Patent ID: 8154432

Claim:
A system, comprising: a digital pre-distortion circuit fed by a digital signal for distorting the digital signal; a digital to analog converter (DAC) core section for converting the distorted digital signal into a corresponding analog signal, the DAC core section performing the conversion in accordance with a control signal fed to the DAC core section; a power amplifier (PA) section coupled to an output of the DAC core section for amplifying power in the analog signal; a calibration circuit coupled to an output signal of the power amplifier section for producing, in response to the power in the power amplified analog signal, the control signal fed to the DAC core section; and wherein the calibration circuit comprises a feedback calibration circuit for sensing a waveform of the PA section output signal and for comparing the sensed waveform with a pre-stored reference waveform to generate a digital error correction signal, such digital error correction signal being fed to an input to the DAC core section for adjusting bias settings in individual converter bits of the DAC core section and/or input of the power amplifier section and/or input of the digital pre-distortion circuit to compensate for the DAC core section and PA section nonlinearity.