Radio frequency composite Class-S power amplifier having discrete power control

摘要

A composite amplifier providing digitally selectable amplification includes a plurality of channels and a combiner. Each of the channels includes a digitally controllable selector, a Class-S power amplifier, and bandpass filter. The digitally controllable selector selectively couples a digital bitstream to the amplifier. The amplifier receives the digital bitstream and provides an amplified signal. The bandpass filter generates a filtered signal as a function of the amplified signal. The combiner couples filtered signals provided by the channels to form a composite output signal. A method of providing digitally selectable amplification includes steps of: selectively coupling a digital bitstream to a plurality of channels in the amplifier; amplifying the digital bitstream to provide an amplified signal associated with a corresponding one of the channels; filtering amplified signals associated with the channels to provide corresponding filtered signals; and combining the filtered signals to generate a composite output signal.

主权项

1. A composite amplifier that provides digitally selectable amplification, the composite amplifier comprising:
a plurality of channels, each of the plurality of channels comprising:
a digitally controllable selector;a Class-S power amplifier, the digitally controllable selector being operative to selectively couple a digital bitstream to the Class-S power amplifier, the Class-S power amplifier being operative to amplify the digital bitstream, thereby providing an amplified signal; anda bandpass filter coupled with the Class-S power amplifier, the bandpass filter being operative to filter the amplified signal, thereby providing a filtered signal; and a combiner operative to couple filtered signals associated with the plurality of channels and to generate a composite output signal as a function of the filtered signals.