Oscillator and operation method thereof

An oscillator comprising:

• a current source;
• a memristor;
• a switching circuit, coupled to the current source and the memristor, and configured to transmit a bias current provided by the current source to the memristor through the switching circuit, and determine a flow direction of the bias current in the memristor through the switching circuit according to at least one control signal;
• and
• a control circuit, coupled to the switching circuit to provide the at least one control signal, and configured to detect a representative voltage of the memristor, wherein the control circuit comprises a comparator that is configured to compare the representative voltage of the memristor to at least one of a first threshold voltage or a second threshold voltage to generate a comparison result, and the control circuit changes the at least one control signal according to the comparison result to change the flow direction of the bias current in the memristor through the switching circuit.