Current modulation circuit, a driving circuit, and a method for driving a lighting load with current modulation

A current modulator circuit for modulating a drive current through a lighting load, comprising:

• a current modulating element for modulating the light output of the lighting load based on a data input signal, wherein the current modulating element is adapted to be connected in series with the lighting load;
• and
• a feedback system for controlling the current modulating element thereby to implement modulation of the current through the lighting load, wherein the feedback system comprises:
• a first feedback control path having as input a voltage across the current modulating element, wherein the first feedback control path comprises a comparator arrangement for comparing a measured voltage across the current modulating element with a reference voltage and a low-pass filter between an output of the comparator arrangement and a control input of the current modulating element;
• and
• a second feedback control path having as input the data input signal.