Device and method for a wireless transmitter

A wireless transmitter comprising:

• a first voltage supply configured to supply a first voltage to a driver during a non-modulated state;
• a second voltage supply configured to supply a second voltage configurable by a modulation index value to the driver during a modulated state;
• the driver, configured to controlling a signal envelope shape of a modulation pulse;
• a control circuit configured to switch the driver between the non-modulated state and the modulated state, by setting the modulation index value to configure the second voltage at a same level as the first voltage and then switching between the first voltage supply and the second voltage supply supplying the driver;
• and
• a filtering circuit configured to filter, to a limited bandwidth, variations of the second voltage resulting from setting the modulation index value.