Apparatus, system, and method for digital modulation of power amplifier in polar transmitter

Abstract

An amplifier receives an amplitude signal of a polar modulated signal at a base or gate terminal of a transistor and receives a phase modulated carrier signal of the polar modulated signal at the base or gate terminal of the transistor. The amplifier combines the amplitude signal and the phase modulated signal to produce a full complex waveform at a collector or drain terminal of the transistor.

1 . A method, comprising: 
 receiving an amplitude signal of a polar modulated signal at a gate terminal of a transistor;    receiving a phase modulated carrier signal of said polar modulated signal at said gate terminal of said transistor; and    combining said amplitude signal and said phase modulated signal to produce a full complex waveform at a drain terminal of said transistor.    
   
   
       2 . The method of  claim 1 , comprising pre-distorting said amplitude signal to compensate for non-linearity of said transistor.  
   
   
       3 . The method of  claim 1 , comprising pre-distorting said phase modulated carrier signal to compensate for non-linearity of said transistor.  
   
   
       4 . The method of  claim 1 , comprising: 
 receiving digital segment control signals at an input portion of a digital to analog converter; and    producing said polar modulated signal at an output portion of said digital to analog converter.    
   
   
       5 . The method of  claim 1 , comprising: 
 receiving a power supply signal; and    combining said phase modulated carrier signal and said amplitude signal with said power supply signal.    
   
   
       6 . The method of  claim 5 , comprising: 
 adjusting a voltage at a drain terminal of said transistor under backed off conditions in accordance with output power of said transistor.    
   
   
       7 . An apparatus, comprising: 
 a first amplifier to receive a first amplitude signal of a polar modulated signal at a gate terminal of a first transistor; to receive a first phase modulated carrier signal of said polar modulated signal at said gate terminal of said first transistor; and to combine said first amplitude signal and said first phase modulated signal to produce a first full complex waveform at a drain terminal of said first transistor.    
   
   
       8 . The apparatus of  claim 7 , comprising an amplitude correction module to pre-distort said amplitude signal to compensate for non-linearity of said transistor.  
   
   
       9 . The apparatus of  claim 7 , comprising a phase correction module to pre-distort said first phase modulated carrier signal to compensate for non-linearity of said first transistor.  
   
   
       10 . The apparatus of  claim 7 , comprising a digital to analog converter to receive digital segment control signals at an input portion to produce said polar modulated signal at an output portion of said digital to analog converter.  
   
   
       11 . The apparatus of  claim 7 , comprising an interface module to receive a power supply signal and to combine said first phase modulated carrier signal and said first amplitude signal with said power supply signal.  
   
   
       12 . The apparatus of  claim 11 , wherein said interface module is to adjust a voltage at a drain terminal of said first transistor under backed off conditions in accordance with output power of said first transistor.  
   
   
       13 . The apparatus of  claim 7 , comprising: 
 a second amplifier to receive a second amplitude signal of said polar modulated signal at a gate terminal of a second transistor; to receive a second phase modulated carrier signal of said polar modulated signal at said gate terminal of said second transistor; and to combine said second amplitude signal and said second phase modulated signal to produce a second full complex waveform at a drain terminal of said second transistor.    
   
   
       14 . The apparatus of  claim 13 , comprising a mode select switch to select either said first amplifier or said second amplifier.  
   
   
       15 . An system, comprising: 
 a first antenna; and    a first amplifier coupled to said first antenna, said first amplifier to receive a first amplitude signal of a polar modulated signal at a gate terminal of a first transistor; to receive a first phase modulated carrier signal of said polar modulated signal at said gate terminal of said first transistor; and to combine said first amplitude signal and said first phase modulated signal to produce a first full complex waveform at a drain terminal of said first transistor.    
   
   
       16 . The system of  claim 15 , comprising an amplitude correction module to pre-distort said amplitude signal to compensate for non-linearity of said transistor.  
   
   
       17 . The system of  claim 15 , comprising a phase correction module to pre-distort said first phase modulated carrier signal to compensate for non-linearity of said first transistor.  
   
   
       18 . The system of  claim 15 , comprising a digital to analog converter to receive digital segment control signals at an input portion to produce said polar modulated signal at an output portion of said digital to analog converter.  
   
   
       19 . The system of  claim 15 , comprising an interface module to receive a power supply signal and to combine said first phase modulated carrier signal and said first amplitude signal with said power supply signal.  
   
   
       20 . The system of  claim 19 , wherein said interface module is to adjust a voltage at a drain terminal of said first transistor under backed off conditions in accordance with output power of said first transistor.  
   
   
       21 . The system of  claim 15 , comprising: 
 a second antenna; and    a second amplifier coupled to said second antenna, said second amplifier to receive a second amplitude signal of said polar modulated signal at a gate terminal of a second transistor; to receive a second phase modulated carrier signal of said polar modulated signal at said gate terminal of said second transistor; and to combine said second amplitude signal and said second phase modulated signal to produce a second full complex waveform at a drain terminal of said second transistor.    
   
   
       22 . The system of  claim 21 , comprising a mode select switch to select either said first amplifier or said second amplifier.