Colpitts Oscillator with Differential Pair in LTspice Stops Oscillating with Sensor Model

I'm building a project using a Colpitts Oscillator with Differential Pair, designed for ~117.6MHz. I'm using LTspice for simulation. The oscillator individually oscillates, but I need it to oscillate when I add a sensor model (as seen in the image in the circuit's feedback loop). When I add the sensor it initially wobbles and then stops, any ideas how I can fix this?

Hello
Unfortunately I don't see the picture.
Anyway, consider that LTspice (in my opinion it is the best simulator in the world) has ideal and perfect electronic components. So, if for example you are using two 1 kOhm resistors, set the first resistor to 997 Ohm and the second resistor to 1005.
Secondly, did you use a transistor capable of oscillating at that frequency?
Also, I recommend that you set a very small timestep, in simulation. The simulation will take a long time but the resolution of the points will be very high.
Finally, try to configure the UIC flag in simulation.
Best regards
Giovanni

Hi
Try this also:
https://www.eeweb.com/adjustable-analog-sine-square-wave-oscillator/

Cheers
Giovanni

It's possible that the sensor is introducing enough noise or other disturbance into the oscillator circuit to disrupt its operation. One thing you can try is to increase the gain of the amplifier stage to see if that helps the oscillator to maintain a stable output. You could also try adding a filter in the feedback loop to remove any noise or unwanted signals that the sensor might be introducing.

Another potential issue could be the value of the components in the oscillator circuit. Make sure that the component values are within the recommended range for the oscillator frequency you are trying to achieve. You may also want to try adjusting the values of the components to see if that has any effect on the stability of the oscillator.

It's also possible that the sensor itself is causing problems. Make sure that the sensor is properly calibrated and functioning correctly. You may want to try using a different sensor or a simulated sensor in your circuit to see if that makes a difference.

I hope this helps! If you have any more specific questions about your circuit, feel free to ask.