Current correction circuit, having an input and comprising: - a first controllable current source having an input connected to the circuit input for drawing a first current (I 220) from said circuit input; - a signal edge detector circuit having an input coupled to the circuit input and having an output coupled to the first controllable current source for controlling the operation thereof; - wherein the assembly of first controllable current source and signal edge detector circuit is responsive to voltage changes at the circuit input by drawing a first current pulse from said circuit input; characterised in that the current correction circuit further comprises: - a second controllable current source having an input connected to the circuit input for drawing a second current (I 240) from said circuit input; - a voltage comparator having a first input coupled to the circuit input, having a second input coupled to receive a reference signal (Vref), and having an output coupled to the second controllable current source for controlling the operation thereof; - wherein the assembly of second controllable current source and voltage comparator is responsive to a low voltage at the circuit input, lower than a level determined by said reference signal (Vref), by drawing a second current pulse from said circuit input. - a first controllable current source having an input connected to the circuit input for drawing a first current (I 220) from said circuit input; - a signal edge detector circuit having an input coupled to the circuit input and having an output coupled to the first controllable current source for controlling the operation thereof; - wherein the assembly of first controllable current source and signal edge detector circuit is responsive to voltage changes at the circuit input by drawing a first current pulse from said circuit input; characterised in that the current correction circuit further comprises: - a second controllable current source having an input connected to the circuit input for drawing a second current (I 240) from said circuit input; - a voltage comparator having a first input coupled to the circuit input, having a second input coupled to receive a reference signal (Vref), and having an output coupled to the second controllable current source for controlling the operation thereof; - wherein the assembly of second controllable current source and voltage comparator is responsive to a low voltage at the circuit input, lower than a level determined by said reference signal (Vref), by drawing a second current pulse from said circuit input. - a second controllable current source having an input connected to the circuit input for drawing a second current (I 240) from said circuit input; - a voltage comparator having a first input coupled to the circuit input, having a second input coupled to receive a reference signal (Vref), and having an output coupled to the second controllable current source for controlling the operation thereof; - wherein the assembly of second controllable current source and voltage comparator is responsive to a low voltage at the circuit input, lower than a level determined by said reference signal (Vref), by drawing a second current pulse from said circuit input.