Self-adjusting oscillator for a USB connectivity interface

A self-adjusting oscillator for a universal-serial-bus (USB) connectivity interface comprising:

• at least a voltage controlled oscillator for generating a USB synchronously oscillating signal to a USB electronics circuit;
• the synchronous frequency in the USB synchronously oscillating signal is used as the base frequency for the circuit in the USB electronic equipment;
• at least a frequency feedback calculating and adjusting unit connects with a USB connectivity interface for capturing synchronous signals of the USB D+ data line and D− data line, receiving the synchronous frequency feedback generated by the voltage controlled oscillator;
• calculating and determining the ratio value between the captured synchronous signals of a USB D+ data line and D− data line and the synchronous frequency feedback from the voltage controlled oscillator;
• based on the determined result of the ratio value, a frequency adjusting signal is transmitted to the voltage controlled oscillator to relatively adjust the speed of the synchronous frequency generated by the voltage controlled oscillator.