Data Transmission Circuit RC Delay Compensation
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Solution Overview
Problem
The increasing fabrication size of image sensors leads to adverse effects on operating speed due to variable resistance-capacitance (RC) delay times, which differ between memory cells and affect data communication, especially when retrieving image data from semiconductor memory devices.
Innovation Solution
A data transmission circuit is designed with positive and negative data transmission lines, data signal driving units, and pull-up devices to reduce differences in RC delay times by generating adjusted data and pull-up signals based on data transmission distances, ensuring consistent signal strength and propagation across the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the fabrication size of image sensors is increased, then the image sensor can store and process more image data, but the operating speed is adversely affected due to variable RC delay times
Solution Approach 1:
The patent applies local quality by adjusting the driving capability of each data signal driving unit based on its specific location along the transmission line. Memory cells farther from the data output unit are assigned driving units with stronger driving capability (lower resistance) to compensate for the longer RC delay time, while nearer memory cells use driving units with weaker driving capability. This localized adaptation ensures uniform data transmission timing across the entire array despite varying distances.
Solution Approach 2:
The patent changes the resistance parameter of the data signal driving units based on their position in the transmission line. By adjusting the resistance values to compensate for distance-related RC delays, the system achieves uniform data transmission timing. This parameter adjustment allows larger sensor arrays to maintain high operating speeds by counteracting the increasing RC delay effects.
2Area of stationary object
If memory cells are disposed at different distances from the data output unit, then the image sensor array can be expanded, but variable RC delay times cause inconsistent data communication timing
Solution Approach 1:
The patent implements local quality by assigning different driving capabilities to data signal driving units based on their specific positions. Memory cells located farther from the data output unit are connected to driving units with optimized (lower) resistance values to compensate for the increased RC delay, ensuring that all data signals arrive at the data output unit with consistent timing regardless of their origin location.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and setting the optimal resistance values for each data signal driving unit before the sensor operates. The resistance of each driving unit is determined in advance based on its distance from the data output unit, allowing the system to proactively compensate for RC delay variations and achieve uniform data transmission timing across the entire array.
3Quantity of substance
If data is transmitted over long distances within the image sensor, then more memory cells can be included, but RC delay times increase and affect communication efficiency
Solution Approach 1:
The patent applies local quality by optimizing the driving capability of each data signal driving unit according to its specific transmission distance. Memory cells requiring longer transmission distances are served by driving units with lower resistance values, which reduce the RC delay time and compensate for the extended transmission path, thereby maintaining efficient data communication across the entire sensor array.
Solution Approach 2:
The patent changes the resistance parameter of data signal driving units based on transmission distance requirements. By adjusting resistance values to inversely correlate with distance (longer distances receive lower resistance), the system minimizes RC delay times for long-distance transmissions, enabling efficient data communication across expanded sensor arrays with greater numbers of memory cells.
Data Source
AI summary
A data transmission circuit includes a data output unit (DOU) connected to a positive data transmission line and a negative data transmission line. The DOU generates a recovered data signal based on data signals communicated via the positive and negative data transmission lines. Data signal driving units are respectively connected at different points along the positive and negative data transmission lines, where each data signal driving unit generates and provides a positive data signal and a negative data signal based on a data input signal and a data transmission distance between the data signal driving unit and the data output unit.