Transmitter Calibration Module Optimizing DC Offset and Image Rejection
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Solution Overview
Problem
Conventional communications systems face inefficiencies in compensating for undesirable noise and interference caused by imperfections within the communications transmitter, leading to degraded signal recovery at the receiver, and current methods consume excessive power and area in integrated circuits.
Innovation Solution
A communications transmitter with a calibration module that optimizes operational parameters such as DC offsets and phase responses to reduce noise and interference by determining statistical parameters and adjusting compensation parameters, thereby enhancing signal recovery without the need for unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional communications systems use a loop back configuration with a specialized communications receiver to determine undesirable noise and interference, then measurement precision is improved, but use of energy and area increase significantly
Solution Approach 1:
The patent extracts the calibration function from a separate specialized receiver and integrates it directly into the transmitter. The transmitter now performs self-calibration by generating calibration signals, measuring its own output imperfections through feedback, and adjusting its parameters without requiring an external receiver system.
Solution Approach 2:
The transmitter is given multi-functionality by enabling it to perform both its primary transmission function and its own calibration function. The same transmitter hardware that sends communications signals also generates calibration signals and processes feedback for self-adjustment, eliminating the need for dedicated calibration equipment.
2Measurement precision
If conventional communications systems use a loop back configuration with a specialized communications receiver to determine undesirable noise and interference, then measurement precision is improved, but area consumption increases
Solution Approach 1:
The patent removes the separate specialized receiver component and its associated hardware from the system. By integrating calibration functionality into the existing transmitter, the physical area required for additional receivers, connectors, and feedback paths is eliminated.
Solution Approach 2:
The calibration function is merged with the transmitter's existing hardware resources. The same signal generation, filtering, and processing components used for normal transmission are repurposed for calibration operations, maximizing resource utilization and minimizing additional area requirements.
3Device complexity
If DC offsets are present in the communications transmitter, then device complexity is reduced, but object-generated harmful factors increase
Solution Approach 1:
The patent implements preliminary calibration actions that detect and correct DC offsets and other imperfections before normal communications transmission begins. By pre-adjusting the transmitter parameters based on measured imperfections, the system eliminates harmful factors in advance without requiring complex real-time correction mechanisms during operation.
Solution Approach 2:
The patent establishes a feedback loop where the transmitter measures its own output signal for imperfections such as DC offsets and image leakage, then uses this feedback information to automatically adjust its operating parameters. This closed-loop control system continuously maintains optimal performance without manual intervention.
Data Source
AI summary
A method and apparatus is disclosed to optimize one or more operational parameters of a communications transmitter to reduce undesirable noise and/or interference embedded within a transmitted communications signal resulting from one or more imperfections. A baseband processor selects one or more calibration signals to allow for optimization of one or more statistical parameters. A calibration module determines the one or more statistical parameters of the transmitted communications signal in response to the one or more calibration signals. The calibration module provides one or more compensation parameters indicative of the one or more statistical parameters to the baseband processor module. The baseband processor adjusts the one or more operational parameters of the communications transmitter in response to the one or more compensation parameters. The calibration module and the baseband processor continue to determine the one or more statistical parameters and to adjust the one or more operational parameters in a similar manner until the one or more statistical parameters are optimized.