Patent ID: 8810312
Filing Date: 2014-08-19
Classification: H03F

Abstract:
1. An apparatus for use in a power amplifier, comprising: a power divider configured to provide a power signal to a carrier amplifier and a peaking amplifier; the carrier amplifier configured to amplify a power of the signal input from the power divider; the peaking amplifier configured to have a maximum output power magnitude different from the carrier amplifier and amplify the power of the signal input from the power divider; at least two offset transmission lines disposed at ends of the carrier amplifier and the peaking amplifier and configured to regulate a load impedance; and an output combiner configured to combine outputs of the carrier amplifier and the peaking amplifier of different sizes, and to output the combined output, wherein a size ratio of the peaking amplifier and the carrier amplifier is determined by considering a backoff level having a maximum average efficiency for a Peak to Average Power Ratio (PAPR) of a modulation signal and an on-resistance of the carrier amplifier.