Boost charge-pump with fractional ratio and offset loop for supply modulation

1. A power management system for a linear radio frequency power amplifier comprising:

a charge pump including a first flying capacitor, a second flying capacitor, a plurality of switches operably coupled to form a charge pump parallel amplifier power supply output, wherein the charge pump is configured to selectively generate a selected output voltage level of a plurality of output voltage levels, derived from a first supply voltage, on the charge pump parallel amplifier power supply output of the charge pump based upon a selected charge pump operational mode of a plurality of charge pump operational modes;

a switch mode power supply converter including a plurality of switching operational modes configured to generate a plurality of switching voltage levels on a switching voltage output, wherein the switching voltage output is coupled to a capacitor via a power inductor to form a linear radio frequency power amplifier supply output configured to power the linear radio frequency power amplifier; and

a parallel amplifier including a parallel amplifier output in communication with the linear radio frequency power amplifier supply output and a parallel amplifier supply input in communication with the charge pump parallel amplifier power supply output, wherein at least a portion of the parallel amplifier is configured to be powered from the charge pump parallel amplifier power supply output.

2. The power management system of claim 1 , wherein in at least one of the plurality of charge pump operational modes, the charge pump is further configured to boost the first supply voltage to generate the selected output voltage level such that the selected output voltage level is greater than the first supply voltage.

3. The power management system of claim 1 wherein in at least one of the plurality of charge pump operational modes, the charge pump is further configured to buck the first supply voltage to generate the selected output voltage level such that the selected output voltage level is less than the first supply voltage.

4. The power management system of claim 1 , wherein in at least one of the plurality of charge pump operational modes, the charge pump is further configured to generate the selected output voltage level such that the selected output voltage level is substantially equal to the first supply voltage.

5. The power management system of claim 1 , wherein the plurality of charge pump operational modes includes at least one of a first operational mode and a second operational mode, wherein the charge pump is configured to generate the selected output voltage level such that the selected output voltage level is substantially equal to 4/3× the first supply voltage in the first operational mode, and the charge pump is configured to generate the selected output voltage level such that the selected output voltage level is substantially equal to 4/3× the first supply voltage in the second operational mode.

6. The power management system of claim 5 , wherein the plurality of charge pump operational modes further includes at least one of a third operational mode, a fourth operational mode, a fifth operational mode, and a sixth operational mode, wherein the charge pump is configured to generate the selected output voltage level such that the selected output voltage level is substantially equal to 3/2× the first supply voltage in the third operational mode, the charge pump is configured to generate the selected output voltage level such that the selected output voltage level is substantially equal to 1/2× the first supply voltage in the fourth operational mode, the charge pump is configured to generate the selected output voltage level such that the selected output voltage level is substantially equal to 1/3× the first supply voltage in the fifth operational mode, and the charge pump is configured to generate the selected output voltage level such that the selected output voltage level is substantially equal to 1/4× the first supply voltage in the sixth operational mode.

7. The power management system of claim 1 , wherein the switch mode power supply converter further includes a multi-level charge pump configured to generate at least one of a plurality of charge pump voltage levels derived from the first supply voltage at a charge pump output; and

wherein in at least one of the plurality of switching operational modes of the switch mode power supply converter, the switch mode power supply converter is configured to provide the at least one of a plurality of charge pump voltage levels generated by the multi-level charge pump as a switching voltage level of the plurality of switching voltage levels on the switching voltage output.

8. The power management system of claim 7 , wherein the multi-level charge pump includes a third flying capacitor, a fourth flying capacitor, and a plurality of charge pump switches operably configured to form charge pump output.

9. The power management system of claim 7 , wherein the multi-level charge pump further includes an internal switch operably coupled to one of the first flying capacitor and the second flying capacitor, and wherein the multi-level charge pump is further configured to control the internal switch to generate a multi-level charge pump parallel amplifier power supply output, wherein the multi-level charge pump parallel amplifier power supply output is in communication with the parallel amplifier supply input; and

wherein the parallel amplifier is further configured to be selectively powered by one of the multi-level charge pump parallel amplifier power supply output and the charge pump parallel amplifier power supply output.