Auto-tuned apparatus for band-pass filter

Details Auto-tuned apparatus for band-pass filter Auto-tuned apparatus for band-pass filter

H - Electricity

03

H

H03H 7/12 (2006.01) H03J 7/02 (2006.01)

Patent

CA 2059580

An auto-tuned apparatus for a band-pass filter, wherein, the generated reference signals having the given frequency to be set are mixed with signals to be outputted from the band-pass filter when the reference signals have been inputted to the band-pass filter so as to multiply them for outputting the signals of the multiplied results, the signals of the direct current component from the signals of the multiplied results to be outputted are filtered, and the band-pass filter is controlled so that the center frequen- cies of the band-pass filter may agree with the frequencies of the reference signal in accordance with the signal of the direct current component to be outputted, whereby the center frequency of the band-pass filter can be adjusted automatically to the desired set value with simple circuit construction and precision better than in the conventional embodiment.

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