Integrated circuit, wireless communication unit and method for determining quadrature imbalance
AssigneeFreescale Semiconductor, Inc.
InventorsNorman Beamish, Conor O'Keeffe, Patrick Pratt
Life of this patent
Estimating the term…
Abstract
An integrated circuit comprising processing logic for operably coupling to radio frequency (RF) receiver circuitry arranged to receive a wireless network signal. The receiver circuitry generates in-phase and quadrature digital baseband representations of the wireless network signal. The processing logic determines quadrature (I/Q) imbalance of the RF receiver circuitry based on the in-phase and quadrature digital baseband representations of the wireless network signal.
Claims19
An integrated circuit comprising:
- radio frequency (RF) receiver circuitry arranged to receive a wireless network signal, wherein the receiver circuitry generates in-phase and quadrature digital baseband representations of the wireless network signal;
- and
- processing logic operably coupled to the radio frequency (RF) receiver circuitry and arranged to:
- determine quadrature (I/Q) imbalance of the RF receiver circuitry based on the in-phase and quadrature digital baseband representations of the wireless network signal, wherein the processing logic is arranged to set the RF receiver circuitry to operate in a direct conversion radio (DCR) mode for the purpose of determining quadrature imbalance and determine quadrature imbalance only in the DCR mode;
- and
- to set the RF receiver circuitry to operate in an intermediate frequency (I/F) mode when I/Q imbalance has been determined.
A method for determining quadrature (I/Q) imbalance within radio frequency (RF) receiver circuitry of a wireless communication unit, the method comprising the steps of:
- receiving a wireless network signal;
- setting a first signal generated by a local oscillator of the RF receiver circuitry to a first frequency for the purpose of measuring quadrature imbalance;
- generating in-phase and quadrature digital baseband representations of the wireless network signal;
- determining quadrature (I/Q) imbalance of the RF receiver circuitry based on the in-phase and quadrature digital baseband representations of the wireless network signal;
- and
- setting a second signal generated by the local oscillator of the RF receiver circuitry to a second frequency for the purpose of normal operations, wherein the first frequency is not used for the purpose of normal operations.
Dependencies are inferred from the claim text.