Timeline for Basic Oscillator Circuit
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Oct 10, 2017 at 14:52 | comment | added | Bimpelrekkie | @LvW Good suggestion that tunnel diode. Maybe we can say that it has feedback (or maybe feed forward) as a voltage increase causes a current decrease. In a sense it does respond actively to external parameters. | |
| Oct 10, 2017 at 14:31 | comment | added | LvW | Bimpelrekki - what about a negative-resistance oscillator using a tunnel diode? However, this is the only exception - as far as I know - from the principle you have mentioned. All other negative-resistance oscillators based on active circuits (BJT, opamp) can be explained using both principles: Negative resistance or feedback loop. | |
| Oct 10, 2017 at 13:41 | comment | added | Bimpelrekkie | The crystal itself has no input or output, it is just a resonator circuit with a very high Q factor. In order to make an any oscillator circuit feedback is needed. I challenge you to find an oscillator circuit (or even a mechanical system!) without feedback. You will not find any as these do not exist. What the crystal does is force the oscillator to oscillate at a specific frequency. | |
| Oct 10, 2017 at 13:40 | comment | added | LvW | Yes - any oscillator needs a closed loop which allows a unity loop gain (zero phase) at one single frequency only. Because each passive circuitry contains damping elements, the loop must contain an active part with gain for compensating damping effects. | |
| Oct 10, 2017 at 13:21 | comment | added | lucenzo97 | So, it would never oscillate a sine wave if there would be no feedback to its input? | |
| Oct 10, 2017 at 13:07 | history | answered | Bimpelrekkie | CC BY-SA 3.0 |