| 摘要 |
A noise restricting device and method of an ultrasonic sensor system are provided to effectively cut off noise generated in amplifying by using an operational amplifier with non-linear amplification characteristic for each voltage level. A device for restricting noise of a received signal to be processed in a microcomputer(150) in a system having an ultrasonic sensor(110) and the microcomputer processing the signal received in the ultrasonic sensor includes a non-linear amplifier(140) for non-linearly amplifying the signal received into the ultrasonic sensor according to a gain control value and outputting the amplified signal, and a detector(130) for detecting the signal level received in the ultrasonic sensor, supplying a first gain control value as the gain control value of the non-linear amplifier if the detected signal level is higher than a pre-set level, and supplying a second gain control value lower than the first gain control value as the gain control value if the detected level of the signal is lower than the pre-set level.
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