Self-calibration technique for carrier aggregation receivers

摘要

A technique to provide calibration in a receiver that receives multiple carriers and uses multiple receive signal paths to down-convert and process the multiple carrier signals.

主权项

1. A method of calibrating a wireless communication receiver that includes a plurality of receive signal paths to process a plurality of carriers, in which respective receive signal paths include respective mixers, filters and baseband processing, the method of calibrating comprising:
generating a calibration signal at an input node of a first mixer that is used in a first receive signal path to receive and mix a first carrier of the plurality of carriers, in which the first mixer is configured to operate with a first local oscillator signal having a first local oscillator frequency to mix the first carrier with the first local oscillator signal; coupling the calibration signal back up the first receive signal path to an output node of a first low noise amplifier (LNA) in the first receive signal path; coupling the calibration signal from the output node of the first LNA to an output node of a second LNA in a second receive signal path, wherein the second receive signal path has a second mixer configured to mix a second carrier of the plurality of carriers with a second local oscillator signal having a second local oscillator frequency and wherein the first local oscillator signal is different in frequency from the second local oscillator signal; mixing the calibration signal with the second local oscillator signal in the second mixer to generate a down-converted calibration signal at an output node of the second mixer in the second receive signal path; and utilizing the down-converted calibration signal to perform at least one calibration procedure on the wireless communication receiver.