Systems and methods of RF power transmission, modulation, and amplification, including output stage protection circuitry
First Claim
1. An apparatus comprising:
- a first module configured to generate a plurality of in-phase (I) and quadrature (Q) control signals;
a second module configured to generate a plurality of substantially constant envelope signals using said plurality of I and Q control signals and a frequency reference signal;
a power amplifier configured to amplify and combine said plurality of substantially constant envelope signals to create an output signal; and
an output stage protection module configured to control an output of said power amplifier to be below a threshold, wherein said output stage protection module comprises circuitry configured to control a bias of an input stage of said power amplifier based on said plurality of I and Q control signals.
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Accused Products
Abstract
Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.
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Citations
21 Claims
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1. An apparatus comprising:
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a first module configured to generate a plurality of in-phase (I) and quadrature (Q) control signals; a second module configured to generate a plurality of substantially constant envelope signals using said plurality of I and Q control signals and a frequency reference signal; a power amplifier configured to amplify and combine said plurality of substantially constant envelope signals to create an output signal; and an output stage protection module configured to control an output of said power amplifier to be below a threshold, wherein said output stage protection module comprises circuitry configured to control a bias of an input stage of said power amplifier based on said plurality of I and Q control signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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generating a plurality of in-phase (I) and quadtrature (Q) control signals; generating a plurality of substantially constant envelope signals using said plurality of I and Q control signals and a frequency reference signal; amplifying and combining said plurality of substantially constant envelope signals using a power amplifier to create an output signal; and controlling an output of said power amplifier to be below a threshold, wherein said controlling comprises controlling a bias of an input stage of said power amplifier based on said plurality of I and Q controls signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification