A circuit comprising: a transmitter circuit operating in at least an enabled mode and a disabled mode, the transmitter circuit comprising a transmitter output stage including a first and second device (106, 108), the first and second device (106, 108) having a respective first node (P,N) and a second node (VDD_HV; VSS); a first and second voltage control circuit (202, 204, 300) coupled only during the disabled mode to the respective first node (P, N) of the first and second device (106,108), each voltage control circuit including: a current source (322;326) configured to either source current to or sink current from the respective first node (P;N); a voltage difference detector including an output for providing an indication of a measured voltage difference between the respective first node (P;N) and the respective second node (VDD_HV;VSS); a current source control circuit including a first input to receive the indication of the measured voltage difference and an output to control current sourced to or sinked from the respective first node (P;N) by the current source to limit a voltage difference between the respective first node (P;N) and the respective second node (VDD_HV;VSS) based on a comparison between the indication of the measured voltage difference and an indication of a target voltage difference received by the first and second voltage control circuit; wherein the current source of the first voltage control circuit is configured to control current sourced to the first node of the first device and the current source of the second voltage control circuit is configured to control current sinked from the first node of the second device. a transmitter circuit operating in at least an enabled mode and a disabled mode, the transmitter circuit comprising a transmitter output stage including a first and second device (106, 108), the first and second device (106, 108) having a respective first node (P,N) and a second node (VDD_HV; VSS); a first and second voltage control circuit (202, 204, 300) coupled only during the disabled mode to the respective first node (P, N) of the first and second device (106,108), each voltage control circuit including: a current source (322;326) configured to either source current to or sink current from the respective first node (P;N); a voltage difference detector including an output for providing an indication of a measured voltage difference between the respective first node (P;N) and the respective second node (VDD_HV;VSS); a current source control circuit including a first input to receive the indication of the measured voltage difference and an output to control current sourced to or sinked from the respective first node (P;N) by the current source to limit a voltage difference between the respective first node (P;N) and the respective second node (VDD_HV;VSS) based on a comparison between the indication of the measured voltage difference and an indication of a target voltage difference received by the first and second voltage control circuit; wherein the current source of the first voltage control circuit is configured to control current sourced to the first node of the first device and the current source of the second voltage control circuit is configured to control current sinked from the first node of the second device. a current source (322;326) configured to either source current to or sink current from the respective first node (P;N); a voltage difference detector including an output for providing an indication of a measured voltage difference between the respective first node (P;N) and the respective second node (VDD_HV;VSS); a current source control circuit including a first input to receive the indication of the measured voltage difference and an output to control current sourced to or sinked from the respective first node (P;N) by the current source to limit a voltage difference between the respective first node (P;N) and the respective second node (VDD_HV;VSS) based on a comparison between the indication of the measured voltage difference and an indication of a target voltage difference received by the first and second voltage control circuit; wherein the current source of the first voltage control circuit is configured to control current sourced to the first node of the first device and the current source of the second voltage control circuit is configured to control current sinked from the first node of the second device.