Predistortion Calibration In A Transceiver Assembly

Abstract

Systems and methods are provided for calibrating a digital predistorter in an integrated transceiver circuit. A digital transmitter path provides a signal from a digital input. The transmitter path includes a digital predistorter that predistorts the digital input to mitigate nonlinearities associated with a power amplifier. The integrated transceiver circuit further includes a receiver path associated with the digital transmitter path. A coupling element provides the signal from the transmitter path to the receiver path. A signal evaluator determines values for at least one parameter associated with the digital predistorter based on the signal.

1 . An integrated transceiver circuit, comprising:
 a digital polar transmitter path that provides an amplitude/phase signal from a digital input, the transmitter path including at least one digital predistorter that predistorts the digital input to mitigate nonlinearities associated with a power amplifier;   a receiver path associated with the digital transmitter path;   a coupling element that provides the signal from the transmitter path to the receiver path; and   a signal evaluator that determines values for at least one parameter associated with the digital predistorter based on the signal.   
   
   
       2 - 11 . (canceled) 
   
   
       12 . The circuit of  claim 1 , the power amplifier comprising an external power amplifier that is external to the integrated transceiver circuit. 
   
   
       13 . The circuit of  claim 12 , the power amplifier further comprising an internal power amplifier, the output of the internal power amplifier being provided to the external power amplifier. 
   
   
       14 . The circuit of  claim 12 , the digital transmitter path comprising an amplitude modulated path that controls the supply to the external amplifier according to a first digital input, and a phase modulated path that provides a radio frequency input to the external power amplifier according to a second digital input. 
   
   
       15 . The circuit of  claim 14 , the phase modulated path comprising a digitally controlled oscillator. 
   
   
       16 . (canceled) 
   
   
       17 . The circuit of  claim 14 , the phase modulated path comprising a digital predistorter that adjusts the second digital input to mitigate nonlinearities associated with the power amplifier. 
   
   
       18 . The circuit of  claim 14 , the amplitude modulated path comprising a digital predistorter that adjusts the first digital input to mitigate nonlinearities associated with the power amplifier. 
   
   
       19 - 20 . (canceled) 
   
   
       21 . A method of calibrating a predistortion component in a transceiver system, comprising:
 providing a first digital signal, containing amplitude information related to a desired analog signal, to a transmitter path;   providing a second digital signal, containing phase information related to the desired analog signal, to the transmitter path;   predistorting at least one of the first digital signal and the second digital signal in the digital domain according to at least one predistortion parameter;   generating an analog signal from the first digital signal and the second digital signal; and   processing the analog signal at a receiver path associated with the transmitter path to determine values for the at least one predistortion parameter.   
   
   
       22 - 26 . (canceled) 
   
   
       27 . The method of  claim 21 , wherein the receiver path comprises a history capacitor coupled to a rotating capacitor.