Multi-mode power amplifier

A power amplifier, comprising:

• an input network;
• output stages coupled in parallel and configured for outputting power optimally in corresponding ranges, the output stages coupled to the input network;
• an output impedance matching network, coupled to the output stages;
• and
• a bias-control network, coupled between the output impedance matching network, the input network, and the output stages, wherein:
• the output impedance matching network does not contain a switching element corresponding to the output stage configured to output power in the highest range.

A power amplifier, comprising:

• an input network;
• output stages, coupled in parallel and configured to output power optimally in corresponding power-ranges, the output stages coupled to the input network;
• an output impedance matching network, coupled to the output stages;
• and
• a bias-control network, coupled between the output impedance matching network, the input network, and the output stages, wherein:
• the bias-control network is configured to isolate output stages by providing a hard shut-off to transistors of the isolated output stages.