Multi-mode power amplifier

摘要

A multi-mode power amplifier includes a high-power mode amplifier circuit, a mid-power mode amplifier circuit, and a low power amplifier circuit, where the low-power mode amplifier circuit comprises a plurality of independently selectable power cell/amplifier branches. The multi-mode power amplifiers selectively enable or disable amplifier branches to provide multiple levels of amplification. Selectively enabling certain of a plurality of split collector amplifier branches provides multiple low power and ultra-low power amplifier modes without the impedance mismatch or board layout problems associated with an RF switch.

主权项

1. A multi-mode power amplifier comprising:
a high-power mode amplifier circuit including a high-power mode control signal which enables the high-power mode amplifier circuit; a mid-power mode amplifier circuit including a mid-power mode control signal which enables the mid-power mode amplifier circuit, the mid-power mode control signal distinct from the high-power mode control signal; and a low-power mode amplifier circuit including a plurality of selectable amplifier branches, each amplifier branch including a corresponding low-power mode control signal, each of the low-power mode control signals independent from the high and mid-power mode control signals such that selecting certain of the power modes reduces the power consumption of the multi-mode power amplifier.