Apparatus and Method for a Digital Transmitter Architecture with Outphasing Power Amplifier

摘要

System and method embodiments are provided for improving power efficiency in an outphasing amplifier with a non-isolating combiner. Some embodiments include a circuit comprising a signal decomposer configured to receive an input signal, a non-isolating combiner coupled to the signal decomposer and configured to provide an amplified output signal corresponding to the input signal, a first power amplifiers (PA) on a first branch between the signal decomposer and the non-isolating combiner, a second PA on a second branch between the signal decomposer and the non-isolating combiner, and a switch on the second branch between the signal decomposer and the second PA. The switch is configured to disconnect the second PA from the signal decomposer upon determining that the input signal is in a first condition, and further configured to connect the second PA to the signal decomposer upon determining otherwise.