Circuits and methods for reducing supply sensitivity in a power amplifier

A method comprising:

• receiving an input signal in a first power amplifier stage, and in accordance therewith, producing an output signal on an output node, the first power amplifier stage receiving a time-varying power supply voltage;
• and
• receiving the input signal in a second power amplifier stage configured in parallel with the first power amplifier stage, and in accordance therewith, producing the output signal on the output node, the second power amplifier stage receiving the time-varying power supply voltage,
• wherein a first gain of the first power amplifier stage decreases when the power supply voltage is in a first low voltage range, and wherein a second gain of the second power amplifier stage compensates for the decreasing gain of the first power amplifier stage in the first low voltage range.

A circuit comprising:

• first power amplifier means having an input to receive an input signal, an output coupled to an output node, the first power amplifier stage receiving a time-varying power supply voltage;
• and
• second power amplifier means configured in parallel with the first power amplifier means having an input to receive the input signal, an output coupled to the output node, the second power amplifier stage receiving the time-varying power supply voltage,
• wherein a first gain of the first power amplifier means decreases when the power supply voltage is in a first low voltage range, and wherein a second gain of the second power amplifier means compensates for the decreasing gain of the first power amplifier means in the first low voltage range.