a really simple question about lc-tank

[zyyang]

Hi,all
i connect a 1nH inductor and 1pF cap parallel, how could i make the lc-tank oscillate steadily.
Thank you!

 

[cdh7]

Hi,

You'll need to use an LC oscillator circuit such as the Harley or Colpitts oscillator. These include the necessary feedback to keep the tank circuit oscillating steadily.

1pF is pretty small. Unless you construct the circuit very carefully, you're likely to have some parasitic inductance that will significantly change the frequency of oscillation.

Regards,
Chris

 

[keith1200rs]

1pF is pretty small

and so is 1nH! Not the best way to make a 5GHz oscillator, I think!

Keith.