Quadrature communications device with I antennas and Q antennas and modulated power supply and related methods

1. A communications device comprising:

an In-phase (I) power amplifier configured to generate an I amplified signal;

a Quadrature (Q) power amplifier configured to generate a Q amplified signal;

a programmable I driver coupled upstream of said I power amplifier;

a programmable Q driver coupled upstream of said Q power amplifier;

an I digital-to-analog converter (DAC) configured to generate an I signal;

a Q DAC configured to generate a Q signal;

an I power supply circuit coupled to said I power amplifier and to said I DAC and configured to cause said I power amplifier to modulate an I carrier signal into the I amplified signal based upon the I signal;

a Q power supply circuit coupled to said Q power amplifier and to said Q DAC and configured to cause said Q power amplifier to modulate a Q carrier signal into the Q amplified signal based upon the Q signal; and

at least one antenna coupled to said I and Q power amplifiers.

2. The communications device of claim 1 further comprising a power combiner coupled between said at least one antenna and said I and Q power amplifiers.

3. The communications device of claim 1 wherein said at least one antenna comprises a plurality thereof, said plurality of antennas comprising:

an I antenna coupled to said I power amplifier; and

a Q antenna coupled to said Q power amplifier.

4. The communications device of claim 3 wherein said I and Q antennas are physically separated.

5. The communications device of claim 1 wherein said I and Q power amplifiers are configured to operate in a saturated mode of operation.

6. The communications device of claim 1 further comprising an I look-up table (LUT) module upstream of said I DAC and configured to supply a linear I signal thereto, and a Q LUT module upstream of said Q DAC configured to supply a linear Q signal.

7. The communications device of claim 1 further comprising a phase locked loop (PLL) configured to generate the I and Q carrier signals.

8. The communications device of claim 7 wherein said PLL is configured to generate the I and Q carrier signals comprising constant envelop I and Q carrier signals.

9. The communications device of claim 8 further comprising at least one of a 90/270-degree phase shifter and a 0/180-degree phase shifter between said PLL and said programmable Q driver.

10. The communications device of claim 1 wherein said I and Q power supply circuits each comprises a respective switched mode power supply circuit.

11. The communications device of claim 3 wherein said I and Q antennas comprise rectangular-shaped strip antennas; and wherein said I and Q rectangular-shaped strip antennas are adjacent to each other.

12. The communications device of claim 1 wherein said I and Q DACs are operable using at least fourth generation cellular wireless signals.

13. A communications device comprising:

an In-phase (I) power amplifier configured to generate an I amplified signal;

a Quadrature (Q) power amplifier configured to generate a Q amplified signal;

a programmable I driver coupled upstream of said I power amplifier;

a programmable Q driver coupled upstream of said Q power amplifier;

an I digital-to-analog converter (DAC) configured to generate an I signal;

a Q DAC configured to generate a Q signal;

a phase locked loop (PLL) configured to generate I and Q carrier signals;

an I power supply circuit coupled to said I power amplifier and to said I DAC and configured to cause said I power amplifier to modulate the I carrier signal into the I amplified signal based upon the I signal;

a Q power supply circuit coupled to said Q power amplifier and to said Q DAC and configured to cause said Q power amplifier to modulate the Q carrier signal into the Q amplified signal based upon the Q signal;

an I antenna coupled to said I power amplifier; and

a Q antenna coupled to said Q power amplifier and being physically separated from said I antenna.

14. The communications device of claim 13 wherein said I and Q power amplifiers are configured to operate in a saturated mode of operation.

15. The communications device of claim 13 further comprising an I look-up table (LUT) module upstream of said I DAC and configured to supply a linear I signal thereto, and a Q LUT module upstream of said Q DAC and configured to supply a linear Q signal thereto.

16. The communications device of claim 13 wherein said PLL is configured to generate the I and Q carrier signals comprising constant envelop I and Q carrier signals.

17. The communications device of claim 13 further comprising a 90/270-degree phase shifter between said PLL and said programmable Q driver.

18. A method of operating a communications device comprising:

using an In-phase (I) power amplifier and a programmable I driver coupled upstream of the I power amplifier to generate an I amplified signal;

using a Quadrature (Q) power amplifier and a programmable Q driver coupled upstream of the Q power amplifier to generate a Q amplified signal;

using an I digital-to-analog converter (DAC) to generate an I signal;

using a Q DAC to generate a Q signal;

using an I power supply circuit to cause the I power amplifier to modulate an I carrier signal into the I amplified signal based upon the I signal;

using a Q power supply circuit to cause the Q power amplifier to modulate a Q carrier signal into the Q amplified signal based upon the Q signal; and

using at least one antenna to transmit the I and Q amplified signals.

19. The method of claim 18 further comprising using a power combiner coupled between the at least one antenna and the I and Q power amplifiers to combine the I and Q amplified signals.

20. The method of claim 18 further comprising using an I antenna coupled to the I power amplifier to transmit the amplified I signal; and using a Q antenna coupled to the Q power amplifier to transmit the amplified Q signal.

21. The method of claim 20 further comprising using physically separate I and Q antennas to respectively transmit the I and Q amplified signals.

22. The method of claim 18 further comprising using the I and Q power amplifiers to operate in a saturated mode of operation.

23. The method of claim 18 further comprising using a phase locked loop (PLL) to generate the I and Q carrier signals.

24. The method of claim 23 further comprising using the PLL to generate the I and Q carrier signals comprising constant envelop I and Q carrier signals.

25. The method of claim 18 further comprising using the I and Q DACs to be operable using at least fourth generation cellular wireless signals.