CCD Shift Register Clock Line Arrangement for Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-resolution solid-state image sensing devices face challenges in achieving high frame rates due to decreased transfer efficiency, increased power consumption, and heat generation, primarily caused by crosstalk among clock signal lines in CCD horizontal shift registers, especially during multiple phase driving methods.
Innovation Solution
The CCD shift register is designed with n clock signal lines that can switch between m-phase and m′-phase driving, with n/m clock signal lines supplied in-phase at m-phase driving and strategically arranged to prevent crosstalk, using a semiconductor substrate and polysilicon electrode layers to reduce capacitive coupling between adjacent clock signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple clock signal lines are disposed adjacently in parallel to provide clocks to transfer electrodes, then the horizontal shift register can be driven by multiple phase clock signals, but crosstalk occurs among the clock signal lines which decreases transfer efficiency
Solution Approach 1:
The clock signal lines are segmented into multiple groups based on their phase relationships. Lines supplying in-phase clocks are grouped together, while lines supplying out-of-phase clocks are separated. This segmentation reduces crosstalk between lines with different phases while maintaining the ability to provide multiple phase driving signals to the transfer electrodes.
Solution Approach 2:
Different spatial arrangements are applied to different groups of clock signal lines based on their phase relationships. Lines that are in-phase are disposed adjacently to minimize crosstalk, while lines that are out-of-phase are separated by intermediate lines. This local optimization of line arrangement improves transfer efficiency while preserving multiple phase driving capability.
2Reliability
If clock signal lines are arranged to reduce crosstalk, then transfer efficiency improves, but the layout complexity increases
Solution Approach 1:
The invention changes the arrangement parameter of clock signal lines from a uniform parallel layout to a phase-based grouped layout. By organizing lines according to their phase relationships (in-phase lines adjacent, out-of-phase lines separated), the layout complexity is managed systematically while achieving reduced crosstalk and improved transfer efficiency.
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 arrangement effectively reduces crosstalk among clock signal lines, enhancing transfer efficiency and minimizing power consumption and heat generation, thereby improving frame rates for both still-picture and motion-picture photographing.
Implementation Method 1
capacitive coupling among them
Implementation Method 2
the fringe electric field between adjacent transfer electrodes
Data Source
AI summary
A CCD shift register capable of switching between two-phase driving and three-phase driving in which crosstalk among clock signal lines is reduced and a decrease in transfer efficiency is prevented. Transfer electrodes disposed at regular intervals along a channel region are supplied with clock signals through clock signal lines. Three pairs of clock signal lines that are supplied with an in-phase clock signal at three-phase driving are disposed next to each other. One pair of odd-numbered clock signal lines supplied with an in-phase clock signal at two-phase driving is disposed next to each other, and one pair of even-numbered clock signal lines supplied with an in-phase clock signal at two-phase driving is disposed next to each other.