Transmitter first/second digital predistortion and first/second adaption circuitry with feedback

A transmitter circuit comprising:

• (A) an input lead coupled to a digital input signal;
• (B) an output lead coupled to an amplified RF signal;
• (C) first digital predistortion circuitry having a digital input coupled to the input lead, a parameter input receiving a first set of predistortion parameters, and an output;
• (D) second digital predistortion circuitry having a digital input coupled to the output of the first digital predistortion circuitry, a parameter input receiving a second set of predistortion parameters, and an output coupled to the output lead;
• (E) first adaption circuitry having a first error input coupled with the output lead and having a parameter output coupled with the parameter input of the first digital predistortion circuitry;
• and
• (F) second adaption circuitry having a second error input coupled with the output lead and having a parameter output coupled with the parameter input of the second digital predistortion circuitry.