The sine wave cannot grow indefinitely; in all real oscillators some nonlinear process in the circuit limits its amplitude, reducing the gain as the amplitude increases, resulting in stable operation at some constant amplitude.
The sine wave cannot grow indefinitely. Some nonlinear process in the circuit limits its amplitude. This is in all real oscillators. Some nonlinear process in the circuit is reducing the gain as the amplitude increases. This is in all real oscillators. Some nonlinear process in the circuit is resulting in stable operation at some constant amplitude. This is in all real oscillators.