A transmitter comprising: a plurality of switched capacitor transmitter circuits, SCPAs, each SCPA (400; 610) of the plurality of SCPAs comprising a first plurality of capacitors (C sp <1>,..., C sp <N>) and a second plurality of capacitors (C sm <1>,..., C sm <N>), wherein each capacitor of the first (C sp <1>,..., C sp <N>) and the second (C sm <1>,..., C sm <N>) plurality of capacitors has a first terminal switchably coupled between a power supply terminal and a reference voltage terminal and wherein each SCPA of the plurality of SCPAs has a different supply voltage (VDD 1,..., VDD M); and an inductive power combiner network comprising a distributed transformer, and having a plurality of inputs coupled to a plurality of outputs of the plurality of SCPAs, wherein the inductive power combiner network is configured to combine voltages from the plurality of SCPAs to produce a combined voltage at an output of the transmitter; wherein each of the plurality of SCPAs further comprises a first inductor and a second inductor and differential outputs (outp, outm), wherein a first output (outp) of the differential outputs of each SCPA (400; 610) is coupled to a first terminal of an inductive element in the distributed transformer, and a second output (outm) of the differential outputs of each SCPA (400; 610) is coupled to a first terminal of a different adjacent inductive element in the distributed transformer; wherein, within each SCPA (400; 610), each capacitor of the first plurality of capacitors (C sp <1>,..., C sp <N>) comprises a second terminal coupled to a first terminal of the first inductor; wherein, within each SCPA (400; 610), each capacitor of the second plurality of capacitors (C sm <1>,..., C sm <N>) comprises a second terminal coupled to a first terminal of the second inductor; and wherein a second terminal of the first inductor (450, Lsp) is connected to the first output (outp) of the differential outputs and a second terminal of the second inductor (451, Lsm) is connected to the second output (outm) of the differential outputs. a plurality of switched capacitor transmitter circuits, SCPAs, each SCPA (400; 610) of the plurality of SCPAs comprising a first plurality of capacitors (C sp <1>,..., C sp <N>) and a second plurality of capacitors (C sm <1>,..., C sm <N>), wherein each capacitor of the first (C sp <1>,..., C sp <N>) and the second (C sm <1>,..., C sm <N>) plurality of capacitors has a first terminal switchably coupled between a power supply terminal and a reference voltage terminal and wherein each SCPA of the plurality of SCPAs has a different supply voltage (VDD 1,..., VDD M); and an inductive power combiner network comprising a distributed transformer, and having a plurality of inputs coupled to a plurality of outputs of the plurality of SCPAs, wherein the inductive power combiner network is configured to combine voltages from the plurality of SCPAs to produce a combined voltage at an output of the transmitter; wherein each of the plurality of SCPAs further comprises a first inductor and a second inductor and differential outputs (outp, outm), wherein a first output (outp) of the differential outputs of each SCPA (400; 610) is coupled to a first terminal of an inductive element in the distributed transformer, and a second output (outm) of the differential outputs of each SCPA (400; 610) is coupled to a first terminal of a different adjacent inductive element in the distributed transformer; wherein, within each SCPA (400; 610), each capacitor of the first plurality of capacitors (C sp <1>,..., C sp <N>) comprises a second terminal coupled to a first terminal of the first inductor; wherein, within each SCPA (400; 610), each capacitor of the second plurality of capacitors (C sm <1>,..., C sm <N>) comprises a second terminal coupled to a first terminal of the second inductor; and wherein a second terminal of the first inductor (450, Lsp) is connected to the first output (outp) of the differential outputs and a second terminal of the second inductor (451, Lsm) is connected to the second output (outm) of the differential outputs.