DC Offset Correction Using Dynamic Gain Compression
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Solution Overview
Problem
Existing DC offset correcting devices face challenges in accurately detecting and compensating for small DC offset signals, leading to increased circuit scale and power consumption due to the need for high-gain amplifiers, which is inefficient and power-intensive.
Innovation Solution
A DC offset correcting device that uses a test signal with equal positive and negative amplitudes, an amplitude detector, a level compressor with variable gain, and a comparator to accurately adjust the DC offset, allowing for precise correction without the need for large-scale or high-power circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-gain amplifiers are used to detect small DC offset signals, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent implements dynamic gain adjustment in the signal processing chain. The gain of the level compressor is varied based on the input signal level, allowing the system to achieve high effective gain for small DC offset signals without requiring high-gain amplifiers throughout the entire system. This dynamic adaptation resolves the contradiction by providing high measurement precision only when needed for small signals.
Solution Approach 2:
The patent changes the operating parameters of the signal processing circuitry, specifically the gain parameter of the level compressor. By adjusting the gain parameter dynamically based on signal level, the system achieves high effective gain for DC offset detection without the power consumption penalty of continuously operating high-gain amplifiers.
2Measurement precision
If high-gain amplifiers are used to detect small DC offset signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses dynamic gain control to achieve high measurement precision without the need for complex high-gain amplifier circuits. The level compressor's variable gain is controlled by detecting the signal level and adjusting the gain accordingly, simplifying the overall circuit architecture while maintaining high detection accuracy.
Solution Approach 2:
The patent introduces a level compressor as an intermediary component between the signal source and the DC offset detector. This intermediary dynamically adjusts the signal level, providing high effective gain for small signals without requiring complex high-gain amplifier circuits, thus reducing device complexity while maintaining measurement precision.
3Measurement precision
If variable gain is used to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the level compression function with the gain control function into a single integrated component. The level compressor simultaneously performs signal level adjustment and gain control based on the detected signal level, reducing the number of separate components and simplifying the overall circuit architecture while maintaining high measurement precision.
Solution Approach 2:
The level compressor is designed as a multi-functional component that both compresses the signal level and provides dynamic gain control. This universal component performs multiple functions (level detection, gain adjustment, signal conditioning) that would traditionally require separate circuits, thereby improving measurement precision without proportionally increasing device complexity.
Data Source
AI summary
A signal generator generates a test signal including a positive signal and a negative signal which have the same amplitude. The signal generator corrects a DC level of the test signal based on a DC offset correcting signal supplied thereto, and supplies the corrected test signal to a frequency converter. An amplitude detector detects the amplitudes of the positive and negative signals of the test signal processed by the frequency converter. A level compressor converts in level the amplitudes of the positive and negative signals which are detected by the amplitude detector, with a gain variable depending on an input level thereto. A comparator compares the amplitudes of the positive and negative signals which are converted in level by the level compressor, with each other. An offset adjuster supplies the DC offset correcting signal depending on a compared result from the comparator to the signal generator.