Touch Analog Front-End Circuit With Low-Voltage Accumulation
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Solution Overview
Problem
Conventional touch display devices have high power consumption due to the voltage range requirements of touch analog front-end circuits, which is a significant drawback in terms of energy efficiency.
Innovation Solution
The touch analog front-end circuit incorporates a current conveyor and an accumulator, where the accumulator operates on a lower second voltage, reducing power consumption by utilizing a voltage lower than that of the current conveyor, thereby minimizing overall power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch analog front-end circuit uses a higher voltage range to process touch sensing signals, then the signal processing capability is improved, but the power consumption increases
Solution Approach 1:
The touch analog front-end circuit is divided into two functional modules with different voltage requirements: the current conveyor module operates at a first voltage level to process touch sensing signals, while the accumulator module operates at a lower second voltage level for accumulation operations. This segmentation allows each module to use the minimum necessary voltage for its function, reducing overall power consumption while maintaining signal processing capability.
Solution Approach 2:
Different voltage levels are applied to different parts of the circuit based on their specific functional requirements. The current conveyor receives a first voltage sufficient for signal processing, while the accumulator receives a lower second voltage sufficient only for accumulation operations. This local quality approach ensures that no part of the circuit uses more voltage than necessary, optimizing the balance between performance and power consumption.
2Use of energy by moving object
If the accumulator operates at a lower voltage, then power consumption is reduced, but the voltage range for signal processing is limited
Solution Approach 1:
The circuit functionality is segmented into voltage-sensitive signal processing (current conveyor at first voltage) and voltage-insensitive accumulation operations (accumulator at second voltage). This segmentation allows the accumulator to operate at lower voltage for power savings while the main signal processing path maintains higher voltage for full adaptability and signal range.
Solution Approach 2:
The current conveyor acts as an intermediary that converts touch sensing signals into current signals that can be processed by the accumulator at lower voltage. This intermediary conversion allows the signal to maintain its information content while being processed in a lower voltage domain, thus preserving adaptability while reducing power consumption.
Data Source
AI summary
A touch analog front-end circuit includes a current conveyor and an accumulator. The current conveyor receives a first voltage as an operation voltage, and generates a current signal according to a touch sensing signal received from a touch display panel. The accumulator is coupled to the current conveyor, receives a second voltage as an operation voltage, and generates an accumulating result according to the current signal and a reference voltage. The first voltage is higher than the second voltage.