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Design of Digital Programmable Control Filter

HE Xing-hua(Anqing Gongjiao Executives College,Anqing 246005,China)  
This paper designs a kind of programmable control filter based on Instrument amplifier,switch condenser filter、DDS、MCU and LCD in which the input small-signal is amplified by the MUC and responsible for the process of high and low filter.We use the direct digital frequency synthesis technology to achieve the digital control for the cut-off frequency to low and high pass filter.
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