LC oscillator component values

[froten]

hello all,

when designing LC oscillators, is there a rule of thump on how to select the L & C values? How I can select these values for a specific frquency?

for example:

440pF & 0.5UH will reasonate at 10.7MHz
220pF & 1UH will reasonate at 10.7MHz
110pF & 2UH will reasonate at 10.7MHz
55pF & 4UH will reasonate at 10.7MHz

so which values are the best?

any help is very appreciated

 

[karesz]

Hi
for best Q (selectivity) the higher L/C
For circuits with higher stra&/parasitics possibly higher C, than you have some of them "on board" too:-(...
Personally I would select 110/220pF.
K.