In Reply to: sine wave oscillator posted by Ajit Pachore on 07/04/01 at 10:15 AM:
I susepect that your tank circuit has insufficiently high Q in the circuit as you have configured it to suppress the harmonics that result from non-linear behavior of your oscillator's circuit elements.
I have e-mailed a circuit to you that may adaptable to your purposes. Please take a look at it and let me know how you fare with it.
The circuit is a Wein bridge oscillator combined with an AGC loop to keep the oscillator elements themselves operating linearly, with no clipping. As shown, it was used at only 1 KHz, but I think it could be reasonably scaled to 400 KHz if the op-amps are fast enough. The TL082 devices that I used may or may not be capable of this, but I thnk that there is a chance worth pursuing.
John Dunn - President