iVenky
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In this case, it would be a good idea to start evaluating known working oscillator circuits. The present one has a positive DC feedback and thus works as a latch. It can't oscillate.I am learning about oscillators right now.
In this case, it would be a good idea to start evaluating known working oscillator circuits. The present one has a positive DC feedback and thus works as a latch. It can't oscillate.
You can change it to a slightly more reasonable construct by adding a highpass to the LC feedback path. Then it can oscillate, but the waveforms look dreadful.
There are at least these issues with the circuit besides the said DC feedback problem:
- Gain is much too high
- no stable oscillation condition
- the capacitor at the OP output is more or less useless, because it's shorted by the low impedance OP output.
Actually, it doesn't look like a regular Colpitts oscillator, which uses an inverting amplifier with some output impedance, and 180° phase shift provided by the LC circuit.
Of course, this isn't a Colpitts oscillator. I have no idea what it should be called, but it seems to work OK.
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