1. A compensation circuit that produces a compensation signal to reduce the magnitude of the differential offset voltage between DC components of noninverted and inverted output signals generated by a differential amplifier having an offset control input terminal to control the DC differential offset of the noninverted and inverted output signals of said differential amplifier, said compensation circuit, comprising: an isolation circuit that isolates the DC components from AC components of each of the noninverted and inverted output signals from said differential amplifier to provide a differential signal proportional to said differential offset voltage; and an amplifying circuit that amplifies said differential signal and generates said compensation signal proportional to said differential offset voltage, said compensation signal being fed back to said offset control input terminal to control the DC differential offset of said differential amplifier to reduce said differential offset voltage.