Patent ID: 8742818

Claim:
An adaptive clock signal generator with noise immunity capability, comprising: a gain amplifier for processing an analog oscillation signal to generate an amplified signal; an adjustable Schmitt trigger, coupled with an output terminal of the gain amplifier, for generating a triggered signal according to the amplified signal; an output buffer, coupled with an output terminal of the adjustable Schmitt trigger, for generating a clock signal according to the triggered signal; and a noise detector coupled with the adjustable Schmitt trigger; wherein when the noise detector is coupled with a first input signal, the noise detector detects noise components of the first input signal and enlarges a hysteresis window of the adjustable Schmitt trigger as detected noise components of the first input signal increases; wherein the noise detector comprises: a capacitive device for extracting AC components of the first input signal when coupled with the first input signal; a rectifier, coupled with the capacitive device, for generating, a rectified signal according to an output signal of the capacitive device: and a level shifter, coupled with the rectifier, for generating a first control voltage and a second control voltage according to the rectified signal.