Patent ID: 7457595

Claim:
A transmitter comprising: a power amplifier having a power supply input and an output for supplying a transmission signal with an output power, a power supply having power supply outputs for supplying a first power supply voltage having a first level and a second power supply voltage having a second level being higher than the first level, a switching circuit arranged between the power supply outputs and the power-supply input, and a controller for supplying, in response to a first power change command indicating a first desired level of the output power, a control signal to the switching circuit to supply the first power supply voltage to the power supply input, and for supplying, in response to a second power change command indicating a second desired level of the output power and succeeding the first power change command, the control signal to the switching circuit to supply either the first power supply voltage or the second power supply voltage to the amplifier power supply input depending on values of said first desired level and said second desired level; wherein the transmitter is arranged for operation in a transmission system based on time slots, and wherein the first power change command indicates a value of the output power required during a time slot starting after an instant of occurrence of the first power change command, and wherein the second power change command indicates a value of the output power required during a next time slot succeeding the first mentioned time slot and starting after an instant of occurrence of the second power change command.