POWER AMPLIFIERS WITH TUNABLE LOADLINE MATCHING NETWORKS

1 . A power amplifier comprising:

at least a first power amplifier stage coupled with a power supply, said first power amplifier stage configured to adjust a first output power of said first power amplifier stage based on a power supply voltage of said power supply; and

at least a first tunable loadline matching network, said first tunable loadline matching network configured to adjust a loadline value of the power amplifier, said first tunable loadline matching network including at least a first set of metal oxide semiconductor variable capacitor arrays.

2 . The power amplifier of claim 1 , further comprising a second power amplifier stage.

3 . The power amplifier of claim 1 , wherein said first tunable loadline matching network is configured to adjust said loadline value of the power amplifier based on said power supply voltage.

4 . The power amplifier of claim 2 , wherein said first tunable loadline matching network is coupled with an output of said second power amplifier stage.

5 . The power amplifier of claim 2 , wherein said first tunable loadline matching network is coupled between said first power amplifier stage and said second power amplifier stage.

6 . The power amplifier of claim 5 , further comprising at least a second tunable loadline matching network.

7 . The power amplifier of claim 6 , wherein said second tunable matching network is coupled with an output of said second power amplifier stage.

8 . The power amplifier of claim 1 , wherein said power supply voltage is generated by a battery.

9 . The power amplifier of claim 1 further comprising:

at least a second power amplifier stage coupled with said power supply, said second power amplifier stage configured to adjust a second output power of said second power amplifier based on said power supply voltage;

and

at least a second tunable loadline matching network coupled with a second power amplifier stage output of said second power amplifier stage, said second tunable loadline matching network configured to adjust a loadline value of the second power amplifier, said second tunable loadline matching network including at least a second set of metal oxide semiconductor variable capacitor arrays.

10 . The power amplifier of claim 1 , wherein said at least one first set of metal oxide semiconductor variable capacitor arrays includes at least three variable capacitor cells electrically connected in parallel.

11 . The power amplifier of claim 10 , wherein each of said at least three variable capacitor cells includes two or more pairs of anti-series metal oxide semiconductor capacitors.

12 . A radio-frequency system comprising:

a plurality of power amplifier stages, each of the plurality of power amplifier stages coupled with a power supply, at least a first power amplifier stage of said plurality of power amplifier stages configured to adjust a first output power of said first power amplifier based on said power supply voltage; and

at least a first tunable loadline matching network, said tunable loadline matching network configured to adjust the loadline value of the radio frequency system.

13 . The radio frequency system of claim 12 , wherein said first tunable loadline matching network is configured to adjust said loadline value based on said power supply voltage.

14 . The radio frequency system of claim 12 , further comprising a second power amplifier stage of said plurality of power amplifier stages.

15 . The radio frequency system of claim 14 , wherein said first tunable loadline matching network is coupled with a second output of said second power amplifier stage.

16 . The radio frequency system of claim 14 , wherein said first tunable loadline matching network is coupled between said first power amplifier stage and said second power amplifier stage.

17 . The radio frequency system of claim 12 , wherein said first tunable loadline matching network includes at least one first set of metal oxide semiconductor variable capacitor arrays.

18 . The radio frequency system of claim 17 , wherein said at least one first set of metal oxide semiconductor variable capacitor arrays includes at least three variable capacitor cells electrically connected in parallel.

19 . The radio frequency system of claim 18 , wherein each of said at least three variable capacitor cells includes two or more pairs of anti-series metal oxide semiconductor capacitors.

20 . A radio-frequency system comprising:

a means for amplifying a radio-frequency signal and adjusting an output power based on a power supply voltage, said means for amplifying said radio-frequency signal and adjusting said output power based on said power supply voltage coupled with a power supply; and

a means for adjusting a loadline value coupled with said means for amplifying said radio-frequency signal and adjusting said output power.