Signal transmission devices

Details Signal transmission devices Signal transmission devices

1984-03-09

1985-11-26

Dwyer, James L.

Geometrical instruments

179170D, 339119R, H04B 336

Patent

active

045555990

ABSTRACT:
A signal transmission device capable, for example, of use as a hybrid circuit in a voice frequency telephone transmission system, comprises a controllable substantially load independent current source shunting a signal path between input and output ports of the device. The shunt path is de-coupled from a signal source or load to be connected to respective ports of the transmission device by series connected impedances which are high in relation to those of the respective source or load, while the current source is arranged to respond to a voltage signal applied to the input port in order to drive corresponding currents through the impedances. A current steering circuit is provided to determine the relative magnitudes of the currents driven through the respective impedances, and thus to determine the virtual impedances presented to the signal source and load as well as the signal gain of the device.

REFERENCES:
patent: 3818151 (1974-06-01), Chambers, Jr. et al.
patent: 3989906 (1976-11-01), Kiko
patent: 3989907 (1976-11-01), Chambers

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