Varying amplifier bias parameters to meet radio frequency (RF) communications requirements

Amplifier bias circuitry comprising:

• control circuitry adapted to select one of a first operating mode and a second operating mode;
• a first output having an output impedance and adapted to provide an amplifier bias output signal to a radio frequency (RF) amplifier;
• an RF amplifier bias circuit coupled to the first output and adapted to:
• provide the amplifier bias output signal via the first output;
• and
• present a first impedance to the first output, such that during the first operating mode the first impedance has a first value and during the second operating mode the first impedance has a second value;
• and
• an impedance compensation circuit coupled to the first output and adapted to present a second impedance to the first output, such that during the first operating mode the second impedance has a third value and during the second operating mode the second impedance has a fourth value,
• wherein the first impedance and the second impedance combine to provide the output impedance.