Radio apparatus

An apparatus, comprising:

• a memory to store reference data indicative of characteristics for each of two or more amplifiers for amplifying signals in two or more respective bands, the reference data including voltage characteristics required by a particular amplifier to achieve a particular output power for a range of output power values for its respective frequency band while meeting one or more predetermined performance requirements, wherein stored voltage characteristics comprise a drain voltage and a gate bias voltage required for the particular amplifier to achieve the particular output power for its respective radio frequency band;
• and
• a receiver to receive at least a first required output power for a first amplifier and a second required output power for a second amplifier,
• wherein the apparatus is configured to determine, based on the reference data, the voltage characteristics required for the first amplifier to achieve the first required output power and the voltage characteristics required for the second amplifier to achieve the second required output power, and
• wherein the one or more predetermined performance requirements comprise one or more of maintain group delay variation and an out-of-band rejection.