Capacitive Coupling Component for Clock Feedthrough Compensation
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Solution Overview
Problem
The existing voltage source circuits in electronic devices suffer from clock feedthrough effects, which degrade control accuracy and are mitigated by increasing the size of scan transistors, but this approach complicates layout and can exacerbate the feedthrough issue.
Innovation Solution
Incorporating a capacitive coupling component connected to the control terminal of the driving transistor, which compensates for the clock feedthrough effect by adjusting the node voltage, thereby maintaining data voltage stability during scan transistor transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the size of the storage capacitor is increased to maintain data voltage and reduce clock feedthrough impact, then the data voltage stability is improved, but the layout difficulty increases and scan transistor size must be increased
Solution Approach 1:
A compensation transistor is introduced as an intermediary component to counteract the clock feedthrough effect. The compensation transistor is configured to generate a compensating signal that offsets the unwanted voltage shift caused by clock feedthrough, thereby maintaining data voltage stability without requiring larger capacitors or transistors
Solution Approach 2:
The invention changes the operational parameters of the scan transistor by controlling its gate voltage dynamically. During the scan phase, the gate voltage is adjusted to minimize clock feedthrough effect, while during the hold phase, it maintains proper switching function. This parameter modulation allows smaller transistor sizes while achieving the same voltage stability
2Productivity
If the size of scan transistors is increased to charge the storage capacitor faster, then the scan time constraint is satisfied, but the clock feedthrough effect becomes larger
Solution Approach 1:
The invention converts the harmful clock feedthrough effect into a beneficial compensation mechanism. The compensation transistor is designed to generate a signal that mirrors the clock feedthrough effect but with opposite polarity, thereby canceling out the harmful voltage shift. This allows the use of smaller scan transistors that can scan faster without exacerbating the feedthrough problem
Solution Approach 2:
The compensation transistor applies a preliminary counteracting action before the clock feedthrough effect fully impacts the data voltage. By anticipating the voltage shift and applying an equal and opposite compensation signal, the system prevents the harmful effect from occurring in the first place, maintaining voltage stability with smaller transistor sizes
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 solution effectively reduces or eliminates the clock feedthrough effect, improving control accuracy and simplifying the layout by maintaining data voltage stability without the need for larger scan transistors.
Implementation Method 1
a first capacitive coupling component. The first terminal of the first capacitive coupling component is electrically connected to a control terminal of the driving transistor
Data Source
AI summary
An electronic device is provided. The electronic device includes a first scan transistor, a driving transistor, an electronic component and a first capacitive coupling component. The driving transistor is electrically connected to the first scan transistor. The electronic component is electrically connected to the driving transistor. The first terminal of the first capacitive coupling component is electrically connected to a control terminal of the driving transistor.