Adaptive cartesian loop transmitter for broadband and optimal loop stability adjustment

An integrated circuit including a linearizer circuit, the linearizer circuit comprising:

• a power amplifier for transmitting a linearized radio signal;
• a forward path for routing a signal to be transmitted by the power amplifier, the forward path including a gain and low-pass filter having at least one programmable zero;
• a feedback path, operably coupled to the power amplifier and the forward path for feeding back a portion of the signal to be transmitted;
• and
• a microprocessor for applying a first phase training signal at a first frequency and a second phase training signal at a second frequency different from the first frequency to the forward path, wherein the microprocessor uses the first and second phase training signals to determine an amount of delay in the linearizer circuit, and to reprogram the at least one programmable zero responsive to determining the amount of delay in order to compensate for the amount of delay.