Here's the setup in LTspice. Unfortunately my ancient version does not seem to
support signed calculations for the current via parameters, or I do not know how
to use that feature, so it uses two current sensing sources and two switches. An
advantage is that one can simulate all sorts of interesting situations, such as
a flux gate magnetometer measuring the Earth field by setting the saturation
currents for the two semiperiods to different values.

  http://omploader.org/vNHg0cg

-- Peter


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