Buffer Cascade Distortion Cancellation for Accurate Signal Conditioning
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Solution Overview
Problem
Analog circuit elements introduced in signal conditioning circuits often cause distortion, leading to undesirable trade-offs in circuit complexity, area, and power consumption when optimized for high accuracy.
Innovation Solution
A cascade of buffer circuits and signal processing circuitry is used to measure and cancel the distortion introduced by the buffer circuits, allowing for the addition of buffers without detrimental effects by generating a corrected input signal through error component subtraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If buffer circuits are added to the signal path for signal conditioning, then signal buffering and isolation are improved, but distortion is introduced and circuit complexity increases
Solution Approach 1:
The patent measures the distortion generated by the buffer circuits and uses this harmful effect as a reference signal to create a cancellation mechanism. The distortion signal is processed through additional buffer circuits and subtracted from the original signal path, converting the previously harmful distortion into a useful cancellation reference that eliminates the net distortion effect.
Solution Approach 2:
The patent implements a feedback mechanism where the distortion signal from the buffer circuits is continuously measured, processed, and fed back to the signal path in inverted form. This feedback loop enables real-time cancellation of distortion by comparing the original signal with the distorted version and subtracting the difference, maintaining signal fidelity despite the presence of buffer circuits.
2Measurement precision
If buffer circuits are optimized for high accuracy to reduce distortion, then signal accuracy is improved, but circuit complexity, area, and power consumption increase
Solution Approach 1:
The patent divides the signal processing function into separate segments: the main buffer circuits for signal conditioning and a separate distortion measurement and cancellation path. This segmentation allows the use of simple, low-complexity buffer circuits while achieving high accuracy through the additional distortion correction stage, avoiding the need for highly complex optimized buffers.
Solution Approach 2:
The patent introduces an intermediary distortion measurement and processing path that mediates between the simple buffer circuits and the final high-accuracy output. This intermediary path measures the distortion, processes it through additional buffer circuits, and combines it with the original signal to produce the corrected output, enabling high accuracy without requiring the main buffers to be complex.
Data Source
AI summary
A signal conditioning circuit to reduce detrimental effects of analog circuit elements. The techniques described herein provide a cascade of buffer circuits and signal processing circuitry to measure and cancel the distortion introduced by the buffer circuits. Thus, a buffer can be added to the signal path of an input signal without the detrimental effects, such as added distortion, that typically accompany the addition of buffers.