ADAPTIVE CLOCK SIGNAL GENERATOR WITH NOISE IMMUNITY CAPABILITY

摘要

An adaptive clock signal generator with noise immunity capability is disclosed, including a gain amplifier for processing an analog oscillation signal to generate an amplified signal; an adjustable Schmitt trigger, coupled with the gain amplifier, for generating a triggered signal according to the amplified signal; an output buffer, coupled with the adjustable Schmitt trigger, for generating a clock signal according to the triggered signal; and a noise detector coupled with the adjustable Schmitt trigger. The noise detector detects noise components of an input signal and enlarges the hysteresis window of the adjustable Schmitt trigger as the level of detected noise increases.

主权项

1. 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 an analog-to-digital converter, coupled with the rectifier, for converting the rectified signal into a plurality of digital control codes.