High efficiency multiple power mode linear radio frequency power amplifier

摘要

The embodiments disclosed in the detailed description include a power amplifier having a low power mode amplifier, a medium power mode amplifier, and a high power mode amplifier in communication with a radio frequency (RF) output load. The exemplary embodiments of the power amplifier permit a wireless device to select the most power efficient means to transmit an RF signal based upon the desired output power level.

主权项

1. A power amplifier device comprising:
a power amplifier operable to be enabled and disabled; an output matching network coupled between the power amplifier and a radio frequency output node such that the power amplifier presents an output impedance to the output matching network and the radio frequency output node presents a load impedance to the output matching network, the output matching network being configured to be switched between transforming the output impedance to a first impedance and transforming the output impedance to a second impedance, wherein the first impedance substantially matches the load impedance and the second impedance is higher than the load impedance; a controller configured to enable the power amplifier and to switch the output matching network into transforming the output impedance to the first impedance in response to a command to enable the power amplifier.