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Brilliant solution vfone!
Indeed, by removing inductance L3 and increasing the series R2.RF, the oscillations disappeared!
Obviously you are an expert on the subject and I especially appreciate your advice.
To the others, thank you very much also for your contributions. I'll take them into...
Okay, I thank you very much for your valuable advice.
I will follow you strictly on the next prototype but, I need this current one to work now and it does it perfectly with the wire at that position.
So I ask anyone who comes up with a solution to replace it to help me so I don't have to try...
Thank you for your advice but, indeed, the manufacturer's suggested layout has been followed and below this layer the mass is connected to GND through some via (those small gray circles) that are not shown in the figure by clarity.
Thanks for your support.
Indeed, for constructive reasons.
This is the RF side. There's not much I can do now. Maybe the modification or added/removed of some passive component?
(Note the frequency is "only" 40 Mhz)
Also, I would be interested to understand why the circuit works by...
Thank you for your advice. I'll try it later.
The circuit is part of a mixer that detects shifting in that frequency caused by the alteration of the dielectric present in an electric field generated by two planes (as plates of a capacitor, one the emitting antenna and another the receiving one)...
In the construction of an RF amplifier circuit at 40MHz using this component, I find that this oscillation disappears only if I place a straight and vertical wire of 20 mm at the output and parallel to the receiving antenna.
I must clarify that this circuit captures the signal of an antenna...
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