Methods, systems, and devices for coupling a modulated voltage signal to a current loop using a variable impedance bridge
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United States of America Patent
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Dec 8, 2020
Grant Date -
Aug 31, 2017
app pub date -
Aug 28, 2014
filing date -
Aug 28, 2014
priority date (Note) -
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Abstract
A system for coupling a modulated voltage signal onto a current loop between a host device and a field device, in various embodiments, can include a circuit and an impedance bridge. The circuit is configured to flow current from the field device between two terminals of an input circuit in the host device, wherein the two terminals are included in the current loop. The impedance bridge is positioned between the two terminals and configured to modulate impedance to convert the current in a field loop produced by the field device into terminal voltage modulation, without introducing a DC voltage burden to the current.
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