Abstract: With AT 89S52 single-chip microcomputer as the control core and X9241M digital potentiometer, a programmable filter with adjustable cutoff frequency is designed by selecting resistors of different resistance values in the digital potentiometer through software. The experimental results show that when the cutoff frequency of the programmable filter is stepped from 6 kHz to 20 kHz, the cutoff frequency error is not greater than 10%. The system can be used for filtering of acquisition system signals.
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