RF power transmission, modulation, and amplification using multiple input single output (MISO) amplifiers to process phase angle and magnitude information
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 amplifying and frequency up-converting baseband signals, comprising:
1) normalizing in-phase and quadrature baseband signals to determine a relative phase angle;
2) determining magnitude information of said in-phase and quadrature baseband signals;
3) generating two or more substantially constant envelope signals;
4) amplifying the substantially constant envelope signals; and
5) processing the relative phase angle and the determined magnitude information by combining the amplified substantially constant envelope signals to generate an output waveform at a desired output frequency corresponding to a frequency of a received input clock;
wherein steps 4) and 5) are performed using a multiple input single output (MISO) amplifier.
2. The method of claim 1 , wherein combining the amplified substantially constant envelope signals is achieved via direct coupling of output stages.
3. The method of claim 1 , wherein combining the amplified substantially constant envelope signals includes combining first and second substantially constant envelope signals to form an in-phase component of said output waveform, and combining third and fourth substantially constant envelope signals to form a quadrature component of said output waveform.
4. The method of claim 1 , further comprising biasing said MISO amplifier including controlling one or more of output power efficiency, output linearity, and amplification stage protection.
5. The method of claim 1 , further comprising harmonically shaping said output waveform.
6. The method of claim 5 , wherein harmonically shaping comprises wave-shaping said baseband signals.
7. The method of claim 5 , wherein harmonically shaping comprises wave-shaping said output waveform.
8. The method of claim 1 , further comprising protecting said MISO amplifier.
9. The method of claim 1 , wherein said in-phase and quadrature baseband signals are analog.
10. The method of claim 1 , wherein said in-phase and quadrature baseband signals are digital.
11. A system for amplifying and frequency up-converting baseband signals, comprising:
a module operable to normalize in-phase and quadrature baseband signals to determine a relative phase angle;
a module operable to determine magnitude information of in-phase and quadrature baseband signals;
a module operable to generate two or more substantially constant envelope signals;
a multiple input single output (MISO) amplifier operable to amplify the substantially constant envelope signals, and to process the relative phase angle and the determined magnitude information by combining the amplified substantially constant envelope signals to generate an output waveform at a desired output frequency corresponding to a received input clock frequency.
12. The system of claim 11 , wherein said MISO amplifier comprises circuitry for direct coupling of output stages to thereby combine the amplified substantially constant envelope signals.
13. The system of claim 11 , wherein said MISO amplifier comprises first circuitry to combine first and second substantially constant envelope signals to form an in-phase component of said output waveform, and second circuitry to combine third and fourth substantially constant envelope signals to form a quadrature component of said output waveform.
14. The system of claim 11 , further comprising biasing control circuitry to control one or more of output power efficiency, output linearity, and amplification stage protection to thereby bias said MISO amplifier.
15. The system of claim 11 , further comprising a module operable to harmonically shape said output waveform.
16. The system of claim 15 , wherein said module operable to harmonically shape said output waveform comprises circuitry to wave-shape said baseband signals.
17. The system of claim 15 , wherein said module operable to harmonically shape said output waveform comprises circuitry to wave-shape said output waveform.
18. The system of claim 11 , further comprising a module operable to protect said MISO amplifier.
19. The system of claim 11 , wherein said in-phase and quadrature baseband signals are analog.
20. The system of claim 11 , wherein said in-phase and quadrature baseband signals are digital.