The invention relates to a charge pump circuit comprising an input node for inputting a voltage to be boosted; an output node for outputting a boosted voltage; a plurality of pumping stages connected in series between the input node and the output node, each pump stage comprising at least one charge transfer transistor, wherein the at least one charge transfer transistor is a double-gate transistor comprising a first gate for turning the transistor on or off according to a first control signal applied to the first gate and a second gate for modifying the threshold voltage of the transistor according to a second control signal applied to the second gate, wherein the first and second control signals have the same phase.