Dither amplitude correction for constant current drivers

A switched driver circuit for generating a switched drive signal including a dither waveform, the switched driver circuit comprising:

• a dither generator circuit having a clock input and being configured to generate a dither signal based on the clock input;
• a first comparator in electrical communication with the dither generator circuit and configured to generate an upper threshold signal based on the dither signal;
• a second comparator in electrical communication with the dither generator circuit and configured to generate a lower threshold signal based on the dither signal;
• a gate control circuit in electrical communication with the first and second comparator to receive the upper and lower threshold signal, the gate control circuit being configured to generate the switched drive signal;
• a dither correction circuit in electrical communication with the first and second comparator to receive the upper and lower threshold signal, the dither correction circuit being configured to suspend the dither signal when the upper or lower threshold signal is not received within a first predefined time period.