Research on an Automatic Tracking Filter Based on MAX260 and Its Application

For the purpose of eliminating the noise and tracking frequency′s change automatically,the paper researches a kind of narrow-band-pass filter according to the demand of project.The filter is combined the switch capacitor filter MAX260CENG with the micropower phase-locked loop CD4046BC.The performance is reliable and its central frequency can be adjusted conveniently.In the paper,the circuit and result are given,and also can be used in the signal process.