High Frequency Oscillator...question mark

http://everycircuit.com/circuit/4554840022974464

Just decrease the caps and inductor proportionally. Don’t touch the resistors. If you want twice the frequency, divide the cap/inductor value by two. If you want ten times the frequency, divide their values by ten. As long as they maintain the same ratio you should be good until the frequency gets high enough that you have to worry about parasitic capacitance and inductance and transistor delays. Don’t forget to adjust the time scale to match! If you see the wave looking “peaky” where you can tell it’s made of straight lines because of the difference in angle in those lines when they should be smooth then that is an indicator that you should slow down the sim speed. If you can’t get it to work at a higher frequency then just give me the link.

What is 1fF reactance ( impedsnce) at 1 GHz.

Ah I tried that, and it wouldn't oscillate anymore, but I never changed the simulation time! Thanks Jason, who knew just a slower sim speed could fix everything!

PERFECT!!! Thank you thank you, now it'll go to +100KHz 😁

http://everycircuit.com/circuit/6390493490708480

Kiani, reactance and impedance are measured in Ohms

One more example how circuits can fall into chaos http://everycircuit.com/circuit/5133668267065344

It turned into chaos because of the values of the chosen inductor/capacitors in your example..?

All oscillator might have this problem, if they do have at least three energy storing components. L or C are such energy storing components. Together with a nonlinear amplifier it can go crazy. This can happen with all oscillators not just yours. I just choose random values and was surprised i found a chaotic reaction. For engineering it does mean, even you think you have a stable oscillator it might happen your oscillator gets crazy one day and your hole system fails !

Wow that's crazy, it could just fail out of nowhere!?!? So like the astable multivibrator only has 2 energy storage devices, that means it's very unstable... but with 3 or more, is it guaranteed stable? How would I know for sure if my design is reliable or not?

No wrong, 2 is stable but 3 or more can be unstable!!

Really????! I read somewhere that adding more stages (to achieve the full 360° phase shift) makes it more stable, I can't remember what site it was from, but at first I thought it made sense because I've also read how most designs use at least 3 because it's very difficult to reach a full 90° phase shift, so they are typically designed to reach 60° per capacitor × 3 for 180° + the 180° from an inverting amplifier

But that's just from something I read online, not a book

Dont mix the need of phase shift and the cause why things can get chaotic.

Ok

Chaos is only a state of organization that is more difficult to understand; its also the birth of everything new!

Right, the biggest misunderstanding is to think chaos is equal random. Chaos might look random to us but follows pattern and can be very pretty if we look from higher altidue on it.

Order from chaos is worrying, as this is the basis of theories put forward by Georg Wilhelm Friedrich Hegel. In reality his theories really refer to order from deliberately created confusion. Confusion is far from chaos.

@Hurz random is chaos, but chais is not random,,,,,, ,, random there is no repeat,,, but in chaos there can be random repeats,,,,, over time ⌚ it is ironic that patterns come out of chaos,,,

As psttern = repeats. No repeats = no pretty patterns

Three capacitors or two?! How can we really say hoe many caoacitors we have in s build circuit 💫, whith components next to each other fields, and blobs of solder, and human fat all over the circuit board,,

@issacsutt, everyone knows resustance is measured in ohms,,, what i ment was,, you have massive caoacitors if 22 uf in yiur circuit and want ti wind up frewuency to gigs... ... well nobody can helo you,, even @Lebutch, s god csn not hrlp you cause you arr going the wrong way.

@kiani, your comments are not helpful for a good discussion they look just random and chaotic

@Hurz,, i guess if you don' t like aubergines, they have nothing to offer to your taste.

I'm not gonna talk to someone who doesn't think before they speak.

Yes, the combination of bipolar mania and fat thumbs can be troubling. But don't hate.

He said God cannot help me... He doesn't even know what hes talking about, hes just blindly speaking, I do not agree with that way of thinking.

@issacsutt sorry 🙏 didn' t mean to offend you,, just wanted to say that lage size capacitors are not used in high frequency osc.. If you look at osc. Formuleas you see why..

Apolagy accepted, I understood what you were saying the first time. I had them that large at first because the oscillations died out otherwise, while trying to reach a higher frequency, till Jason helped me figure out that I just had to readjust the simulation speed.