A
Andrew Holme
- Jan 1, 1970
- 0
I've got a 10 MHz crystal oscillator :
http://www.iqdfrequencyproducts.com/products/details/181/
mounted on FR4 and phase-locked to an external standard.
Triggering my 'scope off the external standard, at 1ns per cm, I can see
some very low frequency jitter on the XOSC output. If I tap the XOSC or
even just press on the board around it, the XOSC output edge moves hundreds
of ps!
My PLL loop bandwidth is only ~ 1 Hz and it looks like I need to increase it
by an order of magnitude at least to reduce this jitter; but I'm shocked
that the XOSC is so microphonic!
Is this normal?
http://www.iqdfrequencyproducts.com/products/details/181/
mounted on FR4 and phase-locked to an external standard.
Triggering my 'scope off the external standard, at 1ns per cm, I can see
some very low frequency jitter on the XOSC output. If I tap the XOSC or
even just press on the board around it, the XOSC output edge moves hundreds
of ps!
My PLL loop bandwidth is only ~ 1 Hz and it looks like I need to increase it
by an order of magnitude at least to reduce this jitter; but I'm shocked
that the XOSC is so microphonic!
Is this normal?