Hybrid coil
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A hybrid coil (or bridge transformer, or sometimes hybrid) is a single transformer that has three windings, and which is designed to be configured as a circuit having four branches, (i.e. ports) that are conjugate in pairs. That is, a signal that arrives on one branch will be divided among the two adjacent branches and not appear on the opposite branch. Correct operation requires matched impedance.
The primary use of a voiceband hybrid coil is to convert between 2-wire and 4-wire operation in sequential sections of a communications circuit, for example in a four-wire terminating set. Such conversion was necessary when repeaters were introduced in a 2-wire circuit, a frequent practice in 20th century telephony.
Radio-frequency hybrids are used to split radio signals, including television. The splitter divides the antenna signal to feed multiple receivers.
- See also Telephone hybrid
This article contains material from the Federal Standard 1037C (in support of MIL-STD-188), which, as a work of the United States Government, is in the public domain.
