Power amplifying apparatus with wideband linearity

A power amplifying apparatus comprising:

• a drive bias circuit configured to generate a drive bias current;
• a drive amplification circuit configured to receive the driving bias current, amplify an input signal which has a first frequency component and a second frequency component, and output an amplified signal;
• a first bias circuit configured to generate a first bias current;
• a first amplification circuit configured to receive the first bias current, amplify a signal input to the first amplification circuit through a first node of the drive amplification circuit, and output a first amplified signal to a second node;
• a second bias circuit, configured to generate a second bias current which has a magnitude different from a magnitude of the first bias current;
• and
• a second amplification circuit, connected in parallel with the first amplification circuit, configured to receive the second bias current, amplify the signal input through the first node, and output a second amplified signal to the second node.

A power amplifying apparatus comprising:

• a first amplifier configured to generate a first amplified signal based on a received first bias current and an input signal comprising one or more frequency components;
• a variable bias circuit configured to generate a second bias current;
• and
• a second amplifier connected in parallel with the first amplifier, and configured to generate a second amplified signal based on a received second bias current from the variable bias circuit, and the input signal,
• wherein the second amplified signal has a third-harmonic component having a phase that offsets from a third-order intermodulation distortion (IM3) component in the first amplified signal.