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An offsetting line terminator is shown in the drawing which is DC coupled, having high common mode rejection and gain.
English (United States)
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An offsetting line terminator is shown in the drawing which is DC coupled,
having high common mode rejection and gain.
Occasionally it is required to terminate a balanced pair of signal lines and at
the same time produce a voltage offset. When it is required to do this over a
frequency range which includes the DC components, conventional methods of
level shifting cause degradation of the terminator's common mode signal
rejection characteristics and/or significant circuit complication.
The improved line terminator 1 obviates these undesired effects. It includes a
standard operational amplifier 2 in a conventional balanced terminator
configuration coupled to a source Vs via a balanced pair of signal lines 3. Input
Rin=2R1 and the amplifier gain equals Rf/R1.
The line terminator also includes a conventional current source 4. The
constant current Is is injected into node 5 to produce the desired offset Vo while
preserving the common mode rejection. It has wide frequency response which
includes the DC component and adds little complication.