Parallel Data Bus Duty Cycle Compensation Using Trim Calibration
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Solution Overview
Problem
Existing data bus duty cycle distortion compensation techniques fail to accurately account for local variations between parallel signal paths in electrical circuit devices, leading to increased errors and sub-optimal performance, especially at high input/output speeds.
Innovation Solution
A calibration circuit determines a representative duty cycle for multiple parallel signal paths using passive low pass filters and compares it to a reference value, adjusting trim values to compensate for distortion, thereby calibrating the duty cycles of signals across the data bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing data bus duty cycle distortion compensation techniques are used, then the compensation process is simple, but the accuracy is insufficient due to failure to account for local variations between parallel signal paths
Solution Approach 1:
The patent divides the data bus into multiple parallel signal paths and assigns separate calibration circuits to each path. This segmentation allows each circuit to independently measure and compensate for local variations in its specific signal path, thereby improving measurement accuracy without requiring a single overly complex centralized system.
Solution Approach 2:
The patent introduces an intermediary calibration circuit between the signal source and the destination that actively measures duty cycle distortion and applies compensation. This intermediary component bridges the gap between simple compensation techniques and the need for high accuracy by providing real-time measurement and adjustment capabilities.
2Measurement precision
If calibration is performed for each parallel signal path individually, then accuracy improves, but the calibration process becomes more complex and time-consuming
Solution Approach 1:
The patent performs duty cycle calibration during the manufacturing process as a preliminary action before the device is deployed. This advance calibration captures local variations in parallel signal paths and stores compensation values that can be applied during operation, eliminating the need for time-consuming calibration during actual use while maintaining high accuracy.
Solution Approach 2:
The patent creates a model or representation of the duty cycle characteristics for each parallel signal path through measurement and calibration. These calibrated models are then used to guide compensation operations, allowing the system to achieve accurate duty cycle correction without repeatedly performing complex calibration procedures during operation.
3Productivity
If high input/output speeds are used, then productivity increases, but duty cycle distortion increases leading to more errors
Solution Approach 1:
The patent implements a feedback mechanism where the calibration circuit continuously monitors the duty cycle of signals on each parallel path and adjusts compensation values accordingly. This closed-loop feedback system enables the device to maintain signal accuracy even at high input/output speeds by dynamically correcting duty cycle distortion as it occurs.
Solution Approach 2:
The patent changes the duty cycle parameter through active compensation adjustments based on measured local variations. By modifying the duty cycle parameter in real-time or through pre-stored calibration values, the system maintains signal integrity and reliability even when operating at high speeds where distortion would normally increase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces duty cycle distortion, improving signal accuracy and performance by compensating for both systematic and local variations, particularly in systems with a low number of parallel signal paths, and reduces latency through quick calibration routines.
Implementation Method 1
A calibration circuit samples the multiple parallel voltage signals to extract a duty cycle component representative of the multiple voltage signals
Data Source
AI summary
An electrical circuit device includes a signal bus comprising a plurality of parallel signal paths and a calibration circuit, operatively coupled with the signal bus. The calibration circuit can perform operations including determining a representative duty cycle for a plurality of signals transferred via the plurality of parallel signal paths, the plurality of signals comprising a plurality of duty cycles and comparing the representative duty cycle for the plurality of signals transferred via the plurality of parallel signal paths to a reference value to determine a comparison result. The calibration circuit can perform further operations including adjusting, based on the comparison result, a trim value associated with the plurality of duty cycles of the plurality of signals to compensate for distortion in the plurality of duty cycles and calibrating the plurality of duty cycles of the plurality of signals using the adjusted trim value.