how the low frequency noise generated?

[lhlbluesky]

when testing my power ic, i have found a low frequency noise at clock output (noise at 1hz or lower), but there is no circuit module working at so low frequency. and can it be flicker noise (opamp or comparator)?
thanks.

 

[crutschow]

It could be flicker (1/f) noise.
What's it's amplitude?
Why are you worried about low frequency noise on a clock output?

 

[lhlbluesky]

i observed clock jitter at very low frequency (1Hz or lower). that is, for every 1s period, there is a change in total clock time (1s+deltaT), and deltaT is random. besides, for my circuit, clock frequency f=1M, clock must be as accurate as possible.
thanks.

 

[crutschow]

Flicker noise could cause that jitter. One cure is to find the source of the jitter in the circuit chain and replace it with a lower noise device.