Calibration systems for wireless electronic devices

摘要

A calibration system may be provided for calibrating wireless communications circuitry in an electronic device during manufacturing. The calibration system may include data acquisition equipment for receiving an amplitude-modulated calibration signal from the electronic device. The calibration system may include calibration computing equipment for extracting pre-distortion coefficients from the amplitude-modulated calibration signal. The calibration computing equipment may be configured to detect a bulk phase drift in the amplitude-modulated calibration signal. The calibration computing equipment may be configured to remove the bulk phase drift from the amplitude-modulated calibration signal. The wireless communications circuitry may include a power amplifier that distorts a signal generated by the wireless communications circuitry. The wireless communications circuitry may include a pre-distortion compensator for countering the distortion. The pre-distortion coefficients determined from the phase drift corrected amplitude-modulated calibration signal may be used by the pre-distortion compensator when countering the distortion.

主权项

1. A method of calibrating an electronic device having wireless communications circuitry with a calibration system, wherein the calibration system includes data acquisition equipment and calibration computing equipment and wherein the wireless communications circuitry comprises a calibration pattern generator and local oscillator, the method comprising:
with the wireless communications circuitry, transmitting an amplitude-modulated calibration signal to the data acquisition equipment; with the data acquisition equipment, transferring the amplitude-modulated calibration signal to the calibration computing equipment; with the calibration computing equipment, extracting a phase drift correction from the amplitude-modulated calibration signal; with the calibration computing equipment, extracting pre-distortion coefficients from the amplitude-modulated calibration signal; with the calibration pattern generator, generating a known amplitude-modulated calibration pattern; with the local oscillator, generating a carrier signal; and with the wireless communications circuitry, before transmitting the amplitude-modulated calibration signal to the data acquisition equipment, modulating the carrier signal with the known amplitude-modulated calibration pattern to create the amplitude-modulated calibration signal.