Level-Shifted Sensing Circuit for Low-Power High-Voltage Detection
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Solution Overview
Problem
Traditional sense amplifiers consume high energy due to differential sensing, especially when dealing with high voltage signals, as they require high voltage level shifters and drivers, leading to increased energy consumption.
Innovation Solution
A sensing circuit that shifts high voltage analog signals to a low voltage domain using a level shifter, such as a capacitor, allowing the sense amplifier to operate in the low voltage domain without the need for high voltage components, thereby reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differential sensing is used to improve measurement precision, then sensing accuracy is improved, but energy consumption increases
Solution Approach 1:
A level shifter circuit is introduced as an intermediary component between the high-voltage sensing node and the low-voltage sense amplifier. This mediator converts the high-voltage differential signal to a low-voltage single-ended signal, allowing the sense amplifier to operate at low voltage while still accurately sensing the original high-voltage signal through the level shifting transformation.
2Measurement precision
If high voltage level shifters and drivers are used to handle high voltage signals, then signal detection capability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The level shifter serves as a mediator that isolates the high-voltage domain from the low-voltage sense amplifier domain. By using this intermediary circuit, the system avoids the need for complex high-voltage drivers and high-voltage tolerant sense amplifiers, thereby reducing overall device complexity while maintaining signal detection capability.
Solution Approach 2:
The sensing system is segmented into two distinct voltage domains: a high-voltage domain for signal acquisition and a low-voltage domain for signal processing. The level shifter acts as the interface between these segmented domains, allowing each part to be optimized independently - the high-voltage side for signal detection and the low-voltage side for low-power operation.
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 significantly reduces energy consumption by eliminating the need for high voltage level shifters and drivers, achieving lower power usage for sensing operations while maintaining accurate signal detection.
Implementation Method 1
The level shifter comprises a capacitor
Data Source
AI summary
A sensing circuit for sensing an analog signal includes a level shifter that shifts the analog signal from a high voltage domain to a low voltage domain. The signal originates from the high voltage domain, and is passed to the low voltage domain through the level shifter. A source line provides the analog signal, which can be selectively switched into a sense amplifier circuit. The sense amplifier is in the low voltage domain and generates a digital output to represent the sensed analog signal.