Current Detector Circuit for Low Voltage Non-Volatile Memory
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Solution Overview
Problem
Current detection circuits in non-volatile memories face challenges in maintaining high detection speed and low electrical consumption, especially at supply voltages lower than 1 V, as they tend to deteriorate in reading speed and increase energy consumption.
Innovation Solution
A current detection circuit comprising a bias stage, measurement stage, and output stage, where a fraction of the bias current is transmitted to the output stage, forming current mirrors to maintain a constant voltage at the measurement node, independent of the power supply voltage, and comparing the current difference to determine the measured current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the supply voltage is reduced below 1 V to lower electrical consumption, then energy efficiency is improved, but detection speed deteriorates
Solution Approach 1:
The current detection circuit is divided into distinct functional stages: a bias stage generating reference current, a measurement stage with current mirror transistors, and an output stage. This segmentation allows each stage to be optimized independently for low-voltage operation while maintaining overall detection speed performance.
Solution Approach 2:
The circuit employs current mirror transistors with specific width-to-length ratio relationships to maintain constant current ratios independent of supply voltage variations. By carefully designing the transistor dimensions and biasing conditions, the circuit achieves stable operation across a wide supply voltage range including below 1 V, resolving the contradiction between low voltage operation and detection speed.
2Use of energy by moving object
If the supply voltage is reduced below 1 V to improve energy efficiency, then electrical consumption is reduced, but reading speed deteriorates
Solution Approach 1:
The measurement stage incorporates a feedback mechanism where the current mirror transistors automatically adjust their operation based on voltage variations. The feedback path through the current mirror arrangement maintains stable current ratios and ensures consistent detection performance across different supply voltages, including low-voltage conditions.
Solution Approach 2:
The circuit is designed with dynamic biasing that adapts to supply voltage changes. The bias stage generates reference current that dynamically adjusts with supply voltage, and the measurement stage transistors dynamically mirror this current while maintaining accurate measurement ratios, enabling fast reading speeds even at supply voltages below 1 V.
3Device complexity
If a conventional current detection circuit is used, then the circuit structure is simple, but performance deteriorates at supply voltages below 1 V
Solution Approach 1:
The current detection circuit is designed with universal functionality that works reliably across a wide supply voltage range including below 1 V. The current mirror transistors and bias stage configuration provide multi-functional operation that maintains accurate current measurement and fast detection speeds regardless of supply voltage level, making the circuit adaptable to various operating conditions.
Solution Approach 2:
The circuit employs current mirror transistors that create equipotential conditions for current ratio maintenance. By designing the transistor pairs with matched characteristics and appropriate biasing, the circuit maintains stable current ratios and reliable operation across different supply voltages, ensuring performance stability without requiring complex voltage-regulation mechanisms.
Data Source
AI summary
The disclosure relates to a method for detecting a current comprising: generating a bias current, transmitting the bias current to a feedback stage and a measurement stage connected to the measurement node receiving a current to be measured, slaving a voltage to the measurement node at a constant value by the measurement and feedback stages, transmitting to an output stage, a current circulating in the measurement stage, which depends on the bias current and the current to be measured, and converting a current circulating in the output stage into a voltage.