Transmitter Nonlinearity Correction Circuit for Accurate Feedback
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Solution Overview
Problem
Transmitters in medical imaging devices suffer from non-linearity issues due to non-linear active devices, leading to signal distortions and limited feedback loop accuracy, which affects the quality of image generation.
Innovation Solution
The implementation of non-linear correction circuitry, including error current correction circuitry and non-linear correction circuitry, to mitigate non-linearity by adjusting gain and phase to correct rectified capacitive current, capacitive voltage, and frequency squared nonlinear errors through feedback loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-linear active devices are used in transmitters, then device complexity is reduced and ease of manufacture is improved, but non-linearity causes signal distortions and limits feedback loop accuracy
Solution Approach 1:
The patent implements feedback loops that sense output signals and generate correction currents to compensate for non-linear distortions. The feedback mechanism continuously monitors the transmitter output and adjusts the drive signal to maintain linearity, thereby improving feedback loop accuracy without requiring completely linear active devices
Solution Approach 2:
The patent introduces correction circuitry as an intermediary between the non-linear active devices and the output stage. This intermediary circuit processes the feedback signal and generates correction currents that compensate for the non-linearities introduced by the active devices, allowing the use of simpler devices while maintaining accuracy
2Measurement precision
If non-linear correction circuitry is added to correct signal distortions, then feedback loop accuracy is improved, but device complexity increases
Solution Approach 1:
The correction circuitry is segmented into distinct functional blocks: feedback sensing circuitry, correction current generation circuitry, and combination circuitry. Each segment performs a specific function, making the overall complex system more manageable and allowing for modular implementation and optimization
Solution Approach 2:
The correction circuitry dynamically adjusts parameters such as gain and phase of the correction currents based on the feedback signal characteristics. By changing these parameters in response to operating conditions, the circuit achieves high accuracy across different signal levels and frequencies without requiring overly complex fixed-parameter designs
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.