Digital Calibration of Analog Distortion Using Split Analog Front-End
AssigneeBroadcom Corporation
InventorsFrank van der Goes, Jan Roelof Westra
Life of this patent
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Abstract
A receiver is disclosed that is capable of correcting for harmonic distortion injected into received analog signals. The receiver splits the analog signal in the analog front-end and modifies the split analog signals with a difference signal. After amplification and/or sampling, the modified analog signals are recombined in a main data pathway and are kept separate in a secondary pathway. Utilizing the difference signal, a feedback loop that includes distorters and an LMS filter detects the distortion coefficient of the harmonic distortion. A distorter in the main data pathway utilizes the detected distortion coefficient to correct the harmonic distortion in the analog signal.
Claims20
A receiver, comprising:
- a difference signal module configured to create a difference between a first analog signal and a second analog signal, the first analog signal being substantially the same as the second analog signal and both being representative of an analog input signal;
- an amplifier module configured to amplify the first analog signal and the second analog signal, the amplifier module injecting harmonic distortion into the first analog signal to create a first amplified analog signal, and injecting the harmonic distortion into the second analog signal to create a second amplified analog signal;
- a detection analog-to-digital converter configured to convert from analog to digital each of the first amplified analog signal and the second amplified analog signal to generate respective first and second digital component signals;
- a distortion detection module configured to determine a distortion coefficient of the harmonic distortion based on the first digital component signal and the second digital component signal;
- and
- a distortion correction module configured to correct harmonic distortion in a main digital signal based on the distortion coefficient.
A receiver, comprising:
- a detection analog-to-digital converter configured to convert a split analog signal into the digital domain to generate a split digital signal, the split analog signal including a first component having harmonic distortion and a second component having the harmonic distortion;
- a distortion detection module configured to determine a distortion coefficient of the harmonic distortion based on the split digital signal;
- and
- a distortion correction module configured to receive the distortion coefficient from the distortion detection module and to correct the harmonic distortion in a main signal.
A method of correcting for harmonic distortion generated in a receiver, the method comprising:
- generating, from an analog input signal, a first analog component signal and a second analog component signal that differ from each other by a difference signal and that each include the harmonic distortion;
- converting the first analog component signal to the digital domain to create a first digital component signal, and the second analog component signal to the digital domain to create a second digital component signal;
- determining a distortion coefficient of the harmonic distortion based on the first digital component signal and the second digital component signal;
- and
- correcting the harmonic distortion in a main digital signal based on the distortion coefficient.
Dependencies are inferred from the claim text.