Amplifier circuitry for envelope modulators, envelope modulators incorporating said amplifier circuitry and method of modulating a signal envelope

摘要

An amplifier circuitry for an envelope modulator including: a linear amplifier configured to receive an input representing an envelope of a signal to be amplified; a charge storage device coupled to the amplifier for providing an amplified envelope signal for driving a load, the amplifier and charge storage device configured to receive a supply voltage; wherein the amplifier circuitry is configured such that responsive to the voltage of the input envelope signal reaching or exceeding a defined threshold value, an input voltage based on the voltage of the received envelope signal is provided to the amplifier to enable the charge storage device to supply a charge above the supply voltage such that the output voltage of the load driven by the amplifier circuitry is increased above the supply voltage. An envelope modulator incorporates the modulator and a method for amplifying an envelope signal utilizes the modulator.