iVenky
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I have some doubts in oscillators.
In colpitt's oscillator we use this tank circuit
This is clearly a low pass filter. But we should have band pass filter in the feedback path for an oscillator to select its frequency.
How does this provide a 180 degree phase shift (another 180 degree phase shift is provided by the CE configuration) so that we could satisfy the Barkhauson criteria?
Thanks in advance.
In colpitt's oscillator we use this tank circuit
![](https://obrazki.elektroda.pl/91_1331357705_thumb.png)
This is clearly a low pass filter. But we should have band pass filter in the feedback path for an oscillator to select its frequency.
How does this provide a 180 degree phase shift (another 180 degree phase shift is provided by the CE configuration) so that we could satisfy the Barkhauson criteria?
Thanks in advance.