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Can anyone help me in designing this variable frequency colpitt oscillator?
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I am basically trying to achieve a variable frequency colpitt oscillator by using a varactor diode to achieve frequency change. However, I am having trouble figuring out how to connect it so that it does not affect the output voltage. As you can see, the diode's anode and the output have the same node. So the output of the oscillator affects the varactor diode which is not what I want. Is there anyway to provide biasing to the varactor diode independently so that I can connect it as a capacitor at the output but the biasing doesn't affect the main circuit. I hope I worded my question properly. Do let me know if it's not clear what I am trying to ask.

Basically what I mean is, how do I control the varactor diode independently in the following circuit.

https://preview.redd.it/kpitm9nnou471.png?width=692&format=png&auto=webp&s=6f4c26d86b97e4d69eb9b80726c9f9c7b352b1d0

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3 years ago