Method and apparatus for galvanically isolated voltage sensing circuit. A
circuit includes a scaling device that provides a scaled signal of an input voltage
to a modulator. An oscillator provides a carrier frequency to the modulator, the
modulator modulating the scaled signal with the carrier frequency to produce a
modulated scaled signal. An isolation transformer is coupled to an output of the
modulator. The isolation transformer receives the modulated scaled signal. A demodulator
is coupled to an output of the isolation transformer and demodulates the modulated
scaled signal to produce an input voltage signal representative of the scaled signal.
