Signal transmission devices
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United States of America Patent
Stats
-
Nov 26, 1985
Grant Date -
N/A
app pub date -
Mar 9, 1984
filing date -
Mar 18, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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