Dual rail out-phased envelope tracking modulator
AssigneeAuriga Measurement Systems, LLC
InventorSteven A. Mulawski
Life of this patent
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Abstract
A drain modulator circuit for operation with a radio frequency (RF) amplifier, includes a pair of AC signal sources each of the AC signal sources having an output at which an AC signal is provided. The drain modulator circuit further includes a pair of tapped delay elements, each of which is configured to receive an AC signal from a respective one of the AC signal sources and a control element coupled to provide one or more control signals to the pair of tapped delay elements such that the tapped delay elements provide a selected instantaneous differential voltage to the RF amplifier.
Claims19
A drain modulator circuit for operation with a radio frequency (RF) amplifier having a pair of bias terminals, the modulator comprising:
- a pair of AC signal sources, each of said pair of AC signal sources having an output at which an AC signal is provided;
- a pair of variable delay elements, each of said variable delay elements configured to receive an AC signal from a respective one of said pair of AC signal sources;
- and
- a control element coupled to provide one or more control signals to said pair of variable delay elements, wherein in response to the one or more control signals from said control element, said variable delay elements introduce a relative shift between the AC signals provided by said pair of AC signal sources such that a differential voltage is provided across the bias terminals of the RF amplifier.
Dependencies are inferred from the claim text.