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US 7,480,349 B2Granted
Low IF receiver systems and methods
AssigneeSkyworks Solutions, Inc.
InventorsNorman J. Beamish, William J. Domino, Morten Damgaard
Life of this patent
Estimating the term…
Abstract
Embodiments of a low intermediate frequency system and method are disclosed. In one embodiment, among others, a method for operating a receiver is disclosed that comprises receiving a radio frequency signal, downconverting the radio frequency signal to a downconverted signal comprising an in-phase component and quadrature component, and estimating a gain and phase imbalance between the in-phase component and the quadrature component.
Claims18
A method for operating a receiver, comprising:
- receiving a radio frequency signal;
- downconverting the radio frequency signal to a downconverted signal comprising an in-phase component and quadrature component;
- and
- estimating a gain and phase imbalance between the in-phase component and the quadrature component,
- wherein the downconverted signal comprises a low intermediate frequency centered at a frequency that is an integer divisor of a sampling frequency of the downconverted signal.
2 more elements
A radio frequency receiver device, comprising:
- a low intermediate frequency receiver system that receives a radio frequency signal and downconverts the radio frequency signal to a downconverted signal, the downconverted signal including an in-phase component and quadrature component, the low intermediate frequency receiver system further including:
- an impairment correction module configured to estimate a gain and phase imbalance between the in-phase component and the quadrature component, wherein the impairment correction module includes an estimator module configured to estimate the gain and phase imbalance during a first time interval;
- and
- a downconverter coupled to the impairment correction module, wherein the downconverter is configured to multiply a signal received from the impairment correction module with a local oscillator signal to provide the downconverted signal;
- and
- a switching module configured to receive the downconverted signal, measure the energy of an adjacent channel interferer of the downconverted signal, and reposition in frequency the adjacent channel interferer when the adjacent channel interferer energy exceeds a preset threshold.
3 more elements
A radio frequency receiver device, comprising:
- means for receiving a radio frequency signal;
- means for downconverting the radio frequency signal to a downconverted signal, the downconverted signal including an in-phase component and quadrature component;
- means for estimating a gain and phase imbalance between the in-phase component and the quadrature component;
- means for compensating for the gain and phase imbalance;
- and
- means for multiplying a signal received from the means for compensating with a local oscillator signal to provide a second signal.
3 more elements
A radio frequency receiver device, comprising:
- a low intermediate frequency receiver system that receives a radio frequency signal and downconverts the radio frequency signal to a downconverted signal, the downconverted signal including an in-phase component and quadrature component, the low intermediate frequency receiver system further including:
- an impairment correction module configured to estimate a gain and phase imbalance between the in-phase component and the quadrature component, wherein the impairment correction module includes a compensator module configured to reduce the gain and phase imbalance for the in-phase component and the quadrature component based on the estimate of the gain and phase imbalance;
- a downconverter coupled to the impairment correction module, wherein the downconverter is configured to multiply a signal received from the impairment correction module with a local oscillator signal to provide the downconverted signal;
- and
- a switching module configured to receive the downconverted signal, measure the energy of an adjacent channel interferer of the downconverted signal, and reposition in frequency the adjacent channel interferer when the adjacent channel interferer energy exceeds a preset threshold.
2 more elements
A radio frequency receiver device, comprising:
- a low intermediate frequency receiver system that receives a radio frequency signal and downconverts the radio frequency signal to a downconverted signal, the downconverted signal including an in-phase component and quadrature component, the low intermediate frequency receiver system further including:
- an impairment correction module configured to estimate a gain and phase imbalance between the in-phase component and the quadrature component;
- wherein the downconverted signal comprises a low intermediate frequency centered at a frequency that is an integer divisor of a sampling frequency of the downconverted signal.
Dependencies are inferred from the claim text.