A voltage burst is generated using a voltage supply having a single DC output voltage, VH coupled with a switching arrangement, including an input and a voltage transmitter output (Tx_Out), the input coupled with the output of the voltage supply. A control arrangement coupled with the switching arrangement is configured to operate the switching arrangement so as to provide, at the Tx_Out, a voltage burst that varies between an intermediate voltage, VM, and one or both of VH, and a minimum voltage, VL, where VL