Abstract: A delay circuit comprises a first inverter, a resistor, a first capacitor and a second capacitor. The first inverter comprises an input end and a first node and an input signal is received by the input end. The resistor is coupled between the first node and a second node. The first capacitor is coupled between the second node and a voltage source. The second capacitor is coupled between the second node and a ground.

Abstract: An oscillator comprising a compensation circuit, an oscillating module and a controller are disclosed. The compensation circuit comprises a charging circuit and a discharging circuit. The charging circuit comprises a first current source coupled between a voltage source and a second transistor, and the second transistor having a second first terminal coupled to a first current source, a second second terminal coupled to a first node, and a second gate for receiving a first switching signal. The discharging circuit comprises a third transistor having a third first terminal coupled to the first node and a third gate for receiving a second switching signal, and a second current source coupled between the third transistor and ground. The oscillating module couples between the compensation circuit and the controller and generates an output signal. The controller generates the first switching signal and the second switching signal according to the output signal.