Communications devices with envelope extraction and related methods

A communications device comprising:

• an encoder configured to generate digital baseband In-phase (I) and Quadrature (Q) signals;
• a processor coupled to said encoder and configured to
• when a bandwidth of the digital baseband I and Q signals is less than a threshold value, extract at least one envelope characteristic from the digital baseband I and Q signals to generate near constant envelope I and Q signals, and
• when the bandwidth of the digital baseband I and Q signals is greater than the threshold value, extract the at least one envelope characteristic from a part of a spectrum of the digital baseband I and Q signals, the part of the spectrum being below a frequency threshold;
• a power amplifier coupled downstream from said processor and configured to generate an amplified I and Q signal based upon the at least one envelope characteristic;
• I and Q circuits coupled between said processor and said power amplifier;
• and
• an antenna coupled to said power amplifier.

A method of operating a communications device comprising:

• using an encoder to generate digital baseband In-phase (I) and Quadrature (Q) signals;
• using a processor coupled to the encoder to
• when a bandwidth of the digital baseband I and Q signals is less than a threshold value, extract at least one envelope characteristic from the digital baseband I and Q signals to generate near constant envelope I and Q signals, and
• when the bandwidth of the digital baseband I and Q signals is greater than the threshold value, extract the at least one envelope characteristic from a part of a spectrum of the digital baseband I and Q signals, the part of the spectrum being below a frequency threshold;
• and
• using a power amplifier coupled downstream from the processor to generate an amplified I and Q signal based upon the at least one envelope characteristic.

A mobile wireless cellular communications device comprising:

• an encoder configured to generate digital baseband In-phase (I) and Quadrature (Q) signals;
• a processor coupled to said encoder and configured to
• when a bandwidth of the digital baseband I and Q signals is less than a threshold value, extract at least one envelope characteristic from the digital baseband I and Q signals to generate near constant envelope I and Q signals, and
• when the bandwidth of the digital baseband I and Q signals is greater than the threshold value, extract the at least one envelope characteristic from at least a part of a spectrum of the digital baseband I and Q signals, the part of the spectrum being below a frequency threshold;
• and
• a power amplifier coupled downstream from said processor and configured to generate an amplified I and Q signal based upon the at least one envelope characteristic.

A method of operating a mobile wireless cellular communications device comprising:

• using an encoder to generate digital baseband In-phase (I) and Quadrature (Q) signals;
• using a processor coupled to the encoder to
• when a bandwidth of the digital baseband I and Q signals is less than a threshold value, extract at least one envelope characteristic from the digital baseband I and Q signals to generate near constant envelope I and Q signals, and
• when the bandwidth of the digital baseband I and Q signals is greater than the threshold value, extract the at least one envelope characteristic from at least a part of a spectrum of digital baseband I and Q signals, the part of the spectrum being below a frequency threshold;
• and
• using a power amplifier coupled downstream from the processor to generate an amplified I and Q signal based upon the at least one envelope characteristic.