E
E Minor 7
- Jan 1, 1970
- 0
Hello,
I am digging into a project requires a 10MHz crystal drives in vaccum
whereas the oscillator circuit oscillates at a 1 meter distance.
crystals terminals are connected to the signal and shield of a 1 meter
coaxial, rg316.
However my current colplitts design doesn't work now
1 meter rg316 coaxial
_______ . .... _______[op amp] __
| | |
| = (30pF) |
xtal |-------------------- | F.B.
| = (30pF)
|_______ ...... _____|
op amp is a HFA1130, non inverting config with gain about 2X
xtal intended to use as an inductor and oscillates with the 2x30pF
caps. and the feedback inserts in the mid way of the caps.
The design works OK with zero lenght, but doesn't work with a long
lead.
Does the phase delay / cap effect of the coaxial affecting the whole
matter. ?
Thanks for great help
EMinorSeven
I am digging into a project requires a 10MHz crystal drives in vaccum
whereas the oscillator circuit oscillates at a 1 meter distance.
crystals terminals are connected to the signal and shield of a 1 meter
coaxial, rg316.
However my current colplitts design doesn't work now
1 meter rg316 coaxial
_______ . .... _______[op amp] __
| | |
| = (30pF) |
xtal |-------------------- | F.B.
| = (30pF)
|_______ ...... _____|
op amp is a HFA1130, non inverting config with gain about 2X
xtal intended to use as an inductor and oscillates with the 2x30pF
caps. and the feedback inserts in the mid way of the caps.
The design works OK with zero lenght, but doesn't work with a long
lead.
Does the phase delay / cap effect of the coaxial affecting the whole
matter. ?
Thanks for great help
EMinorSeven