Transmitter Non-Linearity Correction With Feedback Compensation
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Solution Overview
Problem
Transmitters in medical imaging devices suffer from non-linearity issues due to high voltage transistors and capacitors, leading to signal distortions, limited feedback loop accuracy, and reduced bandwidth, which affect the quality of generated images.
Innovation Solution
Implementing a circuit design with non-linear correction circuitry and error current correction circuitry to mitigate non-linearity by using transistors, capacitors, resistors, and switches to create feedback loops that adjust gain and phase to correct rectified capacitive and frequency squared errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage transistors and capacitors are used in transmitters, then the transmitter can operate at high voltage, but non-linearity issues and signal distortions occur
Solution Approach 1:
The patent implements feedback loops that sense the output signal and generate correction signals to compensate for non-linearity. The feedback mechanism monitors the actual output and adjusts the input or intermediate stages to maintain linearity, directly resolving the contradiction between high voltage operation and signal linearity.
Solution Approach 2:
The patent introduces intermediary correction circuits and compensation stages between the high voltage transistor stages and the output. These intermediary elements act as mediators that correct the non-linear distortions introduced by the high voltage components, allowing high voltage operation while maintaining signal integrity.
2Device complexity
If conventional transmitter circuits are used, then the circuit structure is simple, but feedback loop accuracy is limited and bandwidth is reduced
Solution Approach 1:
The patent divides the feedback loop into multiple segmented stages, each handling specific frequency ranges or correction functions. This segmentation allows each stage to be optimized for higher accuracy without requiring the entire system to become overly complex, resolving the contradiction between simplicity and precision.
Solution Approach 2:
The patent extends the feedback correction into additional dimensions by implementing both amplitude and phase correction paths, and by operating across multiple frequency bands simultaneously. This multi-dimensional approach enhances feedback accuracy without proportionally increasing circuit complexity.
3Power
If high voltage transistors are used, then power output is increased, but non-linearity causes signal distortion and reduces image quality
Solution Approach 1:
The patent converts the harmful non-linear effects of high voltage transistors into beneficial correction opportunities by designing the feedback system to specifically target and compensate for the types of distortion these transistors introduce. The non-linearity is not eliminated but is transformed into a predictable error that can be systematically corrected, allowing high power output while maintaining image quality.
Data Source
AI summary
Methods, apparatus, systems, and articles of manufacture are described to correct non-linearity in transmitters. An example system includes an input stage, a driver, an input terminal of the driver coupled to an output terminal of the input stage; an output buffer, an input terminal of the output buffer coupled to an output terminal of the driver, an output terminal of the output terminal coupled to a first input terminal of the input stage via a resistor; and non-linear correction circuitry having an input terminal and an output terminal, the input terminal of the non-linear correction circuitry coupled to the output terminal of the output buffer and the first input terminal of the input stage via the resistor, the output terminal of the non-linear correction circuitry coupled to the output terminal of the input stage and the input terminal of the driver.