Radio frequency transmitter and methods thereof

A method comprising:

• generating signals having a common carrier frequency and having relative phase differences, said relative phase differences determined from an instantaneous amplitude of an input signal and from a predetermined power level;
• varying amplitudes of signals derived from said generated signals according to a targeted power level, said targeted power level selected from at least two power levels;
• and
• combining said amplitude-varied signals into an output signal having an average power that is substantially equivalent to said targeted power level.

A method comprising:

• when a targeted power level is below a predetermined power level:
• generating baseband signals having relative phase differences, said relative phase differences determined from said predetermined power level, the amplitude of said baseband signals being determined, at least in part, from said targeted power level;
• and
• combining signals derived from said baseband signals into an output signal having an average power that is substantially equivalent to said targeted power level, said derived signals having a common carrier frequency.

A method comprising:

• generating baseband signals having relative phase differences, said relative phase differences determined from a predetermined average output signal power level;
• varying amplitudes of signals derived from said baseband signals according to a targeted power level, said targeted power level selected from at least two power levels, said derived signals having a common carrier frequency;
• and
• combining said amplitude-varied signals into an output signal having an average power that is substantially equivalent to said targeted power level.

A method comprising:

• generating baseband signals having relative phase differences;
• and
• combining signals derived from said baseband signals into an output signal having an average power that is substantially equivalent to a targeted power level, said derived signals having a common carrier frequency,
• wherein if said targeted power level is in a first range of average output signal power levels, said relative phase differences are determined from said targeted power level, and
• wherein if said targeted power level is in a second range of average output signal power levels, said relative phase differences are determined from a predetermined power level and the method further comprises varying amplitudes of said signals derived from said baseband signals prior to combining said signals derived from said baseband signals.

A transmitter comprising:

• a processor adapted to receive a power level, said processor further adapted to generate signals having a common carrier frequency and having relative phase differences, said relative phase differences determined from said received power level and from an instantaneous amplitude of a baseband input signal;
• a controller to provide said processor with said received power level, said received power level related to a predetermined power level when a targeted power level is in a first range of average output signal power levels, and said received power level related to said targeted power level when said targeted power level is in a second range of average output signal power levels;
• and
• a power amplifier adapted to combine signals derived from said generated signals into an output signal having an average power that is substantially equivalent to said targeted power level, wherein said output signal is compatible for use in a cellular communications system.

A transmitter comprising:

• a processor adapted to receive a power level, said processor further adapted to generate baseband signals having relative phase differences, said relative phase differences determined from said received power level;
• a controller to provide said processor with said received power level, said received power level related to a predetermined power level when a targeted power level is in a first range of average output signal power levels, and said received power level related to said targeted power level when said targeted power level is in a second range of average output signal power levels;
• and
• a power amplifier adapted to combine signals having a common carrier frequency derived from said baseband signals into an output signal having an average power that is substantially equivalent to said targeted power level, wherein said output signal is compatible for use in a cellular communications system.