Patent ID: 10404225

Abstract:
In one aspect the embodiments relate to amplifier circuitry comprising an outphasing region and envelope tracking region. The outphasing region includes a signal processing block capable of receiving an amplitude and phase modulated input signal that is to be amplified, and processing said signal to separate it into two signals (S1, S2) of constant amplitude and modulated phase, a first signal S1 for driving a first RF power amplifier RF PA1 and a second signal S2 for driving a second RF power amplifier RF PA2. The output signals from each of the RF PAs are then provided to a power combiner (PC) for obtaining an output amplified signal (RF output). The envelope tracking region (100b) includes a linear amplifier (Env Amp) capable of receiving an input representing an envelope of the input signal that to be amplified, a charge storage device C1 coupled to said amplifier for providing an amplified envelope signal for driving the RF PAs, said amplifier (8) and charge storage device C1 being arranged to receive a supply voltage V+. The amplifier circuitry is configured such that when the first signal S1 and the second signal S2 in the outphasing circuit 100a are in phase, an input voltage V1 based on the voltage of the received envelope signal is provided to the amplifier in the envelope tracking region to enable the charge storage device C1 to supply a voltage V2 above the supply voltage V+ such that the output voltage of the RF PAs driven by the amplifier (8) is increased by V2 above the supply voltage V+.