so RC oscillators have the equivalent of a very low , so the phase changes very slowly with frequency, therefore a given phase change will cause a large change in the frequency. In contrast, LC oscillators have tank circuits with high (~102). This means the phase shift of the feedback network increases rapidly with frequency near the resonant frequency of the tank circuit. So a large change in phase causes only a small change in frequency. Therefore, the circuit's oscillation frequency is very close to the natural resonant frequency of the tuned circuit, and doesn't depend much on other components in the circuit. The quartz crystal resonators used in crystal oscillators have even higher (104 to 106) and their frequency is very stable and independent of other circuit components.
so RC oscillators have the equivalent of a very low , so the phase changes very slowly with frequency, therefore a given phase change will cause a large change in the frequency. In c,ontrast, LC oscillators have tank circuits with high (~102). This means the phase shift of the feedback network increases rapidly with frequency near the resonant frequency of the tank circuit. So a large change in phase causes only a small change in frequency. Therefore, the circuit's oscillation frequency is very close to the natural resonant frequency of the tuned circuit and doesn't depend much on other components in the circuit. The quartz crystal resonators used in crystal oscillators have even higher (104 to 106) and their frequency is very stable and independent of other circuit components.