Wireless signal receiving method and receiver for in-phase to quadrature (I/Q) mismatch calibration
AssigneeRichWave Technology Corp.
InventorI-Hung Lin
Life of this patent
Estimating the term…
Abstract
A receiver receiving a Radio Frequency (RF) signal and generating a baseband signal is provided. An RF module receives the RF signal and down convert the RF signal according to a first oscillation frequency to generate an Intermediate Frequency (IF) signal. An IF module is coupled to the RF module and arranged to receive the IF signal and down convert the IF signal according to a second oscillation frequency to generate the baseband signal. A calibration module is coupled to the RF module and arranged to calculate the IF signal according to a third oscillation frequency to detect an I/Q mismatch, and generate an adjustment signal, accordingly, to calibrate the I/O mismatch.
Claims23
A receiver receiving a Radio Frequency (RF) signal and generating a baseband signal, comprising:
- an RF module, arranged to receive the RF signal and down convert the RF signal according to a first oscillation frequency to generate an Intermediate Frequency (IF) signal;
- an IF module, coupled to the RF module and arranged to receive the IF signal and down convert the IF signal according to a second oscillation frequency to generate the baseband signal;
- and
- a calibration module, coupled to the RF module and arranged to calculate the IF signal according to a third oscillation frequency to detect an in-phase to quadrature (I/Q) mismatch, and generate an adjustment signal, accordingly, to calibrate the I/Q mismatch.
A wireless signal receiving method receiving a Radio Frequency (RF) signal and generating a baseband signal via an in-phase to quadrature (I/Q) channel, comprising:
- in a calibration mode:
- providing a test signal to an input of the I/Q channel, wherein the test signal has a frequency and an amplitude;
- down converting the test signal according to a first oscillation frequency to generate an Intermediate Frequency (IF) signal at an output of the I/Q channel;
- and
- mixing the IF signal with a third oscillation frequency and performing an accumulating operation to detect an I/Q mismatch;
- and
- in a normal mode:
- receiving the RF signal and down converting the RF signal according to the first oscillation frequency to generate the IF signal at the output of the I/Q channel;
- and
- down converting the IF signal according to a second oscillation frequency and calibrating the I/Q mismatch to generate the baseband signal.
Dependencies are inferred from the claim text.