Semiconductor Integrated Circuit Voltage Stabilization Switch
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Solution Overview
Problem
Existing semiconductor integrated circuits face challenges in maintaining stable internal voltages over long periods, leading to voltage variations that affect the reliability and operation speed, particularly in magnetic random access memory (MRAM) where high precision is required for write currents.
Innovation Solution
Incorporating a stabilization switch between the voltage generating circuit and the stabilization capacitance, which is turned off during the activation of the function circuit and turned on after deactivation, preventing current flow and thus minimizing voltage variation accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the output of the voltage generating circuit is connected to one end of a stabilization capacitance to minimize voltage variation, then the voltage stability is improved, but the voltage variation accumulates over time leading to long-term instability
Solution Approach 1:
The patent applies periodic action by controlling the switch to turn on and off at specific intervals. The switch is turned off when the function circuit is activated and turned on when the function circuit is deactivated, creating a periodic control pattern that prevents continuous current flow and subsequent voltage variation accumulation over time.
Solution Approach 2:
The patent introduces a switch as an intermediary component between the voltage generating circuit and the stabilization capacitance. This switch acts as a mediator that controls the current flow, allowing the system to benefit from voltage stabilization while preventing the accumulation of voltage variations by selectively disconnecting the capacitance during function circuit activation.
2Stability of the object's composition
If the switch is kept on to maintain voltage stabilization, then voltage variation is minimized, but current continues to flow causing voltage variation accumulation
Solution Approach 1:
The switch is controlled to operate periodically rather than remaining continuously on. It turns off during function circuit activation and turns on during deactivation, creating a rhythmic on-off pattern that maintains voltage stability while preventing harmful current flow accumulation that would compromise long-term reliability.
Solution Approach 2:
The patent extracts or removes the harmful current flow path by turning off the switch during function circuit activation. This selectively removes the problematic current flow that causes voltage variation accumulation while maintaining the beneficial voltage stabilization effect when the switch is on.
3Reliability
If the switch is turned off during function circuit activation, then voltage variation accumulation is prevented, but voltage stabilization is reduced
Solution Approach 1:
The switch operates periodically, being off during function circuit activation (preventing voltage variation accumulation) and on during function circuit deactivation (providing voltage stabilization). This periodic switching pattern balances both requirements by providing stabilization at appropriate intervals without causing harmful continuous current flow.
Solution Approach 2:
The switch is turned off in advance before the function circuit is activated, preventing current flow and voltage variation accumulation before it can occur. This preliminary action ensures that when the function circuit operates, no harmful current flow is taking place, while the switch can be turned on afterward to restore voltage stabilization.
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 stabilizes the internal voltage for extended periods, enhancing the reliability and operation speed of semiconductor integrated circuits, particularly in MRAM applications by ensuring stable write currents.
Implementation Method 1
the output of the voltage generating circuit is typically connected to one end of a stabilization capacitance
Implementation Method 2
The switch is turned off at a time simultaneous with a first time at which the function circuit is activated, or at a time previous to the first time by a predetermined time
Data Source
AI summary
A semiconductor integrated circuit is provided that can prevent an internal voltage from the voltage generating circuit from varying during a long term. The semiconductor integrated circuit of the present invention includes a voltage generating circuit configured to generate a reference voltage; a function circuit configured to operate by using the reference voltage; a first capacitance connected to a first node between the voltage generating circuit and the function circuit; and a switch provided between the voltage generating circuit and the first node. The switch is in a turned-off state at least for a period during which the function circuit is in an activated state.