DC Component Compensation in RF Chains Using Iterative Vector Adjustment
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Solution Overview
Problem
Radio frequency reception devices face challenges in suppressing the DC component, which can saturate amplification stages and analog-to-digital converters, especially when multiple amplification stages are involved, as existing compensation methods are insufficient or lead to saturation.
Innovation Solution
A process that calculates multiple compensation values from a single measurement in the digital stage to be applied at multiple points in the analogue chain, using iterative calculations to form a compensation vector that cancels the DC component without saturating amplification components or analog-to-digital converters, involving gain vector calculations, unit gain vectors, and iterative adjustments to ensure the compensation signals do not exceed the maximum admissible value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single retroactive low-pass filter loop is used for DC component compensation at the end of the analogue chain, then the DC component can be compensated at that point, but previous amplification stages may still be saturated by the amplified DC component
Solution Approach 1:
The patent divides the single compensation point into multiple compensation points distributed throughout the analogue chain. Each compensation point independently compensates for DC components at its specific location, preventing saturation of downstream amplification stages while maintaining overall system reliability.
Solution Approach 2:
The patent applies DC component compensation in advance at multiple points before the signal reaches subsequent amplification stages. By compensating earlier in the signal path, the DC component is reduced before it can be amplified, preventing saturation of downstream stages.
2Power
If multiple amplification stages are used to process the signal, then signal amplification is achieved, but the DC component is amplified by all stages and can become significant
Solution Approach 1:
The patent extracts and removes the harmful DC component from the signal at multiple points throughout the amplification chain. By continuously extracting the DC component at each stage, the harmful effect of DC amplification is eliminated while the useful signal amplification is preserved.
Solution Approach 2:
The patent uses the presence of DC components at each amplification stage as information to calculate appropriate compensation values. The DC component, rather than being merely a harmful artifact, becomes a measurement reference that enables precise compensation at each point in the chain.
3Device complexity
If compensation values are calculated iteratively from a single measurement, then the complexity of multiple measurements is reduced, but the accuracy of compensation distribution across multiple points must be maintained
Solution Approach 1:
The patent makes a single measurement serve multiple purposes by using it to calculate compensation values for multiple compensation points. The single measurement of the DC component at the output is universally applied to determine the appropriate compensation at each intermediate point through iterative calculation, reducing measurement complexity while maintaining precision.
Solution Approach 2:
The patent employs iterative calculation where compensation values are refined based on feedback from the measured DC component. The process continuously adjusts the compensation values at each point based on the actual measured DC level, ensuring accurate compensation distribution across all points without requiring multiple independent measurements.
Data Source
AI summary
Device for compensating a DC component inherent in any radio frequency chain in which from a single measurement, generally obtained from a digital stage, a set of multiple compensation values is determined by a compensation value vector generating module and which compensation values are applied to multiple compensation points of the analog chain. The compensation values are calculated by an iterative process converging toward cancellation of the DC component and avoid saturating amplification components and components of the analog-to-digital converter. The module includes compensation value calculation units each configured to calculate a respective compensation value and provide the calculated compensation value to the respective compensation point.