Band pass filter circuit

Details Band pass filter circuit Band pass filter circuit

H - Electricity

03

H

333/51

H03H 7/01 (2006.01) H03L 7/02 (2006.01) H03L 7/107 (2006.01)

Patent

CA 1044339

ABSTRACT OF THE DISCLOSURE Band pass filter circuit for a band pass filter which detects a phase difference between input and output signals of said band pass filter, and the detected output controls, via a low pass filter, a voltage controlled oscillator, the output of which controls first and second mixers connected respectively to an input side and an output side of the band pass filter, so that the output of the first mixer can be maintained at the center frequency of said band pass filter. Further, when an irregularly timed signal is received, before an input signal is synchronized, said band pass filter is provided with a wide pass band so as to pull the signal in the synchronized state in rapidly. After said input signal is pulled in said center frequency, the pass band of said hand pass filter is changed to a narrow bandwidth so as to improve the circuit noise and at the same time, a cutoff frequency of said low pass filter is changed to a lower frequency so as to improve the stability of the band pass filter circuit. - 1 -

230946

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