Band-pass filter circuit

Details Band-pass filter circuit Band-pass filter circuit

H - Electricity

03

H

333/55

H03H 7/12 (2006.01) H03H 11/04 (2006.01) H03L 7/10 (2006.01)

Patent

CA 1143445

ABSTRACT OF THE DISCLOSURE A band-pass filter circuit which is composed of a band- pass filter for removing noise components from an input sine wave, a phase detector for detecting a phase difference between input and output signals of the band-pass filter, a loop filter supplied with the output from the phase detector, and automatic control means for effecting control by the output from the loop filter so that a differnece between the frequency of the input sine wave and the center frequency of the band-pass filter is reduced to zero. In the case of achieving carrier recovery in a burst mode, the loop filter selected to fit for each particular purpose is used, by which high-speed pulling-in is possible even if a narrow-band filter is employed as the band-pass filter for the removal of noise components. Also, high-speed and high-precision pulling-in is achieved when many bursts of different frequencies are applied in one frame period. Further, when common and individual frequency variations exist at the same time, high-speed pulling-in is also achieved for each burst. - 1 -

320357

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