 condition by monitoring the input signal or by monitoring an error signal representative of a difference between the input signal and a reference level. The low power detector may include a window comparator. The window comparator may have a hysteretic transfer characteristic. The switching amplifier may include a feedback path from a terminal of the first reactive element to the switch controller for limiting the differential output signal. A corresponding feedback path from the second reactive element to the switch controller may not be present. The first and third pairs of transistor switches may be actively switching when the low input signal level condition is not detected. The first and third pairs of transistor switches may be disabled by the low signal level detector when the low input signal level condition is not detected. The 