Document Type and Number:
Japanese Patent JPS5641010
Kind Code:
B2
Abstract:
A band pass filter circuit for a band pass filter comprises a phase detector connected to the band pass filter for determining the difference in phase between input and output signals of the band pass filter. A voltage controlled oscillator coupled to the phase detector has a frequency of oscillation controlled by detection output signals of the phase detector. A first frequency converter is connected to the input of the band pass filter. Input signals are supplied to the first frequency converter. A second frequency converter is connected to the output of the band pass filter and to the voltage controlled oscillator and provides an output signal. A phase control circuit connected between the voltage controlled oscillator and the first frequency converter varies the phase of output signals of the voltage controlled oscillator and controls the frequency conversion of the first frequency converter in accordance therewith.
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Application Number:
JP5915372A
Publication Date:
September 25, 1981
Filing Date:
June 14, 1972
Export Citation:
International Classes:
H03H7/01; H03H19/00; H03H21/00; H04B3/04; H04L27/227
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