US 8,798,198 B2 · Calibration systems for wireless electronic devices

Abstract

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.

Claims18

Dependent claims

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.

5 more elements

Dependencies are inferred from the claim text.

Calibration systems for wireless electronic devices

Life of this patent

Calibration systems for wireless electronic devices

Life of this patent

Abstract

Claims18