A transmitter circuit for generating a modulated signal in a transmitter of an integrated circuit, the transmitter circuit comprising: a multiplexing stage having a multiplexing circuit configured to receive a differential input signal and to generate a differential output signal at a first output node of a first current path and at a second output node of a second current path, the first and second current paths being provided in the multiplexing stage and being established as paths between a reference voltage (AVTT) and a ground voltage, wherein the multiplexing circuit comprises a differential multiplexing circuit having: a first multiplexer portion configured to receive the differential input signal and a clock signal, and the differential output signal is generated at the first output node and the second output node in response to the clock signal, and a second multiplexer portion configured to receive a second differential input signal of the differential multiplexing stage and an inverted clock signal, and the differential output signal is generated at the first output node and the second output node in response to the inverted clock signal; the multiplexing stage having: a gain circuit configured to increase the swing of the differential output signal generated at the first output node and the second output node, and a second gain circuit configured to increase the swing of the differential output signal generated by the second multiplexing portion at the first output node and the second output node. a multiplexing stage having a multiplexing circuit configured to receive a differential input signal and to generate a differential output signal at a first output node of a first current path and at a second output node of a second current path, the first and second current paths being provided in the multiplexing stage and being established as paths between a reference voltage (AVTT) and a ground voltage, wherein the multiplexing circuit comprises a differential multiplexing circuit having: a first multiplexer portion configured to receive the differential input signal and a clock signal, and the differential output signal is generated at the first output node and the second output node in response to the clock signal, and a second multiplexer portion configured to receive a second differential input signal of the differential multiplexing stage and an inverted clock signal, and the differential output signal is generated at the first output node and the second output node in response to the inverted clock signal; the multiplexing stage having: a gain circuit configured to increase the swing of the differential output signal generated at the first output node and the second output node, and a second gain circuit configured to increase the swing of the differential output signal generated by the second multiplexing portion at the first output node and the second output node. a gain circuit configured to increase the swing of the differential output signal generated at the first output node and the second output node, and a second gain circuit configured to increase the swing of the differential output signal generated by the second multiplexing portion at the first output node and the second output node.