MULTI MODE BYPASS DRIVER AMPLIFIER WITH TUNABLE LOAD MATCHING

摘要

A multi mode driver amplifier with tunable load matching is disclosed. In an exemplary design an apparatus includes a multi mode driver amplifier and a tunable impedance matching circuit. The driver amplifier amplifies an input radio frequency RF signal and provides an amplified RF signal. The tunable impedance matching circuit matches an output impedance of the driver amplifier. The apparatus may include a main transmit path (510) and a bypass transmit path (512). The bypass transmit path (512) may include the driver amplifier (542) and the tunable impedance matching circuit (552) and no power amplifier. The main transmit path (510) may include a second driver amplifier (540) and a power amplifier (560). The main transmit path (510) may be selected for transmit power levels higher than a threshold level and the bypass transmit path (512) may be selected for transmit power levels lower than the threshold level.