| 摘要 |
PURPOSE:To simplify constitution by reducing the number of parts, and to reduce the disturbance of an equalized waveform. CONSTITUTION:This equalizer is equipped with a first hybrid 11 and a second hybrid 12, and the first hybrid outputs an output whose phase is the same as the input, and the second hybrid outputs the output whose phase is delayed by 90 deg. from the input. The 0 deg. terminal of the first hybrid is connected with the -90 deg. terminal of the second hybrid, and the -90 deg. terminal of the first hybrid is connected through a variable attenuator 13 with the 0 deg. terminal of the second hybrid. At this time, in the first hybrid, an area where the center frequency is set higher than a line equalization band, and an amplitude at the 0 deg. output side is decreased in a low frequency band is used.
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