Comparator module and oscillator using the same

An oscillator, comprising:

• a comparator module, comprising:
• a bias current generating circuit, having a first end, a second end and a third end, and configured to receiving a supply voltage to generate a bias current;
• a bias current source, configured to accept the bias current;
• a first transistor, electrically connected between the first end and the bias current source, and configured to receive a reference voltage;
• a second transistor, electrically connected between the third end and the bias current source, and configured to receive a first voltage;
• and
• a third transistor, electrically connected between the second end and the bias current source, and configured to receive a second voltage;
• wherein the first transistor is turned on by the reference voltage as a bias voltage, to make a first bias sub-current of the bias current flows to the bias current source, and one of the second transistor and the third transistor is turned on based on the reference voltage, the first voltage and the second voltage, to make a second bias sub-current of the bias current flow through the one of the second transistor and the third transistor which is turned on to the bias current source;
• wherein the second end is configured to generate a first comparison result signal, and the third end is configured to generate a second comparison result signal;
• and
• an output stage circuit, configured to receive the first comparison result signal and the second comparison result signal to generate an oscillation signal.