Tap Delay Line Calibration for Spur and Noise Reduction
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Solution Overview
Problem
Mismatch in tap delay lines (TDLs) in digital frequency synthesizers and phase modulators leads to noise folding and spurs, degrading signal-to-noise ratio (SNR) and other performance characteristics due to random fluctuations and processing variations.
Innovation Solution
A calibration technique that measures and compensates for mismatches in TDL delay stage elements using self-test algorithms and calibration circuits, adjusting filter parameters and digital encoding to minimize performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If TDL delay stage elements are manufactured without calibration, then device complexity and manufacturing time are reduced, but manufacturing precision and performance characteristics degrade due to mismatch errors
Solution Approach 1:
The patent applies preliminary action by performing delay stage calibration during the manufacturing process before the device is deployed. The calibration circuit measures and compensates for mismatch errors in TDL delay stages during fabrication, storing correction values in memory. This preliminary calibration ensures high manufacturing precision without requiring complex post-manufacturing adjustments, resolving the contradiction between precision and complexity.
2Reliability
If TDL mismatch is not compensated, then device operation is simpler, but noise folding and spurs degrade signal-to-noise ratio and performance characteristics
Solution Approach 1:
The patent introduces an intermediary calibration system that includes calibration circuits, memory storage, and control logic. This intermediary layer measures the mismatch errors in TDL delay stages and applies correction values to compensate for the errors. The calibration system acts as a mediator between the imperfect physical delay stages and the ideal performance requirements, improving signal-to-noise ratio by eliminating noise folding and spurs while maintaining manageable device complexity through modular architecture.
3Measurement precision
If delay stage mismatches are measured and compensated, then resolution and performance of digital frequency synthesizers improve, but calibration time and process complexity increase
Solution Approach 1:
The patent performs delay stage calibration during the manufacturing process rather than during device operation or field deployment. The calibration measurements and compensation value storage are completed beforehand, ensuring high frequency synthesizer resolution without incurring calibration time losses during actual use. This preliminary action approach resolves the contradiction by shifting the time investment to the manufacturing phase.
Solution Approach 2:
The calibration system is designed to be self-contained and automated, with calibration circuits that automatically measure mismatch errors and store correction values without requiring extensive external intervention. The system serves itself by integrating measurement and compensation functions within the device architecture, reducing calibration time and process complexity while achieving high measurement precision for frequency synthesizer resolution.
Data Source
AI summary
In some embodiments, provided are calibration techniques for measuring mismatches between TDL delay stage elements, and in some cases, then compensating for the mismatches to minimize performance degradation.