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Author Topic: Simple Wikipedia circuit does not simulate  (Read 1837 times)
SirCut
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« on: January 06, 2015, 10:42:56 AM »

(Reposted (and in Tina Desktop) because I did not know if the other area got much traffic).

Frustrated here. In Tina 9.3.80.276 CV,  an exact and simple Colpitts oscillator circuit shown on the wikipedia page below does not work (simulate or oscillate).

Please help. The simple wikipedia circuit does not simulate at:

http://en.wikipedia.org/wiki/Colpitts_oscillator

see figure 3. ( http://en.wikipedia.org/wiki/Colpitts_oscillator#mediaviewer/File:NPN_Colpitts_oscillator_collector_coil.svg )

Circuit does not simulate (oscillate) even when I do Analysis->transient and set the options "zero initial values" or "use initial conditions". It almost did not work for "find operating point" but it did finally give SOME result only for "find operating point" when I change the analysis parameter "maximum Step time" to small value of 100p. However I do not trust the result because "initial conditions" and "zero initial values" still does not work.

So:
"find operating point"    -> untrusted but some simulation output
"zero initial values"       -> no work!
"use initial conditions"   -> no work!

So is Wikipedia wrong?
Tina Wrong?
Something else I am missing?

Please help.

Thanks
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Panometric
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« Reply #1 on: May 17, 2017, 02:08:55 PM »

I've had issues where the schematic looks complete, but T junctions are missing the connector. This editor likes to do that.

If you are sure it's not that, post your file.
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horvatht
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« Reply #2 on: May 18, 2017, 02:25:39 PM »

I've checked this circuit in Tina 9 and it worked for me, the oscillator started to oscillate with a decreasing amplitude of oscillation.
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