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oscilations in my amplifier ruins my PLL

 

Hello , I have built a PLL system based on the following article.
I have designed the amplifier to have some input voltage current output behavior.
but in the lab I sat that when i plug the the input I get oscilations at the output.
what could cause the situation?
3d PDF Layout and lab photos are attached.
Thanks.?
?
/g/electronics101/files/john233/layout_new_amp_updated3.pdf
?
 

Oscillations in a closed loop system are almost always caused by excessive loop gain.? Try reducing the gain in your feedback amplifier.? You should also ensure that your system is linear over the frequency range of your desired operation.? Gain instability can also be caused by amplifier non-linearities.? Check the gain on your EFC since this is a high Q device you may need to attenuate the output before sending it to the YIG mixer.

Sam
 

On Thu, Dec 5, 2024 at 10:08 AM, john23 wrote:
Hello , I have built a PLL system based on the following article.
I have designed the amplifier to have some input voltage current output behavior.
but in the lab I sat that when i plug the the input I get oscilations at the output.
what could cause the situation?
Feedback.
?
Coupling.
?
Andy
?

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