Anti-fuse Sensing Circuit Power-on Initialization
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Solution Overview
Problem
In electronic circuits, particularly in DRAM chips, the increasing number of anti-fuses leads to parasitic capacitance, causing the control voltage to be in an unknown state during the power-on transient period, which can result in unexpected changes in the resistance state of anti-fuses due to coupling noise.
Innovation Solution
An anti-fuse sensing device is introduced, comprising an anti-fuse sensing circuit, a voltage generating circuit, and a power-on detection circuit. The power-on detection circuit provides an initialization voltage to the control terminal of the anti-fuse sensing circuit during the power-on transient period to maintain a known voltage level, preventing unexpected changes, and stops providing this voltage once the voltage generating circuit is ready.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of anti-fuses is increased to latch more information, then the functionality and capacity of the circuit is improved, but the parasitic capacitance of the transmission path increases, causing the control voltage to be in an unknown state during power-on transient period
Solution Approach 1:
The power-on detection circuit detects the power-on transient period and provides an initialization voltage to the control terminal in advance, before the voltage generating circuit is ready. This preliminary action ensures the control terminal has a known voltage level during the transient period, preventing unexpected changes in anti-fuse resistance states.
Solution Approach 2:
The power-on detection circuit acts as an intermediary between the power source and the control terminal. It temporarily provides an initialization voltage through an output terminal coupled to the control terminal, mediating the voltage transition during power-on and eliminating the harmful effect of parasitic capacitance coupling noise.
2Device complexity
If the control voltage is provided during power-on transient period without initialization, then the device complexity is reduced, but unexpected changes in resistance state of anti-fuses occur due to coupling noise
Solution Approach 1:
The power-on detection circuit automatically detects the power-on transient period and self-adjusts to provide the initialization voltage without external intervention. It monitors the power-on state and autonomously activates the initialization voltage output, then stops providing it when the voltage generating circuit is ready, ensuring reliable operation without adding complex external control mechanisms.
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 ensures that the voltage level of the control terminal remains stable and known during the power-on transient period, preventing unexpected changes in the anti-fuse resistance states and ensuring accurate sensing after the power is fully on.
Implementation Method 1
As the number of anti-fuses increases, the parasitic capacitance of the transmission path of the control voltage V11 increases. When the power is turned on, that is, during a power-on transient period, the output of the voltage generating circuit 110 is not ready, so that the control voltage V11 is coupled by the parasitic capacitance to an unexpected level (coupling noise).
Data Source
AI summary
An anti-fuse sensing device and an operation method thereof are provided. The anti-fuse sensing device includes an anti-fuse sensing circuit, a voltage generating circuit, and a power-on detection circuit. During a power-on transient period of the voltage generating circuit, the power-on detection circuit provides an initialization voltage to a control terminal of the anti-fuse sensing circuit to prevent a voltage level of the control terminal of the anti-fuse sensing circuit from being in an unknown state. After the power-on transient period ends, the voltage generating circuit provides a control voltage to the control terminal of the anti-fuse sensing circuit. The anti-fuse sensing circuit senses a resistance state of an anti-fuse based on the control voltage. During the period when the voltage generating circuit provides the control voltage, the power-on detection circuit stops providing the initialization voltage to the control terminal of the anti-fuse sensing circuit.