Subranging ADC Buffer Cascade With Distortion Cancellation
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Solution Overview
Problem
Analog circuit elements introduce detrimental distortion when added to the signal path, necessitating complex designs that compromise circuit complexity, area, and power 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 buffers, allowing buffers to be added to the signal path without additional distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If analog circuit elements are added to the signal path for signal conditioning, then signal processing capability is improved, but distortion is introduced and accuracy deteriorates
Solution Approach 1:
The patent measures the distortion introduced by buffer circuits and uses signal processing to cancel it out. The harmful distortion effect is converted into useful information by measuring it and then subtracting it from the original signal, thereby eliminating the negative impact while maintaining the buffering benefit
Solution Approach 2:
The patent employs feedback by measuring the output signal from the buffer circuit and using this measurement to generate a correction signal. This correction signal is then combined with the original signal to cancel the distortion, creating a closed-loop system that continuously compensates for buffer-induced errors
2Measurement precision
If complex circuit designs are used to reduce distortion, then signal accuracy is improved, but circuit complexity, area, and power consumption increase
Solution Approach 1:
The patent introduces an intermediary signal processing stage that measures the buffer output and generates a correction signal. This intermediary processing is simpler than redesigning the entire buffer circuit and achieves distortion reduction without requiring complex analog circuit modifications
Solution Approach 2:
The patent replaces complex analog circuit design modifications with digital or signal processing-based distortion cancellation. Instead of mechanically redesigning the buffer circuitry to reduce distortion, the solution uses measurement and mathematical cancellation, substituting circuit complexity with processing simplicity
3Measurement precision
If complex circuit designs are used to reduce distortion, then signal accuracy is improved, but power consumption increases
Solution Approach 1:
The patent measures the power-consuming distortion effect and converts it into a correction opportunity. By measuring the distortion and canceling it through signal processing, the system eliminates the need for high-power complex circuit designs, achieving accuracy with lower overall power consumption
Data Source
AI summary
An analog-to-digital converter (ADC) system, such as a subranging ADC, including a cascade of buffer circuits and signal processing circuitry to measure and cancel the distortion introduced by the buffer circuits. Thus, buffer circuits 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.