| 摘要 |
The present invention relates to a BON built-in type balanced line driver circuit which reduces the size and cost of the unit by excluding duplication of impedance circuits, excluding duplication of an unbalanced/balanced converting transformer, converting a unipolar signal to a bipolar signal, and sending out the signal to the balanced line. The BON built-in type balanced line driver circuit has a U/B converting transformer including a primary winding having an intermediate tap and a secondary winding connected to a balanced line. The U/B converting transformer further includes first and second switch circuits connected between both terminals of the primary winding, and an impedance circuit inserted between the intermediate tap and a connecting point of the first and second switch circuits. The impedance circuit has a frequency characteristic reverse to the frequency characteristic of the balanced line, and bipolar pulses contributed by the reverse frequency characteristic are outputted by making the first and second switch circuits conductive with unipolar pulse signals, alternatively.
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