Systems and methods of RF power transmission, modulation, and amplification, including embodiments for error correction
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 for error correction, the method comprising:
receiving, with a receiver, a radio frequency (RF) output signal from a multiple input single output (MISO) device;
scaling an amplitude of the RF output signal to generate a scaled analog signal;
sampling the scaled analog signal to generate a sampled representation of the scaled analog signal;
converting the sampled representation of the scaled analog signal to a digital signal;
calculating a delay between one or more input signals to the MISO device and the RF output signal from the MISO device based on the digital signal; and
adjusting one or more operational parameters of the MISO device based on the delay.
2. The method of claim 1 , further comprising:
filtering the sampled representation of the scaled analog signal prior to converting the sampled representation of the scaled analog signal to the digital signal.
3. The method of claim 1 , wherein the receiving comprises adjusting one or more operational parameters of the MISO device based on a desired gain for the receiver.
4. The method of claim 1 , wherein the scaling comprises scaling the amplitude of the RF output signal from the MISO device to a dynamic range of an analog-to-digital converter.
5. The method of claim 1 , wherein the sampling comprises sampling I and Q data components of the RF output signal from the MISO device.
6. The method of claim 1 , wherein the adjusting comprises adjusting at least one of a gain balance control, an output stage autobias, a driver stage autobias, or a combination thereof of the MISO device.
7. A system for error correction, the system comprising:
a receiver configured to receive a radio frequency (RF) output signal from a multiple input single output (MISO) device;
an automatic gain controller (AGC) configured to scale the RF output signal to generate a scaled analog signal;
a sample-and-hold (S/H) circuit configured to sample the scaled analog signal to generate a sampled representation of the scaled analog signal;
an analog-to-digital converter (ADC) configured to convert the sampled representation of the scaled analog signal from the S/H circuit to a digital signal; and
a digital control module configured to:
calculate a delay between one or more input signals to the MISO device and the RF output signal from the MISO device based on the digital signal; and
adjust one or more operational parameters of the MISO device based on the delay.
8. The system of claim 7 , further comprising:
an interpolation filter configured to filter the sampled representation of the scaled analog signal from the S/H circuit prior to conversion to the digital signal by the ADC.
9. The method of claim 1 , wherein the adjusting comprises aligning I and Q signal inputs to the MISO device based on sampled I and Q data components of the RF output signal from the MISO device.
10. The method of claim 1 , wherein the adjusting comprises operating the MISO device in one or more classes of operation.
11. The system of claim 7 , wherein the digital control module is configured to adjust the one or more operational parameters of the MISO device based on a desired gain for the receiver.
12. The system of claim 7 , wherein the AGC is configured to scale the amplitude of the RF output signal from the MISO device to a dynamic range of the ADC.
13. The system of claim 7 , wherein the RF output signal from the MISO device varies based on a class of operation of the MISO device.
14. The system of claim 7 , wherein the RF output signal from the MISO device comprises I and Q data components, and wherein the S/H circuit is configured to sample I and Q data components of the RF output signal from the MISO device.
15. The system of claim 7 , wherein the one or more operational parameters of the MISO device comprise at least one of a gain balance control, an output stage autobias, a driver stage autobias, or a combination thereof.
16. The system of claim 7 , wherein at least one of the MISO device, AGC, S/H circuit, or a combination thereof is operable within a predetermined band of frequencies.
17. The method of claim 1 , wherein the receiving comprises coupling the receiver to an output of the MISO device.
18. The system of claim 7 , wherein the receiver is coupled to an output of the MISO device.