RF power transmission, modulation, and amplification, including power control of multiple input single output (MISO) amplifiers
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.
1. A method of power amplification, comprising:
receiving a frequency reference signal;
receiving information having a plurality of components;
determining one or more phase shift angles between said plurality of components based upon magnitudes of said plurality of components;
generating a plurality of control signals using said one or more phase shift angles;
generating a plurality of substantially constant envelope signals using said frequency reference signal and said control signals;
amplifying and combining said substantially constant envelope signals to create a desired output signal; and
controlling power of said desired output signal by controlling said one or more phase shift angles between said plurality of components.
2. The method of claim 1 , wherein said controlling power comprises:
controlling a magnitude of said desired output signal by substantially equally shifting symmetrically said plurality of components.
3. The method of claim 1 , wherein said controlling power comprises:
controlling output power by constraining said phase shift angles between said plurality of components.
4. The method of claim 3 , wherein said controlling output power comprises:
achieving a maximum output power by imposing a minimum phase shift angle condition on said plurality of components.
5. The method of claim 3 , wherein said controlling output power comprises:
achieving a minimum output power by imposing a maximum phase shift angle condition on said plurality of components.
6. The method of claim 1 , wherein said controlling power comprises:
controlling output power resolution as a function of a power increment and decrement step size.
7. The method of claim 6 , wherein said controlling output power resolution comprises:
defining a minimum phase shift angle step size.
8. The method of claim 1 , wherein said determining one or more phase shift angles comprises:
determining said magnitudes of said plurality of components; and
performing a magnitude to phase shift transformation on said magnitudes to determine said one or more phase shift angles.
9. The method of claim 8 , wherein said generating said plurality of control signals comprises:
calculating amplitudes for said plurality of control signals based upon said one or more phase shift angles such that said desired output signal is an amplified representation of said information.
10. The method of claim 1 , wherein said controlling power comprises:
adjusting said one or more phase shift angles between said plurality of components to control said one or more phase shift angles between said plurality of components.
11. An apparatus for power amplification, comprising:
circuitry operable to receive a frequency reference signal;
circuitry operable to receive information having a plurality of components;
circuitry operable to determine one or more phase shift angles between said plurality of components based upon magnitudes of the plurality of components;
circuitry operable to generate a plurality of control signals using said one or more phase shift angles; and
circuitry operable to generate a plurality of substantially constant envelope signals using said frequency reference signal and said control signals;
circuitry operable to amplify and to combine said substantially constant envelope signals to create a desired output signal,
wherein power of said desired output signal is controlled by controlling said one or more phase shift angles between said plurality of components.
12. The apparatus of claim 11 , wherein said desired output signal is controlled by controlling a magnitude of said desired output signal by substantially equally shifting symmetrically said plurality of components.
13. The apparatus of claim 11 , wherein said desired output signal is controlled by constraining said phase shift angles between said plurality of components.
14. The apparatus of claim 13 , wherein said desired output signal achieves a maximum output power by imposing a minimum phase shift angle condition on said plurality of components.
15. The apparatus of claim 13 , wherein said desired output signal achieves a minimum output power by imposing a maximum phase shift angle condition on said plurality of components.
16. The apparatus of claim 11 , wherein said desired output signal is controlled by controlling output power resolution as a function of a power increment and decrement step size.
17. The apparatus of claim 16 , wherein said output power resolution defines a minimum phase shift angle step size.
18. The apparatus of claim 11 , wherein said circuitry operable to determine one or more phase shift angles comprises:
circuitry operable to determine said magnitudes of said plurality of components; and
circuitry operable to perform a magnitude to phase shift transformation on said magnitudes to determine said one or more phase shift angles.
19. The apparatus of claim 18 , wherein said circuitry operable to generate said plurality of control signals comprises:
circuitry operable to calculate amplitudes for said plurality of control signals based upon said one or more phase shift angles such that said desired output signal is an amplified representation of said information.
20. The apparatus of claim 11 , wherein said one or more phase shift angles between said plurality of components are controlled by adjusting said one or more phase shift angles between said plurality of components.
21. A system for power amplification, comprising:
a module configured to receive a frequency reference signal;
a module configured to receive information having a plurality of components;
a module configured to determine one or more phase shift angles between said plurality of components based upon magnitudes of the plurality of components;
a module configured to generate a plurality of control signals using said one or more phase shift angles; and
a module configured to generate a plurality of substantially constant envelope signals using said frequency reference signal and said control signals;
an amplifier operable to amplify and to combine said substantially constant envelope signals to create a desired output signal,
wherein power of said desired output signal is controlled by controlling said one or more phase shift angles between said plurality of components.
22. The system of claim 21 , wherein said desired output signal is controlled by controlling a magnitude of said desired output signal by substantially equally shifting symmetrically said plurality of components.
23. The system of claim 21 , wherein said desired output signal is controlled by constraining said phase shift angles between said plurality of control signals.
24. The system of claim 23 , wherein said desired output signal achieves a maximum output power by imposing a minimum phase shift angle condition on said plurality of control signals.
25. The system of claim 23 , wherein said desired output signal achieves a minimum output power by imposing a maximum phase shift angle condition on said plurality of control signals.
26. The system of claim 21 , wherein said desired output signal is controlled by controlling output power resolution as a function of a power increment and decrement step size.
27. The system of claim 26 , wherein said output power resolution defines a minimum phase shift angle step size.
28. The system of claim 21 , wherein said module configured to determine one or more phase shift angles comprises:
a module configured to determine said magnitudes of said plurality of components; and
a module configured to perform a magnitude to phase shift transformation on said magnitudes to determine said one or more phase shift angles.
29. The apparatus of claim 28 , wherein said module configured to generate said plurality of control signals comprises:
a module configured to calculate amplitudes for said plurality of control signals based upon said one or more phase shift angles such that said desired output signal is an amplified representation of said information.
30. The system of claim 21 , wherein said one or, more phase shift angles between said plurality of components are controlled by adjusting said one or more phase shift angles between said plurality of components.