A rectification circuit configured to generate a direct current at an output of the rectification circuit subject to an alternating voltage at an input of the rectification circuit and configured to transmit encoded information to a galvanically decoupled electronic subsystem, the rectification circuit comprising - coupling means at the input, configured to receive the alternating voltage from the galvanically decoupled electronic subsystem; - a first switch arranged between the coupling means and the output, configured to block current in a first direction and to conduct current in a second direction, opposite to the first direction, thereby contributing to the direct current; wherein a resistance of the first switch, when conducting current in the second direction, is adjustable; and - a first modulation unit configured to - receive the encoded information to be transmitted to the galvanically decoupled electronic subsystem; - map the encoded information to a sequence of modulation states from a plurality of different pre-determined modulation states of the resistance of the first switch; wherein each of the plurality of pre-determined modulation states specifies a resistance value and/or a temporal evolution of the resistance value of the resistance of the first switch; and - adjust the resistance of the first switch according to the sequence of modulation states at a clock rate derived from a cycle rate of the alternating voltage, thereby modulating the current conducted by the first switch according to the sequence of modulation states. - coupling means at the input, configured to receive the alternating voltage from the galvanically decoupled electronic subsystem; - a first switch arranged between the coupling means and the output, configured to block current in a first direction and to conduct current in a second direction, opposite to the first direction, thereby contributing to the direct current; wherein a resistance of the first switch, when conducting current in the second direction, is adjustable; and - a first modulation unit configured to - receive the encoded information to be transmitted to the galvanically decoupled electronic subsystem; - map the encoded information to a sequence of modulation states from a plurality of different pre-determined modulation states of the resistance of the first switch; wherein each of the plurality of pre-determined modulation states specifies a resistance value and/or a temporal evolution of the resistance value of the resistance of the first switch; and - adjust the resistance of the first switch according to the sequence of modulation states at a clock rate derived from a cycle rate of the alternating voltage, thereby modulating the current conducted by the first switch according to the sequence of modulation states. - receive the encoded information to be transmitted to the galvanically decoupled electronic subsystem; - map the encoded information to a sequence of modulation states from a plurality of different pre-determined modulation states of the resistance of the first switch; wherein each of the plurality of pre-determined modulation states specifies a resistance value and/or a temporal evolution of the resistance value of the resistance of the first switch; and - adjust the resistance of the first switch according to the sequence of modulation states at a clock rate derived from a cycle rate of the alternating voltage, thereby modulating the current conducted by the first switch according to the sequence of modulation states.