrum would be? Would the spectrum be infinite at w, 3*w, 5*w…etc?

Thanks and have a good day.

#### crutschow

Switching folds (aliases) the noise above 1/2 the switching frequency, not below.
It will have little effect on the flicker (1/F) noise.

#### zorro

Flicker noise is infinite at DC.
Speaking properly, what tends to infinity in the flicker noise model is its power spectral density.

If I pass flicker noise through an on/off switch with switching frequency w, what the output spectrum would be? Would the spectrum be infinite at w, 3*w, 5*w…etc?
It does tend theoretically to infinity, like power spectral density of phase noise tends theoretically to infinity when frequency approaches the carrier frequency.

Z

Status
Not open for further replies.

Replies
9
Views
5K
Replies
3
Views
3K
Replies
1
Views
905
Replies
0
Views
1K
Replies
2
Views
3K