Wideband quadrature error detection and correction
AssigneeAnalog Devices, Inc.
InventorsRaju Hormis, Steven R. Bal, Antonio Montalvo, David J. McLaurin, Martin McCormick
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Abstract
A transmission module is provided that includes a transmitter, a loopback receiver, and a QEC controller. The QEC controller identifies quadrature imbalance in the transmitter based at least one a comparison of the data signals at the output of the loopback receiver with data signals at the input of the transmitter. Based on the comparison, the QEC controller can adjust one or more characteristics of the transmitter to correct quadrature errors in the transmitter.
Claims20
An apparatus, comprising:
- a transmitter;
- a loopback receiver;
- a controller configured to:
- receive a first data signal from the loopback receiver,
- identify an in-phase/quadrature-phase imbalance in the transmitter based at least on a comparison of the first data signal received from the loopback receiver with a buffered data signal that corresponds to a data signal received by the transmitter as an input, and
- correct the in-phase/quadrature-phase imbalance present in the transmitter based at least in part on the comparison of the first data signal received from the loopback receiver with the buffered data signal.
An electronically-implemented method of quadrature error correction comprising:
- receiving a first data signal from a loopback receiver,
- identifying an in-phase/quadrature-phase imbalance in the transmitter based at least on a comparison of the first data signal received from the loopback receiver with a buffered data signal that corresponds to a data signal received by the transmitter, and
- correcting the in-phase/quadrature-phase imbalance present in the transmitter based at least in part on the comparison of the first data signal received from the loopback receiver with the buffered data signal.
An apparatus comprising:
- a transmitter;
- a loopback receiver;
- a means for quadrature error correction comprising:
- a means for receiving a first data signal from the loopback receiver that corresponds to a second data signal generated by the transmitter as an output,
- a means for identifying an in-phase/quadrature-phase imbalance in the transmitter based at least on a comparison of the first data signal received from the loopback receiver with a buffered data signal that corresponds to a data signal received by the transmitter, and
- a means for correcting the in-phase/quadrature-phase imbalance present in the transmitter based at least in part on the comparison of the first data signal received from the loopback receiver with the buffered data signal.
A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:
- receive a first data signal from a loopback receiver,
- identify an in-phase/quadrature-phase imbalance in the transmitter based at least on a comparison of the first data signal received from the loopback receiver with a buffered data signal that corresponds to a data signal received by the transmitter, and
- correct the in-phase/quadrature-phase imbalance present in the transmitter based at least in part on the comparison of the first data signal received from the loopback receiver with the buffered data signal.
Dependencies are inferred from the claim text.