Systems and methods of RF tower transmission, modulation, and amplification, including embodiments for compensating for waveform distortion
First Claim
1. A method of at least one of power transmission, modulation, and amplification including output waveform distortion compensation, comprising:
- receiving a frequency reference signal;
receiving an input signal;
generating a plurality of control signals from said received input signal;
generating a plurality of constant envelope signals using said frequency reference signal and said control signals;
amplifying and combining said constant envelope signals to create an output signal; and
reducing phase and amplitude errors in said output signal relative to a desired output signal, wherein said reducing phase and amplitude errors comprises at least one of;
adjusting a transfer function used to generate said plurality of control signals from said received input signal, wherein said transfer function transforms said received input signal into said plurality of control signals; and
adjusting offset voltages provided to vector modulation circuitry used to generate said plurality of constant envelope 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.
672 Citations
38 Claims
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1. A method of at least one of power transmission, modulation, and amplification including output waveform distortion compensation, comprising:
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receiving a frequency reference signal; receiving an input signal; generating a plurality of control signals from said received input signal; generating a plurality of constant envelope signals using said frequency reference signal and said control signals; amplifying and combining said constant envelope signals to create an output signal; and reducing phase and amplitude errors in said output signal relative to a desired output signal, wherein said reducing phase and amplitude errors comprises at least one of; adjusting a transfer function used to generate said plurality of control signals from said received input signal, wherein said transfer function transforms said received input signal into said plurality of control signals; and adjusting offset voltages provided to vector modulation circuitry used to generate said plurality of constant envelope signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for power transmission, modulation, and amplification, comprising:
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input circuitry that receives an input signal, and that generates a plurality of control signals from said received input signal; vector modulation circuitry, coupled to said input circuitry, that receives said control signals and a frequency reference signal, and that generates a plurality of constant envelope signals using said frequency reference signal and said control signals; a power amplifier that receives said constant envelope signals and amplifies and combines said constant envelope signals to create an output signal; and means for reducing phase and amplitude errors in said output signal relative to a desired output signal, wherein said means for reducing phase and amplitude errors comprises at least one of; means for adjusting a transfer function of a digital control module of said input circuitry; and means for adjusting offset voltages provided to said vector modulation circuitry. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification