| 摘要 |
The disclosure of the present specification relates to a bridge network suitable for use as a telephone hybrid wherein the bridge network includes at least two bridge networks in cascade, one bridge having arms which include the input and bidirectional ports of the hybrid and the nominal balancing impedance, the other sub-bridge network having arms which include the output port of the hybrid and the output circuit of an amplifier having an output signal characterized by a product of the signal applied to the input port of the hybrid and the signal from the output of the hybrid, the output circuit thereby being isolated from arms in the output port and from all other arms of the bridge which include reactive elements or characteristics.
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