Patent ID: 8253460

Claim:
An oscillation circuit, comprising: a first transistor having a first source receiving a first operation voltage, a first drain, and a first gate coupled to the first drain; a second transistor having a second source receiving the first operation voltage, a second drain, and a second gate coupled to the first gate; a current source coupled between the first drain and a grounding voltage; a first inverter generating an oscillation signal and having a first input terminal, a first output terminal, and a first power terminal coupled to the second drain; an impedance unit coupled between the first input terminal and the first output terminal; and a waveform shaping circuit processing the oscillation signal; wherein the waveform shaping circuit includes a first amplifier for amplifying the oscillation signal to generate a first output signal and having a second input terminal coupled to the first output terminal, a second output terminal outputting the first output signal, and a second power terminal; wherein the first amplifier includes at least one inverter; wherein the oscillation circuit includes a third transistor having a third source receiving the first operation voltage, a third drain coupled to the second power terminal, and a third gate coupled to the second gate.